Adding upstream version 2.6.12.upstream/2.6.12upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 4318 insertions, 0 deletions

diff --git a/src/mux_fcgi.c b/src/mux_fcgi.c
new file mode 100644
index 0000000..2c417dd
--- /dev/null
+++ b/src/mux_fcgi.c
@@ -0,0 +1,4318 @@
+/*
+ * FastCGI mux-demux for connections
+ *
+ * Copyright (C) 2019 HAProxy Technologies, Christopher Faulet <cfaulet@haproxy.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <import/ist.h>
+#include <import/eb32tree.h>
+#include <import/ebmbtree.h>
+
+#include <haproxy/api.h>
+#include <haproxy/cfgparse.h>
+#include <haproxy/connection.h>
+#include <haproxy/dynbuf.h>
+#include <haproxy/errors.h>
+#include <haproxy/fcgi-app.h>
+#include <haproxy/fcgi.h>
+#include <haproxy/h1.h>
+#include <haproxy/h1_htx.h>
+#include <haproxy/http_htx.h>
+#include <haproxy/htx.h>
+#include <haproxy/list.h>
+#include <haproxy/log.h>
+#include <haproxy/net_helper.h>
+#include <haproxy/proxy.h>
+#include <haproxy/regex.h>
+#include <haproxy/sc_strm.h>
+#include <haproxy/session-t.h>
+#include <haproxy/stconn.h>
+#include <haproxy/stream.h>
+#include <haproxy/trace.h>
+#include <haproxy/version.h>
+
+
+/* FCGI Connection flags (32 bits) */
+#define FCGI_CF_NONE           0x00000000
+
+/* Flags indicating why writing to the mux is blockes */
+#define FCGI_CF_MUX_MALLOC      0x00000001 /* mux is blocked on lack connection's mux buffer */
+#define FCGI_CF_MUX_MFULL       0x00000002 /* mux is blocked on connection's mux buffer full */
+#define FCGI_CF_MUX_BLOCK_ANY   0x00000003 /* mux is blocked on connection's mux buffer full */
+
+/* Flags indicating why writing to the demux is blocked.
+ * The first two ones directly affect the ability for the mux to receive data
+ * from the connection. The other ones affect the mux's ability to demux
+ * received data.
+ */
+#define FCGI_CF_DEM_DALLOC      0x00000004  /* demux blocked on lack of connection's demux buffer */
+#define FCGI_CF_DEM_DFULL       0x00000008  /* demux blocked on connection's demux buffer full */
+#define FCGI_CF_DEM_MROOM       0x00000010  /* demux blocked on lack of room in mux buffer */
+#define FCGI_CF_DEM_SALLOC      0x00000020  /* demux blocked on lack of stream's rx buffer */
+#define FCGI_CF_DEM_SFULL       0x00000040  /* demux blocked on stream request buffer full */
+#define FCGI_CF_DEM_TOOMANY     0x00000080  /* demux blocked waiting for some stream connectors to leave */
+#define FCGI_CF_DEM_BLOCK_ANY   0x000000F0  /* aggregate of the demux flags above except DALLOC/DFULL */
+
+/* Other flags */
+#define FCGI_CF_MPXS_CONNS      0x00000100  /* connection multiplexing is supported */
+#define FCGI_CF_ABRTS_SENT      0x00000200  /* a record ABORT was successfully sent to all active streams */
+#define FCGI_CF_ABRTS_FAILED    0x00000400  /* failed to abort processing of all streams */
+#define FCGI_CF_WAIT_FOR_HS     0x00000800  /* We did check that at least a stream was waiting for handshake */
+#define FCGI_CF_KEEP_CONN       0x00001000  /* HAProxy is responsible to close the connection */
+#define FCGI_CF_GET_VALUES      0x00002000  /* retrieve settings */
+
+/* FCGI connection state (fcgi_conn->state) */
+enum fcgi_conn_st {
+	FCGI_CS_INIT = 0,    /* init done, waiting for sending GET_VALUES record */
+	FCGI_CS_SETTINGS,    /* GET_VALUES sent, waiting for the GET_VALUES_RESULT record */
+	FCGI_CS_RECORD_H,    /* GET_VALUES_RESULT received, waiting for a record header */
+	FCGI_CS_RECORD_D,    /* Record header OK, waiting for a record data */
+	FCGI_CS_RECORD_P,    /* Record processed, remains the padding */
+	FCGI_CS_CLOSED,      /* abort requests if necessary and  close the connection ASAP */
+	FCGI_CS_ENTRIES
+} __attribute__((packed));
+
+/* 32 buffers: one for the ring's root, rest for the mbuf itself */
+#define FCGI_C_MBUF_CNT 32
+
+/* Size for a record header (also size of empty record) */
+#define FCGI_RECORD_HEADER_SZ 8
+
+/* FCGI connection descriptor */
+struct fcgi_conn {
+	struct connection *conn;
+
+	enum fcgi_conn_st state;              /* FCGI connection state */
+	int16_t max_id;                       /* highest ID known on this connection, <0 before mgmt records */
+	uint32_t streams_limit;               /* maximum number of concurrent streams the peer supports */
+	uint32_t flags;                      /* Connection flags: FCGI_CF_* */
+
+	int16_t  dsi;                        /* dmux stream ID (<0 = idle ) */
+	uint16_t drl;                        /* demux record length (if dsi >= 0) */
+	uint8_t  drt;                        /* demux record type (if dsi >= 0) */
+	uint8_t  drp;                        /* demux record padding (if dsi >= 0) */
+
+	struct buffer dbuf;                  /* demux buffer */
+	struct buffer mbuf[FCGI_C_MBUF_CNT]; /* mux buffers (ring) */
+
+	int timeout;                         /* idle timeout duration in ticks */
+	int shut_timeout;                    /* idle timeout duration in ticks after shutdown */
+	unsigned int nb_streams;             /* number of streams in the tree */
+	unsigned int nb_sc;                  /* number of attached stream connectors */
+	unsigned int nb_reserved;            /* number of reserved streams */
+	unsigned int stream_cnt;             /* total number of streams seen */
+
+	struct proxy *proxy;                 /* the proxy this connection was created for */
+	struct fcgi_app *app;                /* FCGI application used by this mux */
+	struct task *task;                   /* timeout management task */
+	struct eb_root streams_by_id;        /* all active streams by their ID */
+
+	struct list send_list;               /* list of blocked streams requesting to send */
+
+	struct buffer_wait buf_wait;         /* Wait list for buffer allocation */
+	struct wait_event wait_event;        /* To be used if we're waiting for I/Os */
+};
+
+
+/* FCGI stream state, in fcgi_strm->state */
+enum fcgi_strm_st {
+	FCGI_SS_IDLE = 0,
+	FCGI_SS_OPEN,
+	FCGI_SS_HREM,     // half-closed(remote)
+	FCGI_SS_HLOC,     // half-closed(local)
+	FCGI_SS_ERROR,
+	FCGI_SS_CLOSED,
+	FCGI_SS_ENTRIES
+} __attribute__((packed));
+
+
+/* FCGI stream flags (32 bits) */
+#define FCGI_SF_NONE           0x00000000
+#define FCGI_SF_ES_RCVD        0x00000001 /* end-of-stream received (empty STDOUT or EDN_REQUEST record) */
+#define FCGI_SF_ES_SENT        0x00000002 /* end-of-stream sent (empty STDIN record) */
+#define FCGI_SF_EP_SENT        0x00000004 /* end-of-param sent (empty PARAMS  record) */
+#define FCGI_SF_ABRT_SENT      0x00000008 /* abort sent (ABORT_REQUEST record) */
+
+/* Stream flags indicating the reason the stream is blocked */
+#define FCGI_SF_BLK_MBUSY      0x00000010 /* blocked waiting for mux access (transient) */
+#define FCGI_SF_BLK_MROOM      0x00000020 /* blocked waiting for room in the mux */
+#define FCGI_SF_BLK_ANY        0x00000030 /* any of the reasons above */
+
+#define FCGI_SF_BEGIN_SENT     0x00000100  /* a BEGIN_REQUEST record was sent for this stream */
+#define FCGI_SF_OUTGOING_DATA  0x00000200  /* set whenever we've seen outgoing data */
+#define FCGI_SF_NOTIFIED       0x00000400  /* a paused stream was notified to try to send again */
+
+#define FCGI_SF_WANT_SHUTR     0x00001000  /* a stream couldn't shutr() (mux full/busy) */
+#define FCGI_SF_WANT_SHUTW     0x00002000  /* a stream couldn't shutw() (mux full/busy) */
+
+
+/* FCGI stream descriptor */
+struct fcgi_strm {
+	struct sedesc *sd;
+	struct session *sess;
+	struct fcgi_conn *fconn;
+
+	int32_t id;                   /* stream ID */
+
+	uint32_t flags;               /* Connection flags: FCGI_SF_* */
+	enum fcgi_strm_st state;      /* FCGI stream state */
+	int proto_status;             /* FCGI_PS_* */
+
+	struct h1m h1m;               /* response parser state for H1 */
+
+	struct buffer rxbuf;          /* receive buffer, always valid (buf_empty or real buffer) */
+
+	struct eb32_node by_id;       /* place in fcgi_conn's streams_by_id */
+	struct wait_event *subs;      /* Address of the wait_event the stream connector associated is waiting on */
+	struct list send_list;        /* To be used when adding in fcgi_conn->send_list */
+	struct tasklet *shut_tl;      /* deferred shutdown tasklet, to retry to close after we failed to by lack of space */
+};
+
+/* Flags representing all default FCGI parameters */
+#define FCGI_SP_CGI_GATEWAY    0x00000001
+#define FCGI_SP_DOC_ROOT       0x00000002
+#define FCGI_SP_SCRIPT_NAME    0x00000004
+#define FCGI_SP_PATH_INFO      0x00000008
+#define FCGI_SP_REQ_URI        0x00000010
+#define FCGI_SP_REQ_METH       0x00000020
+#define FCGI_SP_REQ_QS         0x00000040
+#define FCGI_SP_SRV_PORT       0x00000080
+#define FCGI_SP_SRV_PROTO      0x00000100
+#define FCGI_SP_SRV_NAME       0x00000200
+#define FCGI_SP_REM_ADDR       0x00000400
+#define FCGI_SP_REM_PORT       0x00000800
+#define FCGI_SP_SCRIPT_FILE    0x00001000
+#define FCGI_SP_PATH_TRANS     0x00002000
+#define FCGI_SP_CONT_LEN       0x00004000
+#define FCGI_SP_HTTPS          0x00008000
+#define FCGI_SP_SRV_SOFT       0x00010000
+#define FCGI_SP_MASK           0x0001FFFF
+#define FCGI_SP_URI_MASK       (FCGI_SP_SCRIPT_NAME|FCGI_SP_PATH_INFO|FCGI_SP_REQ_QS)
+
+/* FCGI parameters used when PARAMS record is sent */
+struct fcgi_strm_params {
+	uint32_t mask;
+	struct ist docroot;
+	struct ist scriptname;
+	struct ist pathinfo;
+	struct ist meth;
+	struct ist uri;
+	struct ist vsn;
+	struct ist qs;
+	struct ist srv_name;
+	struct ist srv_port;
+	struct ist rem_addr;
+	struct ist rem_port;
+	struct ist cont_len;
+	struct ist srv_soft;
+	int https;
+	struct buffer *p;
+};
+
+/* Maximum amount of data we're OK with re-aligning for buffer optimizations */
+#define MAX_DATA_REALIGN 1024
+
+/* trace source and events */
+static void fcgi_trace(enum trace_level level, uint64_t mask,
+		       const struct trace_source *src,
+		       const struct ist where, const struct ist func,
+		       const void *a1, const void *a2, const void *a3, const void *a4);
+
+/* The event representation is split like this :
+ *   fconn - internal FCGI connection
+ *   fstrm - internal FCGI stream
+ *   strm  - application layer
+ *   rx    - data receipt
+ *   tx    - data transmission
+ *   rsp   - response parsing
+ */
+static const struct trace_event fcgi_trace_events[] = {
+#define           FCGI_EV_FCONN_NEW     (1ULL <<  0)
+	{ .mask = FCGI_EV_FCONN_NEW,    .name = "fconn_new",        .desc = "new FCGI connection" },
+#define           FCGI_EV_FCONN_RECV    (1ULL <<  1)
+	{ .mask = FCGI_EV_FCONN_RECV,   .name = "fconn_recv",       .desc = "Rx on FCGI connection" },
+#define           FCGI_EV_FCONN_SEND    (1ULL <<  2)
+	{ .mask = FCGI_EV_FCONN_SEND,   .name = "fconn_send",       .desc = "Tx on FCGI connection" },
+#define           FCGI_EV_FCONN_BLK     (1ULL <<  3)
+	{ .mask = FCGI_EV_FCONN_BLK,    .name = "fconn_blk",        .desc = "FCGI connection blocked" },
+#define           FCGI_EV_FCONN_WAKE    (1ULL <<  4)
+	{ .mask = FCGI_EV_FCONN_WAKE,   .name = "fconn_wake",       .desc = "FCGI connection woken up" },
+#define           FCGI_EV_FCONN_END     (1ULL <<  5)
+	{ .mask = FCGI_EV_FCONN_END,    .name = "fconn_end",        .desc = "FCGI connection terminated" },
+#define           FCGI_EV_FCONN_ERR     (1ULL <<  6)
+	{ .mask = FCGI_EV_FCONN_ERR,    .name = "fconn_err",        .desc = "error on FCGI connection" },
+
+#define           FCGI_EV_RX_FHDR       (1ULL <<  7)
+	{ .mask = FCGI_EV_RX_FHDR,      .name = "rx_fhdr",          .desc = "FCGI record header received" },
+#define           FCGI_EV_RX_RECORD     (1ULL <<  8)
+	{ .mask = FCGI_EV_RX_RECORD,    .name = "rx_record",        .desc = "receipt of any FCGI record" },
+#define           FCGI_EV_RX_EOI        (1ULL <<  9)
+	{ .mask = FCGI_EV_RX_EOI,       .name = "rx_eoi",           .desc = "receipt of end of FCGI input" },
+#define           FCGI_EV_RX_GETVAL     (1ULL << 10)
+	{ .mask = FCGI_EV_RX_GETVAL,    .name = "rx_get_values",    .desc = "receipt of FCGI GET_VALUES_RESULT record" },
+#define           FCGI_EV_RX_STDOUT     (1ULL << 11)
+	{ .mask = FCGI_EV_RX_STDOUT,    .name = "rx_stdout",        .desc = "receipt of FCGI STDOUT record" },
+#define           FCGI_EV_RX_STDERR     (1ULL << 12)
+	{ .mask = FCGI_EV_RX_STDERR,    .name = "rx_stderr",        .desc = "receipt of FCGI STDERR record" },
+#define           FCGI_EV_RX_ENDREQ     (1ULL << 13)
+	{ .mask = FCGI_EV_RX_ENDREQ,    .name = "rx_end_req",       .desc = "receipt of FCGI END_REQUEST record" },
+
+#define           FCGI_EV_TX_RECORD     (1ULL << 14)
+	{ .mask = FCGI_EV_TX_RECORD,    .name = "tx_record",        .desc = "transmission of any FCGI record" },
+#define           FCGI_EV_TX_EOI        (1ULL << 15)
+	{ .mask = FCGI_EV_TX_EOI,       .name = "tx_eoi",           .desc = "transmission of FCGI end of input" },
+#define           FCGI_EV_TX_BEGREQ     (1ULL << 16)
+	{ .mask = FCGI_EV_TX_BEGREQ,    .name = "tx_begin_request", .desc = "transmission of FCGI BEGIN_REQUEST record" },
+#define           FCGI_EV_TX_GETVAL     (1ULL << 17)
+	{ .mask = FCGI_EV_TX_GETVAL,    .name = "tx_get_values",    .desc = "transmission of FCGI GET_VALUES record" },
+#define           FCGI_EV_TX_PARAMS     (1ULL << 18)
+	{ .mask = FCGI_EV_TX_PARAMS,    .name = "tx_params",        .desc = "transmission of FCGI PARAMS record" },
+#define           FCGI_EV_TX_STDIN      (1ULL << 19)
+	{ .mask = FCGI_EV_TX_STDIN,     .name = "tx_stding",        .desc = "transmission of FCGI STDIN record" },
+#define           FCGI_EV_TX_ABORT      (1ULL << 20)
+	{ .mask = FCGI_EV_TX_ABORT,     .name = "tx_abort",         .desc = "transmission of FCGI ABORT record" },
+
+#define           FCGI_EV_RSP_DATA      (1ULL << 21)
+	{ .mask = FCGI_EV_RSP_DATA,     .name = "rsp_data",         .desc = "parse any data of H1 response" },
+#define           FCGI_EV_RSP_EOM       (1ULL << 22)
+	{ .mask = FCGI_EV_RSP_EOM,      .name = "rsp_eom",          .desc = "reach the end of message of H1 response" },
+#define           FCGI_EV_RSP_HDRS      (1ULL << 23)
+	{ .mask = FCGI_EV_RSP_HDRS,     .name = "rsp_headers",      .desc = "parse headers of H1 response" },
+#define           FCGI_EV_RSP_BODY      (1ULL << 24)
+	{ .mask = FCGI_EV_RSP_BODY,     .name = "rsp_body",         .desc = "parse body part of H1 response" },
+#define           FCGI_EV_RSP_TLRS      (1ULL << 25)
+	{ .mask = FCGI_EV_RSP_TLRS,     .name = "rsp_trailerus",    .desc = "parse trailers of H1 response" },
+
+#define           FCGI_EV_FSTRM_NEW     (1ULL << 26)
+	{ .mask = FCGI_EV_FSTRM_NEW,    .name = "fstrm_new",        .desc = "new FCGI stream" },
+#define           FCGI_EV_FSTRM_BLK     (1ULL << 27)
+	{ .mask = FCGI_EV_FSTRM_BLK,    .name = "fstrm_blk",        .desc = "FCGI stream blocked" },
+#define           FCGI_EV_FSTRM_END     (1ULL << 28)
+	{ .mask = FCGI_EV_FSTRM_END,    .name = "fstrm_end",        .desc = "FCGI stream terminated" },
+#define           FCGI_EV_FSTRM_ERR     (1ULL << 29)
+	{ .mask = FCGI_EV_FSTRM_ERR,    .name = "fstrm_err",        .desc = "error on FCGI stream" },
+
+#define           FCGI_EV_STRM_NEW      (1ULL << 30)
+	{ .mask = FCGI_EV_STRM_NEW,     .name = "strm_new",         .desc = "app-layer stream creation" },
+#define           FCGI_EV_STRM_RECV     (1ULL << 31)
+	{ .mask = FCGI_EV_STRM_RECV,    .name = "strm_recv",        .desc = "receiving data for stream" },
+#define           FCGI_EV_STRM_SEND     (1ULL << 32)
+	{ .mask = FCGI_EV_STRM_SEND,    .name = "strm_send",        .desc = "sending data for stream" },
+#define           FCGI_EV_STRM_FULL     (1ULL << 33)
+	{ .mask = FCGI_EV_STRM_FULL,    .name = "strm_full",        .desc = "stream buffer full" },
+#define           FCGI_EV_STRM_WAKE     (1ULL << 34)
+	{ .mask = FCGI_EV_STRM_WAKE,    .name = "strm_wake",        .desc = "stream woken up" },
+#define           FCGI_EV_STRM_SHUT     (1ULL << 35)
+	{ .mask = FCGI_EV_STRM_SHUT,    .name = "strm_shut",        .desc = "stream shutdown" },
+#define           FCGI_EV_STRM_END      (1ULL << 36)
+	{ .mask = FCGI_EV_STRM_END,     .name = "strm_end",         .desc = "detaching app-layer stream" },
+#define           FCGI_EV_STRM_ERR      (1ULL << 37)
+	{ .mask = FCGI_EV_STRM_ERR,     .name = "strm_err",         .desc = "stream error" },
+
+	{ }
+};
+
+static const struct name_desc fcgi_trace_lockon_args[4] = {
+	/* arg1 */ { /* already used by the connection */ },
+	/* arg2 */ { .name="fstrm", .desc="FCGI stream" },
+	/* arg3 */ { },
+	/* arg4 */ { }
+};
+
+
+static const struct name_desc fcgi_trace_decoding[] = {
+#define FCGI_VERB_CLEAN    1
+	{ .name="clean",    .desc="only user-friendly stuff, generally suitable for level \"user\"" },
+#define FCGI_VERB_MINIMAL  2
+	{ .name="minimal",  .desc="report only fconn/fstrm state and flags, no real decoding" },
+#define FCGI_VERB_SIMPLE   3
+	{ .name="simple",   .desc="add request/response status line or htx info when available" },
+#define FCGI_VERB_ADVANCED 4
+	{ .name="advanced", .desc="add header fields or record decoding when available" },
+#define FCGI_VERB_COMPLETE 5
+	{ .name="complete", .desc="add full data dump when available" },
+	{ /* end */ }
+};
+
+static struct trace_source trace_fcgi __read_mostly = {
+	.name = IST("fcgi"),
+	.desc = "FastCGI multiplexer",
+	.arg_def = TRC_ARG1_CONN,  // TRACE()'s first argument is always a connection
+	.default_cb = fcgi_trace,
+	.known_events = fcgi_trace_events,
+	.lockon_args = fcgi_trace_lockon_args,
+	.decoding = fcgi_trace_decoding,
+	.report_events = ~0,  // report everything by default
+};
+
+#define TRACE_SOURCE &trace_fcgi
+INITCALL1(STG_REGISTER, trace_register_source, TRACE_SOURCE);
+
+/* FCGI connection and stream pools */
+DECLARE_STATIC_POOL(pool_head_fcgi_conn, "fcgi_conn", sizeof(struct fcgi_conn));
+DECLARE_STATIC_POOL(pool_head_fcgi_strm, "fcgi_strm", sizeof(struct fcgi_strm));
+
+struct task *fcgi_timeout_task(struct task *t, void *context, unsigned int state);
+static int fcgi_process(struct fcgi_conn *fconn);
+/* fcgi_io_cb is exported to see it resolved in "show fd" */
+struct task *fcgi_io_cb(struct task *t, void *ctx, unsigned int state);
+static inline struct fcgi_strm *fcgi_conn_st_by_id(struct fcgi_conn *fconn, int id);
+struct task *fcgi_deferred_shut(struct task *t, void *ctx, unsigned int state);
+static struct fcgi_strm *fcgi_stconn_new(struct fcgi_conn *fconn, struct stconn *sc, struct session *sess);
+static void fcgi_strm_notify_recv(struct fcgi_strm *fstrm);
+static void fcgi_strm_notify_send(struct fcgi_strm *fstrm);
+static void fcgi_strm_alert(struct fcgi_strm *fstrm);
+static int fcgi_strm_send_abort(struct fcgi_conn *fconn, struct fcgi_strm *fstrm);
+
+/* a dummy closed endpoint */
+static const struct sedesc closed_ep = {
+	.sc        = NULL,
+	.flags     = SE_FL_DETACHED,
+};
+
+/* a dmumy management stream */
+static const struct fcgi_strm *fcgi_mgmt_stream = &(const struct fcgi_strm){
+	.sd        = (struct sedesc*)&closed_ep,
+	.fconn     = NULL,
+	.state     = FCGI_SS_CLOSED,
+	.flags     = FCGI_SF_NONE,
+	.id        = 0,
+};
+
+/* and a dummy idle stream for use with any unknown stream */
+static const struct fcgi_strm *fcgi_unknown_stream = &(const struct fcgi_strm){
+	.sd        = (struct sedesc*)&closed_ep,
+	.fconn     = NULL,
+	.state     = FCGI_SS_IDLE,
+	.flags     = FCGI_SF_NONE,
+	.id        = 0,
+};
+
+/* returns a fconn state as an abbreviated 3-letter string, or "???" if unknown */
+static inline const char *fconn_st_to_str(enum fcgi_conn_st st)
+{
+	switch (st) {
+		case FCGI_CS_INIT     : return "INI";
+		case FCGI_CS_SETTINGS : return "STG";
+		case FCGI_CS_RECORD_H : return "RDH";
+		case FCGI_CS_RECORD_D : return "RDD";
+		case FCGI_CS_RECORD_P : return "RDP";
+		case FCGI_CS_CLOSED   : return "CLO";
+		default               : return "???";
+	}
+}
+
+/* returns a fstrm state as an abbreviated 3-letter string, or "???" if unknown */
+static inline const char *fstrm_st_to_str(enum fcgi_strm_st st)
+{
+	switch (st) {
+		case FCGI_SS_IDLE   : return "IDL";
+		case FCGI_SS_OPEN   : return "OPN";
+		case FCGI_SS_HREM   : return "RCL";
+		case FCGI_SS_HLOC   : return "HCL";
+		case FCGI_SS_ERROR  : return "ERR";
+		case FCGI_SS_CLOSED : return "CLO";
+		default             : return "???";
+	}
+}
+
+/* returns the stconn associated to the FCGI stream */
+static forceinline struct stconn *fcgi_strm_sc(const struct fcgi_strm *fstrm)
+{
+	return fstrm->sd->sc;
+}
+
+
+/* the FCGI traces always expect that arg1, if non-null, is of type connection
+ * (from which we can derive fconn), that arg2, if non-null, is of type fstrm,
+ * and that arg3, if non-null, is a htx for rx/tx headers.
+ */
+static void fcgi_trace(enum trace_level level, uint64_t mask, const struct trace_source *src,
+		       const struct ist where, const struct ist func,
+		       const void *a1, const void *a2, const void *a3, const void *a4)
+{
+	const struct connection *conn = a1;
+	struct fcgi_conn *fconn = conn ? conn->ctx : NULL;
+	const struct fcgi_strm *fstrm = a2;
+	const struct htx *htx = a3;
+	const size_t     *val = a4;
+
+	if (!fconn)
+		fconn = (fstrm ? fstrm->fconn : NULL);
+
+	if (!fconn || src->verbosity < FCGI_VERB_CLEAN)
+		return;
+
+	/* Display the response state if fstrm is defined */
+	if (fstrm)
+		chunk_appendf(&trace_buf, " [rsp:%s]", h1m_state_str(fstrm->h1m.state));
+
+	if (src->verbosity == FCGI_VERB_CLEAN)
+		return;
+
+	/* Display the value to the 4th argument (level > STATE) */
+	if (src->level > TRACE_LEVEL_STATE && val)
+		chunk_appendf(&trace_buf, " - VAL=%lu", (long)*val);
+
+	/* Display status-line if possible (verbosity > MINIMAL) */
+	if (src->verbosity > FCGI_VERB_MINIMAL && htx && htx_nbblks(htx)) {
+		const struct htx_blk *blk = __htx_get_head_blk(htx);
+		const struct htx_sl  *sl  = htx_get_blk_ptr(htx, blk);
+		enum htx_blk_type    type = htx_get_blk_type(blk);
+
+		if (type == HTX_BLK_REQ_SL || type == HTX_BLK_RES_SL)
+			chunk_appendf(&trace_buf, " - \"%.*s %.*s %.*s\"",
+				      HTX_SL_P1_LEN(sl), HTX_SL_P1_PTR(sl),
+				      HTX_SL_P2_LEN(sl), HTX_SL_P2_PTR(sl),
+				      HTX_SL_P3_LEN(sl), HTX_SL_P3_PTR(sl));
+	}
+
+	/* Display fconn info and, if defined, fstrm info */
+	chunk_appendf(&trace_buf, " - fconn=%p(%s,0x%08x)", fconn, fconn_st_to_str(fconn->state), fconn->flags);
+	if (fstrm)
+		chunk_appendf(&trace_buf, " fstrm=%p(%d,%s,0x%08x)", fstrm, fstrm->id, fstrm_st_to_str(fstrm->state), fstrm->flags);
+
+	if (!fstrm || fstrm->id <= 0)
+		chunk_appendf(&trace_buf, " dsi=%d", fconn->dsi);
+	if (fconn->dsi >= 0 && (mask & FCGI_EV_RX_FHDR))
+		chunk_appendf(&trace_buf, " drt=%s", fcgi_rt_str(fconn->drt));
+
+	if (src->verbosity == FCGI_VERB_MINIMAL)
+		return;
+
+	/* Display mbuf and dbuf info (level > USER & verbosity > SIMPLE) */
+	if (src->level > TRACE_LEVEL_USER) {
+		if (src->verbosity == FCGI_VERB_COMPLETE ||
+		    (src->verbosity == FCGI_VERB_ADVANCED && (mask & (FCGI_EV_FCONN_RECV|FCGI_EV_RX_RECORD))))
+			chunk_appendf(&trace_buf, " dbuf=%u@%p+%u/%u",
+				      (unsigned int)b_data(&fconn->dbuf), b_orig(&fconn->dbuf),
+				      (unsigned int)b_head_ofs(&fconn->dbuf), (unsigned int)b_size(&fconn->dbuf));
+		if (src->verbosity == FCGI_VERB_COMPLETE ||
+		    (src->verbosity == FCGI_VERB_ADVANCED && (mask & (FCGI_EV_FCONN_SEND|FCGI_EV_TX_RECORD)))) {
+			struct buffer *hmbuf = br_head(fconn->mbuf);
+			struct buffer *tmbuf = br_tail(fconn->mbuf);
+
+			chunk_appendf(&trace_buf, " .mbuf=[%u..%u|%u],h=[%u@%p+%u/%u],t=[%u@%p+%u/%u]",
+				      br_head_idx(fconn->mbuf), br_tail_idx(fconn->mbuf), br_size(fconn->mbuf),
+				      (unsigned int)b_data(hmbuf), b_orig(hmbuf),
+				      (unsigned int)b_head_ofs(hmbuf), (unsigned int)b_size(hmbuf),
+				      (unsigned int)b_data(tmbuf), b_orig(tmbuf),
+				      (unsigned int)b_head_ofs(tmbuf), (unsigned int)b_size(tmbuf));
+		}
+
+		if (fstrm && (src->verbosity == FCGI_VERB_COMPLETE ||
+			      (src->verbosity == FCGI_VERB_ADVANCED && (mask & (FCGI_EV_STRM_RECV|FCGI_EV_RSP_DATA)))))
+			chunk_appendf(&trace_buf, " rxbuf=%u@%p+%u/%u",
+				      (unsigned int)b_data(&fstrm->rxbuf), b_orig(&fstrm->rxbuf),
+				      (unsigned int)b_head_ofs(&fstrm->rxbuf), (unsigned int)b_size(&fstrm->rxbuf));
+	}
+
+	/* Display htx info if defined (level > USER) */
+	if (src->level > TRACE_LEVEL_USER && htx) {
+		int full = 0;
+
+		/* Full htx info (level > STATE && verbosity > SIMPLE) */
+		if (src->level > TRACE_LEVEL_STATE) {
+			if (src->verbosity == FCGI_VERB_COMPLETE)
+				full = 1;
+			else if (src->verbosity == FCGI_VERB_ADVANCED && (mask & (FCGI_EV_RSP_HDRS|FCGI_EV_TX_PARAMS)))
+				full = 1;
+		}
+
+		chunk_memcat(&trace_buf, "\n\t", 2);
+		htx_dump(&trace_buf, htx, full);
+	}
+}
+
+/*****************************************************/
+/* functions below are for dynamic buffer management */
+/*****************************************************/
+
+/* Indicates whether or not the we may call the fcgi_recv() function to attempt
+ * to receive data into the buffer and/or demux pending data. The condition is
+ * a bit complex due to some API limits for now. The rules are the following :
+ *   - if an error or a shutdown was detected on the connection and the buffer
+ *     is empty, we must not attempt to receive
+ *   - if the demux buf failed to be allocated, we must not try to receive and
+ *     we know there is nothing pending
+ *   - if no flag indicates a blocking condition, we may attempt to receive,
+ *     regardless of whether the demux buffer is full or not, so that only
+ *     de demux part decides whether or not to block. This is needed because
+ *     the connection API indeed prevents us from re-enabling receipt that is
+ *     already enabled in a polled state, so we must always immediately stop
+ *     as soon as the demux can't proceed so as never to hit an end of read
+ *     with data pending in the buffers.
+ *   - otherwise must may not attempt
+ */
+static inline int fcgi_recv_allowed(const struct fcgi_conn *fconn)
+{
+	if (b_data(&fconn->dbuf) == 0 &&
+	    (fconn->state == FCGI_CS_CLOSED ||
+	     fconn->conn->flags & CO_FL_ERROR ||
+	     conn_xprt_read0_pending(fconn->conn)))
+		return 0;
+
+	if (!(fconn->flags & FCGI_CF_DEM_DALLOC) &&
+	    !(fconn->flags & FCGI_CF_DEM_BLOCK_ANY))
+		return 1;
+
+	return 0;
+}
+
+/* Restarts reading on the connection if it was not enabled */
+static inline void fcgi_conn_restart_reading(const struct fcgi_conn *fconn, int consider_buffer)
+{
+	if (!fcgi_recv_allowed(fconn))
+		return;
+	if ((!consider_buffer || !b_data(&fconn->dbuf)) &&
+	    (fconn->wait_event.events & SUB_RETRY_RECV))
+		return;
+	tasklet_wakeup(fconn->wait_event.tasklet);
+}
+
+
+/* Tries to grab a buffer and to re-enable processing on mux <target>. The
+ * fcgi_conn flags are used to figure what buffer was requested. It returns 1 if
+ * the allocation succeeds, in which case the connection is woken up, or 0 if
+ * it's impossible to wake up and we prefer to be woken up later.
+ */
+static int fcgi_buf_available(void *target)
+{
+	struct fcgi_conn *fconn = target;
+	struct fcgi_strm *fstrm;
+
+	if ((fconn->flags & FCGI_CF_DEM_DALLOC) && b_alloc(&fconn->dbuf)) {
+		TRACE_STATE("unblocking fconn, dbuf allocated", FCGI_EV_FCONN_RECV|FCGI_EV_FCONN_BLK|FCGI_EV_FCONN_WAKE, fconn->conn);
+		fconn->flags &= ~FCGI_CF_DEM_DALLOC;
+		fcgi_conn_restart_reading(fconn, 1);
+		return 1;
+	}
+
+	if ((fconn->flags & FCGI_CF_MUX_MALLOC) && b_alloc(br_tail(fconn->mbuf))) {
+		TRACE_STATE("unblocking fconn, mbuf allocated", FCGI_EV_FCONN_SEND|FCGI_EV_FCONN_BLK|FCGI_EV_FCONN_WAKE, fconn->conn);
+		fconn->flags &= ~FCGI_CF_MUX_MALLOC;
+		if (fconn->flags & FCGI_CF_DEM_MROOM) {
+			fconn->flags &= ~FCGI_CF_DEM_MROOM;
+			fcgi_conn_restart_reading(fconn, 1);
+		}
+		return 1;
+	}
+
+	if ((fconn->flags & FCGI_CF_DEM_SALLOC) &&
+	    (fstrm = fcgi_conn_st_by_id(fconn, fconn->dsi)) && fcgi_strm_sc(fstrm) &&
+	    b_alloc(&fstrm->rxbuf)) {
+		TRACE_STATE("unblocking fstrm, rxbuf allocated", FCGI_EV_STRM_RECV|FCGI_EV_FSTRM_BLK|FCGI_EV_STRM_WAKE, fconn->conn, fstrm);
+		fconn->flags &= ~FCGI_CF_DEM_SALLOC;
+		fcgi_conn_restart_reading(fconn, 1);
+		fcgi_strm_notify_recv(fstrm);
+		return 1;
+	}
+
+	return 0;
+}
+
+static inline struct buffer *fcgi_get_buf(struct fcgi_conn *fconn, struct buffer *bptr)
+{
+	struct buffer *buf = NULL;
+
+	if (likely(!LIST_INLIST(&fconn->buf_wait.list)) &&
+	    unlikely((buf = b_alloc(bptr)) == NULL)) {
+		fconn->buf_wait.target = fconn;
+		fconn->buf_wait.wakeup_cb = fcgi_buf_available;
+		LIST_APPEND(&th_ctx->buffer_wq, &fconn->buf_wait.list);
+	}
+	return buf;
+}
+
+static inline void fcgi_release_buf(struct fcgi_conn *fconn, struct buffer *bptr)
+{
+	if (bptr->size) {
+		b_free(bptr);
+		offer_buffers(NULL, 1);
+	}
+}
+
+static inline void fcgi_release_mbuf(struct fcgi_conn *fconn)
+{
+	struct buffer *buf;
+	unsigned int count = 0;
+
+	while (b_size(buf = br_head_pick(fconn->mbuf))) {
+		b_free(buf);
+		count++;
+	}
+	if (count)
+		offer_buffers(NULL, count);
+}
+
+/* Returns the number of allocatable outgoing streams for the connection taking
+ * the number reserved streams into account.
+ */
+static inline int fcgi_streams_left(const struct fcgi_conn *fconn)
+{
+	int ret;
+
+	ret = (unsigned int)(0x7FFF - fconn->max_id) - fconn->nb_reserved - 1;
+	if (ret < 0)
+		ret = 0;
+	return ret;
+}
+
+/* Returns the number of streams in use on a connection to figure if it's
+ * idle or not. We check nb_sc and not nb_streams as the caller will want
+ * to know if it was the last one after a detach().
+ */
+static int fcgi_used_streams(struct connection *conn)
+{
+	struct fcgi_conn *fconn = conn->ctx;
+
+	return fconn->nb_sc;
+}
+
+/* Returns the number of concurrent streams available on the connection */
+static int fcgi_avail_streams(struct connection *conn)
+{
+	struct server *srv = objt_server(conn->target);
+	struct fcgi_conn *fconn = conn->ctx;
+	int ret1, ret2;
+
+	/* Don't open new stream if the connection is closed */
+	if (fconn->state == FCGI_CS_CLOSED)
+		return 0;
+
+	/* May be negative if this setting has changed */
+	ret1 = (fconn->streams_limit - fconn->nb_streams);
+
+	/* we must also consider the limit imposed by stream IDs */
+	ret2 = fcgi_streams_left(fconn);
+	ret1 = MIN(ret1, ret2);
+	if (ret1 > 0 && srv && srv->max_reuse >= 0) {
+		ret2 = ((fconn->stream_cnt <= srv->max_reuse) ? srv->max_reuse - fconn->stream_cnt + 1: 0);
+		ret1 = MIN(ret1, ret2);
+	}
+	return ret1;
+}
+
+/*****************************************************************/
+/* functions below are dedicated to the mux setup and management */
+/*****************************************************************/
+
+/* Initializes the mux once it's attached. Only outgoing connections are
+ * supported. So the context is already initialized before installing the
+ * mux. <input> is always used as Input buffer and may contain data. It is the
+ * caller responsibility to not reuse it anymore. Returns < 0 on error.
+ */
+static int fcgi_init(struct connection *conn, struct proxy *px, struct session *sess,
+		     struct buffer *input)
+{
+	struct fcgi_conn *fconn;
+	struct fcgi_strm *fstrm;
+	struct fcgi_app *app = get_px_fcgi_app(px);
+	struct task *t = NULL;
+	void *conn_ctx = conn->ctx;
+
+	TRACE_ENTER(FCGI_EV_FSTRM_NEW);
+
+	if (!app) {
+		TRACE_ERROR("No FCGI app found, don't create fconn", FCGI_EV_FCONN_NEW|FCGI_EV_FCONN_END|FCGI_EV_FCONN_ERR);
+		goto fail_conn;
+	}
+
+	fconn = pool_alloc(pool_head_fcgi_conn);
+	if (!fconn) {
+		TRACE_ERROR("fconn allocation failure", FCGI_EV_FCONN_NEW|FCGI_EV_FCONN_END|FCGI_EV_FCONN_ERR);
+		goto fail_conn;
+	}
+
+	fconn->shut_timeout = fconn->timeout = px->timeout.server;
+	if (tick_isset(px->timeout.serverfin))
+		fconn->shut_timeout = px->timeout.serverfin;
+
+	fconn->flags = FCGI_CF_NONE;
+
+	/* Retrieve useful info from the FCGI app */
+	if (app->flags & FCGI_APP_FL_KEEP_CONN)
+		fconn->flags |= FCGI_CF_KEEP_CONN;
+	if (app->flags & FCGI_APP_FL_GET_VALUES)
+		fconn->flags |= FCGI_CF_GET_VALUES;
+	if (app->flags & FCGI_APP_FL_MPXS_CONNS)
+		fconn->flags |= FCGI_CF_MPXS_CONNS;
+
+	fconn->proxy = px;
+	fconn->app = app;
+	fconn->task = NULL;
+	if (tick_isset(fconn->timeout)) {
+		t = task_new_here();
+		if (!t) {
+			TRACE_ERROR("fconn task allocation failure", FCGI_EV_FCONN_NEW|FCGI_EV_FCONN_END|FCGI_EV_FCONN_ERR);
+			goto fail;
+		}
+
+		fconn->task = t;
+		t->process = fcgi_timeout_task;
+		t->context = fconn;
+		t->expire = tick_add(now_ms, fconn->timeout);
+	}
+
+	fconn->wait_event.tasklet = tasklet_new();
+	if (!fconn->wait_event.tasklet)
+		goto fail;
+	fconn->wait_event.tasklet->process = fcgi_io_cb;
+	fconn->wait_event.tasklet->context = fconn;
+	fconn->wait_event.events = 0;
+
+	/* Initialise the context. */
+	fconn->state = FCGI_CS_INIT;
+	fconn->conn = conn;
+	fconn->streams_limit = app->maxreqs;
+	fconn->max_id = -1;
+	fconn->nb_streams = 0;
+	fconn->nb_sc = 0;
+	fconn->nb_reserved = 0;
+	fconn->stream_cnt = 0;
+
+	fconn->dbuf = *input;
+	fconn->dsi = -1;
+
+	br_init(fconn->mbuf, sizeof(fconn->mbuf) / sizeof(fconn->mbuf[0]));
+	fconn->streams_by_id = EB_ROOT;
+	LIST_INIT(&fconn->send_list);
+	LIST_INIT(&fconn->buf_wait.list);
+
+	conn->ctx = fconn;
+
+	if (t)
+		task_queue(t);
+
+	/* FIXME: this is temporary, for outgoing connections we need to
+	 * immediately allocate a stream until the code is modified so that the
+	 * caller calls ->attach(). For now the outgoing sc is stored as
+	 * conn->ctx by the caller and saved in conn_ctx.
+	 */
+	fstrm = fcgi_stconn_new(fconn, conn_ctx, sess);
+	if (!fstrm)
+		goto fail;
+
+
+	/* Repare to read something */
+	fcgi_conn_restart_reading(fconn, 1);
+	TRACE_LEAVE(FCGI_EV_FCONN_NEW, conn);
+	return 0;
+
+  fail:
+	task_destroy(t);
+	if (fconn->wait_event.tasklet)
+		tasklet_free(fconn->wait_event.tasklet);
+	pool_free(pool_head_fcgi_conn, fconn);
+  fail_conn:
+	conn->ctx = conn_ctx; // restore saved ctx
+	TRACE_DEVEL("leaving in error", FCGI_EV_FCONN_NEW|FCGI_EV_FCONN_END|FCGI_EV_FCONN_ERR);
+	return -1;
+}
+
+/* Returns the next allocatable outgoing stream ID for the FCGI connection, or
+ * -1 if no more is allocatable.
+ */
+static inline int32_t fcgi_conn_get_next_sid(const struct fcgi_conn *fconn)
+{
+	int32_t id = (fconn->max_id + 1) | 1;
+
+	if ((id & 0x80000000U))
+		id = -1;
+	return id;
+}
+
+/* Returns the stream associated with id <id> or NULL if not found */
+static inline struct fcgi_strm *fcgi_conn_st_by_id(struct fcgi_conn *fconn, int id)
+{
+	struct eb32_node *node;
+
+	if (id == 0)
+	 	return (struct fcgi_strm *)fcgi_mgmt_stream;
+
+	if (id > fconn->max_id)
+		return (struct fcgi_strm *)fcgi_unknown_stream;
+
+	node = eb32_lookup(&fconn->streams_by_id, id);
+	if (!node)
+		return (struct fcgi_strm *)fcgi_unknown_stream;
+	return container_of(node, struct fcgi_strm, by_id);
+}
+
+
+/* Release function. This one should be called to free all resources allocated
+ * to the mux.
+ */
+static void fcgi_release(struct fcgi_conn *fconn)
+{
+	struct connection *conn = fconn->conn;
+
+	TRACE_POINT(FCGI_EV_FCONN_END);
+
+	if (LIST_INLIST(&fconn->buf_wait.list))
+		LIST_DEL_INIT(&fconn->buf_wait.list);
+
+	fcgi_release_buf(fconn, &fconn->dbuf);
+	fcgi_release_mbuf(fconn);
+
+	if (fconn->task) {
+		fconn->task->context = NULL;
+		task_wakeup(fconn->task, TASK_WOKEN_OTHER);
+		fconn->task = NULL;
+	}
+	if (fconn->wait_event.tasklet)
+		tasklet_free(fconn->wait_event.tasklet);
+	if (conn && fconn->wait_event.events != 0)
+		conn->xprt->unsubscribe(conn, conn->xprt_ctx, fconn->wait_event.events,
+					&fconn->wait_event);
+
+	pool_free(pool_head_fcgi_conn, fconn);
+
+	if (conn) {
+		conn->mux = NULL;
+		conn->ctx = NULL;
+		TRACE_DEVEL("freeing conn", FCGI_EV_FCONN_END, conn);
+
+		conn_stop_tracking(conn);
+		conn_full_close(conn);
+		if (conn->destroy_cb)
+			conn->destroy_cb(conn);
+		conn_free(conn);
+	}
+}
+
+/* Detect a pending read0 for a FCGI connection. It happens if a read0 is
+ * pending on the connection AND if there is no more data in the demux
+ * buffer. The function returns 1 to report a read0 or 0 otherwise.
+ */
+static int fcgi_conn_read0_pending(struct fcgi_conn *fconn)
+{
+	if (conn_xprt_read0_pending(fconn->conn) && !b_data(&fconn->dbuf))
+		return 1;
+	return 0;
+}
+
+
+/* Returns true if the FCGI connection must be release */
+static inline int fcgi_conn_is_dead(struct fcgi_conn *fconn)
+{
+	if (eb_is_empty(&fconn->streams_by_id) &&               /* don't close if streams exist */
+	    (!(fconn->flags & FCGI_CF_KEEP_CONN) ||             /* don't keep the connection alive */
+	     (fconn->conn->flags & CO_FL_ERROR) ||              /* errors close immediately */
+	     (fconn->state == FCGI_CS_CLOSED && !fconn->task) ||/* a timeout stroke earlier */
+	     (!(fconn->conn->owner)) ||                         /* Nobody's left to take care of the connection, drop it now */
+	     (!br_data(fconn->mbuf) &&                          /* mux buffer empty, also process clean events below */
+	      conn_xprt_read0_pending(fconn->conn))))
+		return 1;
+	return 0;
+}
+
+
+/********************************************************/
+/* functions below are for the FCGI protocol processing */
+/********************************************************/
+
+/* Marks an error on the stream. */
+static inline void fcgi_strm_error(struct fcgi_strm *fstrm)
+{
+	if (fstrm->id && fstrm->state != FCGI_SS_ERROR) {
+		TRACE_POINT(FCGI_EV_FSTRM_ERR, fstrm->fconn->conn, fstrm);
+		if (fstrm->state < FCGI_SS_ERROR) {
+			fstrm->state = FCGI_SS_ERROR;
+			TRACE_STATE("switching to ERROR", FCGI_EV_FSTRM_ERR, fstrm->fconn->conn, fstrm);
+		}
+		se_fl_set_error(fstrm->sd);
+	}
+}
+
+/* Attempts to notify the data layer of recv availability */
+static void fcgi_strm_notify_recv(struct fcgi_strm *fstrm)
+{
+	if (fstrm->subs && (fstrm->subs->events & SUB_RETRY_RECV)) {
+		TRACE_POINT(FCGI_EV_STRM_WAKE, fstrm->fconn->conn, fstrm);
+		tasklet_wakeup(fstrm->subs->tasklet);
+		fstrm->subs->events &= ~SUB_RETRY_RECV;
+		if (!fstrm->subs->events)
+			fstrm->subs = NULL;
+	}
+}
+
+/* Attempts to notify the data layer of send availability */
+static void fcgi_strm_notify_send(struct fcgi_strm *fstrm)
+{
+	if (fstrm->subs && (fstrm->subs->events & SUB_RETRY_SEND)) {
+		TRACE_POINT(FCGI_EV_STRM_WAKE, fstrm->fconn->conn, fstrm);
+		fstrm->flags |= FCGI_SF_NOTIFIED;
+		tasklet_wakeup(fstrm->subs->tasklet);
+		fstrm->subs->events &= ~SUB_RETRY_SEND;
+		if (!fstrm->subs->events)
+			fstrm->subs = NULL;
+	}
+	else if (fstrm->flags & (FCGI_SF_WANT_SHUTR | FCGI_SF_WANT_SHUTW)) {
+		TRACE_POINT(FCGI_EV_STRM_WAKE, fstrm->fconn->conn, fstrm);
+		tasklet_wakeup(fstrm->shut_tl);
+	}
+}
+
+/* Alerts the data layer, trying to wake it up by all means, following
+ * this sequence :
+ *   - if the fcgi stream' data layer is subscribed to recv, then it's woken up
+ *     for recv
+ *   - if its subscribed to send, then it's woken up for send
+ *   - if it was subscribed to neither, its ->wake() callback is called
+ * It is safe to call this function with a closed stream which doesn't have a
+ * stream connector anymore.
+ */
+static void fcgi_strm_alert(struct fcgi_strm *fstrm)
+{
+	TRACE_POINT(FCGI_EV_STRM_WAKE, fstrm->fconn->conn, fstrm);
+	if (fstrm->subs ||
+	    (fstrm->flags & (FCGI_SF_WANT_SHUTR|FCGI_SF_WANT_SHUTW))) {
+		fcgi_strm_notify_recv(fstrm);
+		fcgi_strm_notify_send(fstrm);
+	}
+	else if (fcgi_strm_sc(fstrm) && fcgi_strm_sc(fstrm)->app_ops->wake != NULL) {
+		TRACE_POINT(FCGI_EV_STRM_WAKE, fstrm->fconn->conn, fstrm);
+		fcgi_strm_sc(fstrm)->app_ops->wake(fcgi_strm_sc(fstrm));
+	}
+}
+
+/* Writes the 16-bit record size <len> at address <record> */
+static inline void fcgi_set_record_size(void *record, uint16_t len)
+{
+	uint8_t *out = (record + 4);
+
+	*out       = (len >> 8);
+	*(out + 1) = (len & 0xff);
+}
+
+/* Writes the 16-bit stream id <id> at address <record> */
+static inline void fcgi_set_record_id(void *record, uint16_t id)
+{
+	uint8_t *out = (record + 2);
+
+	*out       = (id >> 8);
+	*(out + 1) = (id & 0xff);
+}
+
+/* Marks a FCGI stream as CLOSED and decrement the number of active streams for
+ * its connection if the stream was not yet closed. Please use this exclusively
+ * before closing a stream to ensure stream count is well maintained.
+ */
+static inline void fcgi_strm_close(struct fcgi_strm *fstrm)
+{
+	if (fstrm->state != FCGI_SS_CLOSED) {
+		TRACE_ENTER(FCGI_EV_FSTRM_END, fstrm->fconn->conn, fstrm);
+		fstrm->fconn->nb_streams--;
+		if (!fstrm->id)
+			fstrm->fconn->nb_reserved--;
+		if (fcgi_strm_sc(fstrm)) {
+			if (!se_fl_test(fstrm->sd, SE_FL_EOS) && !b_data(&fstrm->rxbuf))
+				fcgi_strm_notify_recv(fstrm);
+		}
+		fstrm->state = FCGI_SS_CLOSED;
+		TRACE_STATE("switching to CLOSED", FCGI_EV_FSTRM_END, fstrm->fconn->conn, fstrm);
+		TRACE_LEAVE(FCGI_EV_FSTRM_END, fstrm->fconn->conn, fstrm);
+	}
+}
+
+/* Detaches a FCGI stream from its FCGI connection and releases it to the
+ * fcgi_strm pool.
+ */
+static void fcgi_strm_destroy(struct fcgi_strm *fstrm)
+{
+	struct connection *conn = fstrm->fconn->conn;
+
+	TRACE_ENTER(FCGI_EV_FSTRM_END, conn, fstrm);
+
+	fcgi_strm_close(fstrm);
+	eb32_delete(&fstrm->by_id);
+	if (b_size(&fstrm->rxbuf)) {
+		b_free(&fstrm->rxbuf);
+		offer_buffers(NULL, 1);
+	}
+	if (fstrm->subs)
+		fstrm->subs->events = 0;
+	/* There's no need to explicitly call unsubscribe here, the only
+	 * reference left would be in the fconn send_list/fctl_list, and if
+	 * we're in it, we're getting out anyway
+	 */
+	LIST_DEL_INIT(&fstrm->send_list);
+	tasklet_free(fstrm->shut_tl);
+	BUG_ON(fstrm->sd && !se_fl_test(fstrm->sd, SE_FL_ORPHAN));
+	sedesc_free(fstrm->sd);
+	pool_free(pool_head_fcgi_strm, fstrm);
+
+	TRACE_LEAVE(FCGI_EV_FSTRM_END, conn);
+}
+
+/* Allocates a new stream <id> for connection <fconn> and adds it into fconn's
+ * stream tree. In case of error, nothing is added and NULL is returned. The
+ * causes of errors can be any failed memory allocation. The caller is
+ * responsible for checking if the connection may support an extra stream prior
+ * to calling this function.
+ */
+static struct fcgi_strm *fcgi_strm_new(struct fcgi_conn *fconn, int id)
+{
+	struct fcgi_strm *fstrm;
+
+	TRACE_ENTER(FCGI_EV_FSTRM_NEW, fconn->conn);
+
+	fstrm = pool_alloc(pool_head_fcgi_strm);
+	if (!fstrm) {
+		TRACE_ERROR("fstrm allocation failure", FCGI_EV_FSTRM_NEW|FCGI_EV_FSTRM_ERR|FCGI_EV_FSTRM_END, fconn->conn);
+		goto out;
+	}
+
+	fstrm->shut_tl = tasklet_new();
+	if (!fstrm->shut_tl) {
+		TRACE_ERROR("fstrm shut tasklet allocation failure", FCGI_EV_FSTRM_NEW|FCGI_EV_FSTRM_ERR|FCGI_EV_FSTRM_END, fconn->conn);
+		pool_free(pool_head_fcgi_strm, fstrm);
+		goto out;
+	}
+	fstrm->subs = NULL;
+	fstrm->shut_tl->process = fcgi_deferred_shut;
+	fstrm->shut_tl->context = fstrm;
+	LIST_INIT(&fstrm->send_list);
+	fstrm->fconn = fconn;
+	fstrm->sd = NULL;
+	fstrm->flags = FCGI_SF_NONE;
+	fstrm->proto_status = 0;
+	fstrm->state = FCGI_SS_IDLE;
+	fstrm->rxbuf = BUF_NULL;
+
+	h1m_init_res(&fstrm->h1m);
+	fstrm->h1m.err_pos = -1; // don't care about errors on the request path
+	fstrm->h1m.flags |= (H1_MF_NO_PHDR|H1_MF_CLEAN_CONN_HDR);
+
+	fstrm->by_id.key = fstrm->id = id;
+	if (id > 0)
+		fconn->max_id = id;
+	else
+		fconn->nb_reserved++;
+
+	eb32_insert(&fconn->streams_by_id, &fstrm->by_id);
+	fconn->nb_streams++;
+	fconn->stream_cnt++;
+
+	TRACE_LEAVE(FCGI_EV_FSTRM_NEW, fconn->conn, fstrm);
+	return fstrm;
+
+  out:
+	TRACE_DEVEL("leaving in error", FCGI_EV_FSTRM_NEW|FCGI_EV_FSTRM_ERR|FCGI_EV_FSTRM_END, fconn->conn);
+	return NULL;
+}
+
+/* Allocates a new stream associated to stream connector <sc> on the FCGI connection
+ * <fconn> and returns it, or NULL in case of memory allocation error or if the
+ * highest possible stream ID was reached.
+ */
+static struct fcgi_strm *fcgi_stconn_new(struct fcgi_conn *fconn, struct stconn *sc,
+					 struct session *sess)
+{
+	struct fcgi_strm *fstrm = NULL;
+
+	TRACE_ENTER(FCGI_EV_FSTRM_NEW, fconn->conn);
+	if (fconn->nb_streams >= fconn->streams_limit) {
+		TRACE_ERROR("streams_limit reached", FCGI_EV_FSTRM_NEW|FCGI_EV_FSTRM_END|FCGI_EV_FSTRM_ERR, fconn->conn);
+		goto out;
+	}
+
+	if (fcgi_streams_left(fconn) < 1) {
+		TRACE_ERROR("!streams_left", FCGI_EV_FSTRM_NEW|FCGI_EV_FSTRM_END|FCGI_EV_FSTRM_ERR, fconn->conn);
+		goto out;
+	}
+
+	/* Defer choosing the ID until we send the first message to create the stream */
+	fstrm = fcgi_strm_new(fconn, 0);
+	if (!fstrm) {
+		TRACE_ERROR("fstream allocation failure", FCGI_EV_FSTRM_NEW|FCGI_EV_FSTRM_END|FCGI_EV_FSTRM_ERR, fconn->conn);
+		goto out;
+	}
+	if (sc_attach_mux(sc, fstrm, fconn->conn) < 0)
+		goto out;
+	fstrm->sd = sc->sedesc;
+	fstrm->sess = sess;
+	fconn->nb_sc++;
+
+	TRACE_LEAVE(FCGI_EV_FSTRM_NEW, fconn->conn, fstrm);
+	return fstrm;
+
+  out:
+	TRACE_DEVEL("leaving on error", FCGI_EV_FSTRM_NEW|FCGI_EV_FSTRM_END|FCGI_EV_FSTRM_ERR, fconn->conn);
+	fcgi_strm_destroy(fstrm);
+	return NULL;
+}
+
+/* Wakes a specific stream and assign its stream connector some SE_FL_* flags among
+ * SE_FL_ERR_PENDING and SE_FL_ERROR if needed. The stream's state is
+ * automatically updated accordingly. If the stream is orphaned, it is
+ * destroyed.
+ */
+static void fcgi_strm_wake_one_stream(struct fcgi_strm *fstrm)
+{
+	struct fcgi_conn *fconn = fstrm->fconn;
+
+	TRACE_ENTER(FCGI_EV_STRM_WAKE, fconn->conn, fstrm);
+
+	if (!fcgi_strm_sc(fstrm)) {
+		/* this stream was already orphaned */
+		fcgi_strm_destroy(fstrm);
+		TRACE_DEVEL("leaving with no fstrm", FCGI_EV_STRM_WAKE, fconn->conn);
+		return;
+	}
+
+	if (fcgi_conn_read0_pending(fconn)) {
+		if (fstrm->state == FCGI_SS_OPEN) {
+			fstrm->state = FCGI_SS_HREM;
+			TRACE_STATE("switching to HREM", FCGI_EV_STRM_WAKE|FCGI_EV_FSTRM_END, fconn->conn, fstrm);
+		}
+		else if (fstrm->state == FCGI_SS_HLOC)
+			fcgi_strm_close(fstrm);
+	}
+
+	if ((fconn->state == FCGI_CS_CLOSED || fconn->conn->flags & CO_FL_ERROR)) {
+		se_fl_set(fstrm->sd, SE_FL_ERR_PENDING);
+		if (se_fl_test(fstrm->sd, SE_FL_EOS))
+			se_fl_set(fstrm->sd, SE_FL_ERROR);
+
+		if (fstrm->state < FCGI_SS_ERROR) {
+			fstrm->state = FCGI_SS_ERROR;
+			TRACE_STATE("switching to ERROR", FCGI_EV_STRM_WAKE|FCGI_EV_FSTRM_END, fconn->conn, fstrm);
+		}
+	}
+
+	fcgi_strm_alert(fstrm);
+
+	TRACE_LEAVE(FCGI_EV_STRM_WAKE, fconn->conn, fstrm);
+}
+
+/* Wakes unassigned streams (ID == 0) attached to the connection. */
+static void fcgi_wake_unassigned_streams(struct fcgi_conn *fconn)
+{
+	struct eb32_node *node;
+	struct fcgi_strm *fstrm;
+
+	node = eb32_lookup(&fconn->streams_by_id, 0);
+	while (node) {
+		fstrm = container_of(node, struct fcgi_strm, by_id);
+		if (fstrm->id > 0)
+			break;
+		node = eb32_next(node);
+		fcgi_strm_wake_one_stream(fstrm);
+	}
+}
+
+/* Wakes the streams attached to the connection, whose id is greater than <last>
+ * or unassigned.
+ */
+static void fcgi_wake_some_streams(struct fcgi_conn *fconn, int last)
+{
+	struct eb32_node *node;
+	struct fcgi_strm *fstrm;
+
+	TRACE_ENTER(FCGI_EV_STRM_WAKE, fconn->conn);
+
+	/* Wake all streams with ID > last */
+	node = eb32_lookup_ge(&fconn->streams_by_id, last + 1);
+	while (node) {
+		fstrm = container_of(node, struct fcgi_strm, by_id);
+		node = eb32_next(node);
+		fcgi_strm_wake_one_stream(fstrm);
+	}
+	fcgi_wake_unassigned_streams(fconn);
+
+	TRACE_LEAVE(FCGI_EV_STRM_WAKE, fconn->conn);
+}
+
+static int fcgi_set_default_param(struct fcgi_conn *fconn, struct fcgi_strm *fstrm,
+				  struct htx *htx, struct htx_sl *sl,
+				  struct fcgi_strm_params *params)
+{
+	struct connection *cli_conn = objt_conn(fstrm->sess->origin);
+	const struct sockaddr_storage *src = (sc_check(fcgi_strm_sc(fstrm)) ? conn_src(fconn->conn) : sc_src(sc_opposite(fcgi_strm_sc(fstrm))));
+	const struct sockaddr_storage *dst = (sc_check(fcgi_strm_sc(fstrm)) ? conn_dst(fconn->conn) : sc_dst(sc_opposite(fcgi_strm_sc(fstrm))));
+	struct ist p;
+
+	if (!sl)
+		goto error;
+
+	if (!(params->mask & FCGI_SP_DOC_ROOT))
+		params->docroot = fconn->app->docroot;
+
+	if (!(params->mask & FCGI_SP_REQ_METH)) {
+		p  = htx_sl_req_meth(sl);
+		params->meth = ist2(b_tail(params->p), p.len);
+		chunk_istcat(params->p, p);
+	}
+	if (!(params->mask & FCGI_SP_REQ_URI)) {
+		p = h1_get_uri(sl);
+		params->uri = ist2(b_tail(params->p), p.len);
+		chunk_istcat(params->p, p);
+	}
+	if (!(params->mask & FCGI_SP_SRV_PROTO)) {
+		p  = htx_sl_req_vsn(sl);
+		params->vsn = ist2(b_tail(params->p), p.len);
+		chunk_istcat(params->p, p);
+	}
+	if (!(params->mask & FCGI_SP_SRV_PORT)) {
+		char *end;
+		int port = 0;
+		if (dst)
+			port = get_host_port(dst);
+		end = ultoa_o(port, b_tail(params->p), b_room(params->p));
+		if (!end)
+			goto error;
+		params->srv_port = ist2(b_tail(params->p), end - b_tail(params->p));
+		params->p->data += params->srv_port.len;
+	}
+	if (!(params->mask & FCGI_SP_SRV_NAME)) {
+		/* If no Host header found, use the server address to fill
+		 * srv_name */
+		if (!istlen(params->srv_name)) {
+			char *ptr = NULL;
+
+			if (dst)
+				if (addr_to_str(dst, b_tail(params->p), b_room(params->p)) != -1)
+					ptr = b_tail(params->p);
+			if (ptr) {
+				params->srv_name = ist(ptr);
+				params->p->data += params->srv_name.len;
+			}
+		}
+	}
+	if (!(params->mask & FCGI_SP_REM_ADDR)) {
+		char *ptr = NULL;
+
+		if (src)
+			if (addr_to_str(src, b_tail(params->p), b_room(params->p)) != -1)
+				ptr = b_tail(params->p);
+		if (ptr) {
+			params->rem_addr = ist(ptr);
+			params->p->data += params->rem_addr.len;
+		}
+	}
+	if (!(params->mask & FCGI_SP_REM_PORT)) {
+		char *end;
+		int port = 0;
+		if (src)
+			port = get_host_port(src);
+		end = ultoa_o(port, b_tail(params->p), b_room(params->p));
+		if (!end)
+			goto error;
+		params->rem_port = ist2(b_tail(params->p), end - b_tail(params->p));
+		params->p->data += params->rem_port.len;
+	}
+	if (!(params->mask & FCGI_SP_CONT_LEN)) {
+		struct htx_blk *blk;
+		enum htx_blk_type type;
+		char *end;
+		size_t len = 0;
+
+		for (blk = htx_get_head_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
+			type = htx_get_blk_type(blk);
+
+			if (type == HTX_BLK_TLR || type == HTX_BLK_EOT)
+				break;
+			if (type == HTX_BLK_DATA)
+				len += htx_get_blksz(blk);
+		}
+		end = ultoa_o(len, b_tail(params->p), b_room(params->p));
+		if (!end)
+			goto error;
+		params->cont_len = ist2(b_tail(params->p), end - b_tail(params->p));
+		params->p->data += params->cont_len.len;
+	}
+
+	if (!(params->mask & FCGI_SP_HTTPS)) {
+		if (cli_conn)
+			params->https = conn_is_ssl(cli_conn);
+	}
+
+	if ((params->mask & FCGI_SP_URI_MASK) != FCGI_SP_URI_MASK) {
+		/* one of scriptname, pathinfo or query_string is no set */
+		struct http_uri_parser parser = http_uri_parser_init(params->uri);
+		struct ist path = http_parse_path(&parser);
+		int len;
+
+		/* No scrit_name set but no valid path ==> error */
+		if (!(params->mask & FCGI_SP_SCRIPT_NAME) && !istlen(path))
+			goto error;
+
+		/* If there is a query-string, Set it if not already set */
+		if (!(params->mask & FCGI_SP_REQ_QS)) {
+			struct ist qs = istfind(path, '?');
+
+			/* Update the path length */
+			path.len -= qs.len;
+
+			/* Set the query-string skipping the '?', if any */
+			if (istlen(qs))
+				params->qs = istnext(qs);
+		}
+
+		/* If the script_name is set, don't try to deduce the path_info
+		 * too. The opposite is not true.
+		 */
+		if (params->mask & FCGI_SP_SCRIPT_NAME) {
+			params->mask |= FCGI_SP_PATH_INFO;
+			goto end;
+		}
+
+		/* Decode the path. it must first be copied to keep the URI
+		 * untouched.
+		 */
+		chunk_istcat(params->p, path);
+		path.ptr = b_tail(params->p) - path.len;
+		len = url_decode(ist0(path), 0);
+		if (len < 0)
+			goto error;
+		path.len = len;
+
+		/* script_name not set, preset it with the path for now */
+		params->scriptname = path;
+
+		/* If there is no regex to match the pathinfo, just to the last
+		 * part and see if the index must be used.
+		 */
+		if (!fconn->app->pathinfo_re)
+			goto check_index;
+
+		/* If some special characters are found in the decoded path (\n
+		 * or \0), the PATH_INFO regex cannot match. This is theoretically
+		 * valid, but probably unexpected, to have such characters. So,
+		 * to avoid any surprises, an error is triggered in this
+		 * case.
+		 */
+		if (istchr(path, '\n') || istchr(path, '\0'))
+			goto error;
+
+		/* The regex does not match, just to the last part and see if
+		 * the index must be used.
+		 */
+		if (!regex_exec_match2(fconn->app->pathinfo_re, path.ptr, len, MAX_MATCH, pmatch, 0))
+			goto check_index;
+
+		/* We must have at least 1 capture for the script name,
+		 * otherwise we do nothing and jump to the last part.
+		 */
+		if (pmatch[1].rm_so == -1 || pmatch[1].rm_eo == -1)
+			goto check_index;
+
+		/* Finally we can set the script_name and the path_info. The
+		 * path_info is set if not already defined, and if it was
+		 * captured
+		 */
+		params->scriptname = ist2(path.ptr + pmatch[1].rm_so, pmatch[1].rm_eo - pmatch[1].rm_so);
+		if (!(params->mask & FCGI_SP_PATH_INFO) && !(pmatch[2].rm_so == -1 || pmatch[2].rm_eo == -1))
+			params->pathinfo = ist2(path.ptr + pmatch[2].rm_so, pmatch[2].rm_eo - pmatch[2].rm_so);
+
+	  check_index:
+		len = params->scriptname.len;
+		/* the script_name if finished by a '/' so we can add the index
+		 * part, if any.
+		 */
+		if (istlen(fconn->app->index) && params->scriptname.ptr[len-1] == '/') {
+			struct ist sn = params->scriptname;
+
+			params->scriptname = ist2(b_tail(params->p), len+fconn->app->index.len);
+			chunk_istcat(params->p, sn);
+			chunk_istcat(params->p, fconn->app->index);
+		}
+	}
+
+	if (!(params->mask & FCGI_SP_SRV_SOFT)) {
+		params->srv_soft = ist2(b_tail(params->p), 0);
+		chunk_appendf(params->p, "HAProxy %s", haproxy_version);
+		params->srv_soft.len = b_tail(params->p) - params->srv_soft.ptr;
+	}
+
+  end:
+	return 1;
+  error:
+	return 0;
+}
+
+static int fcgi_encode_default_param(struct fcgi_conn *fconn, struct fcgi_strm *fstrm,
+				     struct fcgi_strm_params *params, struct buffer *outbuf, int flag)
+{
+	struct fcgi_param p;
+
+	if (params->mask & flag)
+		return 1;
+
+	chunk_reset(&trash);
+
+	switch (flag) {
+		case FCGI_SP_CGI_GATEWAY:
+			p.n = ist("GATEWAY_INTERFACE");
+			p.v = ist("CGI/1.1");
+			goto encode;
+		case FCGI_SP_DOC_ROOT:
+			p.n = ist("DOCUMENT_ROOT");
+			p.v = params->docroot;
+			goto encode;
+		case FCGI_SP_SCRIPT_NAME:
+			p.n = ist("SCRIPT_NAME");
+			p.v = params->scriptname;
+			goto encode;
+		case FCGI_SP_PATH_INFO:
+			p.n = ist("PATH_INFO");
+			p.v = params->pathinfo;
+			goto encode;
+		case FCGI_SP_REQ_URI:
+			p.n = ist("REQUEST_URI");
+			p.v = params->uri;
+			goto encode;
+		case FCGI_SP_REQ_METH:
+			p.n = ist("REQUEST_METHOD");
+			p.v = params->meth;
+			goto encode;
+		case FCGI_SP_REQ_QS:
+			p.n = ist("QUERY_STRING");
+			p.v = params->qs;
+			goto encode;
+		case FCGI_SP_SRV_NAME:
+			p.n = ist("SERVER_NAME");
+			p.v = params->srv_name;
+			goto encode;
+		case FCGI_SP_SRV_PORT:
+			p.n = ist("SERVER_PORT");
+			p.v = params->srv_port;
+			goto encode;
+		case FCGI_SP_SRV_PROTO:
+			p.n = ist("SERVER_PROTOCOL");
+			p.v = params->vsn;
+			goto encode;
+		case FCGI_SP_REM_ADDR:
+			p.n = ist("REMOTE_ADDR");
+			p.v = params->rem_addr;
+			goto encode;
+		case FCGI_SP_REM_PORT:
+			p.n = ist("REMOTE_PORT");
+			p.v = params->rem_port;
+			goto encode;
+		case FCGI_SP_SCRIPT_FILE:
+			p.n = ist("SCRIPT_FILENAME");
+			chunk_istcat(&trash, params->docroot);
+			chunk_istcat(&trash, params->scriptname);
+			p.v = ist2(b_head(&trash), b_data(&trash));
+			goto encode;
+		case FCGI_SP_PATH_TRANS:
+			if (!istlen(params->pathinfo))
+				goto skip;
+			p.n = ist("PATH_TRANSLATED");
+			chunk_istcat(&trash, params->docroot);
+			chunk_istcat(&trash, params->pathinfo);
+			p.v = ist2(b_head(&trash), b_data(&trash));
+			goto encode;
+		case FCGI_SP_CONT_LEN:
+			p.n = ist("CONTENT_LENGTH");
+			p.v = params->cont_len;
+			goto encode;
+		case FCGI_SP_HTTPS:
+			if (!params->https)
+				goto skip;
+			p.n = ist("HTTPS");
+			p.v = ist("on");
+			goto encode;
+		case FCGI_SP_SRV_SOFT:
+			p.n = ist("SERVER_SOFTWARE");
+			p.v = params->srv_soft;
+			goto encode;
+		default:
+			goto skip;
+	}
+
+  encode:
+	if (!istlen(p.v))
+		goto skip;
+	if (!fcgi_encode_param(outbuf, &p))
+		return 0;
+  skip:
+	params->mask |= flag;
+	return 1;
+}
+
+/* Sends a GET_VALUES record. Returns > 0 on success, 0 if it couldn't do
+ * anything. It is highly unexpected, but if the record is larger than a buffer
+ * and cannot be encoded in one time, an error is triggered and the connection is
+ * closed. GET_VALUES record cannot be split.
+ */
+static int fcgi_conn_send_get_values(struct fcgi_conn *fconn)
+{
+	struct buffer outbuf;
+	struct buffer *mbuf;
+	struct fcgi_param max_reqs   = { .n = ist("FCGI_MAX_REQS"),   .v = ist("")};
+	struct fcgi_param mpxs_conns = { .n = ist("FCGI_MPXS_CONNS"), .v = ist("")};
+	int ret = 0;
+
+	TRACE_ENTER(FCGI_EV_TX_RECORD|FCGI_EV_TX_GETVAL, fconn->conn);
+
+	mbuf = br_tail(fconn->mbuf);
+  retry:
+	if (!fcgi_get_buf(fconn, mbuf)) {
+		fconn->flags |= FCGI_CF_MUX_MALLOC;
+		fconn->flags |= FCGI_CF_DEM_MROOM;
+		TRACE_STATE("waiting for fconn mbuf ring allocation", FCGI_EV_TX_RECORD|FCGI_EV_FCONN_BLK, fconn->conn);
+		ret = 0;
+		goto end;
+	}
+
+	while (1) {
+		outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
+		if (outbuf.size >= FCGI_RECORD_HEADER_SZ || !b_space_wraps(mbuf))
+			break;
+	  realign_again:
+		b_slow_realign(mbuf, trash.area, b_data(mbuf));
+	}
+
+	if (outbuf.size < FCGI_RECORD_HEADER_SZ)
+		goto full;
+
+	/* vsn: 1(FCGI_VERSION), type: (9)FCGI_GET_VALUES, id: 0x0000,
+	 *  len: 0x0000 (fill later), padding: 0x00, rsv: 0x00 */
+	memcpy(outbuf.area, "\x01\x09\x00\x00\x00\x00\x00\x00", FCGI_RECORD_HEADER_SZ);
+	outbuf.data = FCGI_RECORD_HEADER_SZ;
+
+	/* Note: Don't send the param FCGI_MAX_CONNS because its value cannot be
+	 *       handled by HAProxy.
+	 */
+	if (!fcgi_encode_param(&outbuf, &max_reqs) || !fcgi_encode_param(&outbuf, &mpxs_conns))
+		goto full;
+
+	/* update the record's size now */
+	TRACE_PROTO("FCGI GET_VALUES record xferred", FCGI_EV_TX_RECORD|FCGI_EV_TX_GETVAL, fconn->conn, 0, 0, (size_t[]){outbuf.data-8});
+	fcgi_set_record_size(outbuf.area, outbuf.data - FCGI_RECORD_HEADER_SZ);
+	b_add(mbuf, outbuf.data);
+	ret = 1;
+
+  end:
+	TRACE_LEAVE(FCGI_EV_TX_RECORD|FCGI_EV_TX_GETVAL, fconn->conn);
+	return ret;
+  full:
+	/* Too large to be encoded. For GET_VALUES records, it is an error */
+	if (!b_data(mbuf)) {
+		TRACE_ERROR("GET_VALUES record too large", FCGI_EV_TX_RECORD|FCGI_EV_TX_GETVAL|FCGI_EV_FCONN_ERR, fconn->conn);
+		goto fail;
+	}
+
+	if ((mbuf = br_tail_add(fconn->mbuf)) != NULL)
+		goto retry;
+	fconn->flags |= FCGI_CF_MUX_MFULL;
+	fconn->flags |= FCGI_CF_DEM_MROOM;
+	TRACE_STATE("mbuf ring full", FCGI_EV_TX_RECORD|FCGI_EV_FCONN_BLK, fconn->conn);
+	ret = 0;
+	goto end;
+  fail:
+	fconn->state = FCGI_CS_CLOSED;
+	TRACE_STATE("switching to CLOSED", FCGI_EV_TX_RECORD|FCGI_EV_TX_GETVAL|FCGI_EV_FCONN_END, fconn->conn);
+	TRACE_DEVEL("leaving on error", FCGI_EV_TX_RECORD|FCGI_EV_TX_GETVAL|FCGI_EV_FCONN_ERR, fconn->conn);
+	return 0;
+}
+
+/* Processes a GET_VALUES_RESULT record. Returns > 0 on success, 0 if it
+ * couldn't do anything. It is highly unexpected, but if the record is larger
+ * than a buffer and cannot be decoded in one time, an error is triggered and
+ * the connection is closed. GET_VALUES_RESULT record cannot be split.
+ */
+static int fcgi_conn_handle_values_result(struct fcgi_conn *fconn)
+{
+	struct buffer inbuf;
+	struct buffer *dbuf;
+	size_t offset;
+
+	TRACE_ENTER(FCGI_EV_RX_RECORD|FCGI_EV_RX_GETVAL, fconn->conn);
+
+	dbuf = &fconn->dbuf;
+
+	/* Record too large to be fully decoded */
+	if (b_size(dbuf) < (fconn->drl + fconn->drp))
+		goto fail;
+
+	/* process full record only */
+	if (b_data(dbuf) < (fconn->drl + fconn->drp)) {
+		TRACE_DEVEL("leaving on missing data", FCGI_EV_RX_RECORD|FCGI_EV_RX_GETVAL, fconn->conn);
+		return 0;
+	}
+
+	if (unlikely(b_contig_data(dbuf, b_head_ofs(dbuf)) < fconn->drl)) {
+		/* Realign the dmux buffer if the record wraps. It is unexpected
+		 * at this stage because it should be the first record received
+		 * from the FCGI application.
+		 */
+		b_slow_realign_ofs(dbuf, trash.area, 0);
+	}
+
+	inbuf = b_make(b_head(dbuf), b_data(dbuf), 0, fconn->drl);
+
+	for (offset = 0; offset < b_data(&inbuf); ) {
+		struct fcgi_param p;
+		size_t ret;
+
+		ret = fcgi_aligned_decode_param(&inbuf, offset, &p);
+		if (!ret) {
+			/* name or value too large to be decoded at once */
+			TRACE_ERROR("error decoding GET_VALUES_RESULT param", FCGI_EV_RX_RECORD|FCGI_EV_RX_GETVAL|FCGI_EV_FCONN_ERR, fconn->conn);
+			goto fail;
+		}
+		offset += ret;
+
+		if (isteqi(p.n, ist("FCGI_MPXS_CONNS"))) {
+			if (isteq(p.v, ist("1"))) {
+				TRACE_STATE("set mpxs param", FCGI_EV_RX_RECORD|FCGI_EV_RX_GETVAL, fconn->conn, 0, 0, (size_t[]){1});
+				fconn->flags |= FCGI_CF_MPXS_CONNS;
+			}
+			else {
+				TRACE_STATE("set mpxs param", FCGI_EV_RX_RECORD|FCGI_EV_RX_GETVAL, fconn->conn, 0, 0, (size_t[]){0});
+				fconn->flags &= ~FCGI_CF_MPXS_CONNS;
+			}
+		}
+		else if (isteqi(p.n, ist("FCGI_MAX_REQS"))) {
+			fconn->streams_limit = strl2ui(p.v.ptr, p.v.len);
+			TRACE_STATE("set streams_limit", FCGI_EV_RX_RECORD|FCGI_EV_RX_GETVAL, fconn->conn, 0, 0, (size_t[]){fconn->streams_limit});
+		}
+		/*
+		 * Ignore all other params
+		 */
+	}
+
+	/* Reset the number of concurrent streams supported if the FCGI
+	 * application does not support connection multiplexing
+	 */
+	if (!(fconn->flags & FCGI_CF_MPXS_CONNS)) {
+		fconn->streams_limit = 1;
+		TRACE_STATE("no mpxs for streams_limit to 1", FCGI_EV_RX_RECORD|FCGI_EV_RX_GETVAL, fconn->conn);
+	}
+
+	/* We must be sure to have read exactly the announced record length, no
+	 * more no less
+	 */
+	if (offset != fconn->drl) {
+		TRACE_ERROR("invalid GET_VALUES_RESULT record length", FCGI_EV_RX_RECORD|FCGI_EV_RX_GETVAL|FCGI_EV_FCONN_ERR, fconn->conn);
+		goto fail;
+	}
+
+	TRACE_PROTO("FCGI GET_VALUES_RESULT record rcvd", FCGI_EV_RX_RECORD|FCGI_EV_RX_GETVAL, fconn->conn, 0, 0, (size_t[]){fconn->drl});
+	b_del(&fconn->dbuf, fconn->drl + fconn->drp);
+	fconn->drl = 0;
+	fconn->drp = 0;
+	fconn->state = FCGI_CS_RECORD_H;
+	fcgi_wake_unassigned_streams(fconn);
+	TRACE_STATE("switching to RECORD_H", FCGI_EV_RX_RECORD|FCGI_EV_RX_FHDR, fconn->conn);
+	TRACE_LEAVE(FCGI_EV_RX_RECORD|FCGI_EV_RX_GETVAL, fconn->conn);
+	return 1;
+  fail:
+	fconn->state = FCGI_CS_CLOSED;
+	TRACE_STATE("switching to CLOSED", FCGI_EV_RX_RECORD|FCGI_EV_RX_GETVAL, fconn->conn);
+	TRACE_DEVEL("leaving on error", FCGI_EV_RX_RECORD|FCGI_EV_RX_GETVAL|FCGI_EV_FCONN_ERR, fconn->conn);
+	return 0;
+}
+
+/* Sends an ABORT_REQUEST record for each active streams. Closed streams are
+ * excluded, as the streams which already received the end-of-stream. It returns
+ * > 0 if the record was sent tp all streams. Otherwise it returns 0.
+ */
+static int fcgi_conn_send_aborts(struct fcgi_conn *fconn)
+{
+	struct eb32_node *node;
+	struct fcgi_strm *fstrm;
+
+	TRACE_ENTER(FCGI_EV_TX_RECORD, fconn->conn);
+
+	node = eb32_lookup_ge(&fconn->streams_by_id, 1);
+	while (node) {
+		fstrm = container_of(node, struct fcgi_strm, by_id);
+		node = eb32_next(node);
+		if (fstrm->state != FCGI_SS_CLOSED &&
+		    !(fstrm->flags & (FCGI_SF_ES_RCVD|FCGI_SF_ABRT_SENT)) &&
+		    !fcgi_strm_send_abort(fconn, fstrm))
+			return 0;
+	}
+	fconn->flags |= FCGI_CF_ABRTS_SENT;
+	TRACE_STATE("aborts sent to all fstrms", FCGI_EV_TX_RECORD, fconn->conn);
+	TRACE_LEAVE(FCGI_EV_TX_RECORD, fconn->conn);
+	return 1;
+}
+
+/* Sends a BEGIN_REQUEST record. It returns > 0 on success, 0 if it couldn't do
+ * anything. BEGIN_REQUEST record cannot be split. So we wait to have enough
+ * space to proceed. It is small enough to be encoded in an empty buffer.
+ */
+static int fcgi_strm_send_begin_request(struct fcgi_conn *fconn, struct fcgi_strm *fstrm)
+{
+	struct buffer outbuf;
+	struct buffer *mbuf;
+	struct fcgi_begin_request rec = { .role = FCGI_RESPONDER, .flags = 0};
+	int ret;
+
+	TRACE_ENTER(FCGI_EV_TX_RECORD|FCGI_EV_TX_BEGREQ, fconn->conn, fstrm);
+
+	mbuf = br_tail(fconn->mbuf);
+  retry:
+	if (!fcgi_get_buf(fconn, mbuf)) {
+		fconn->flags |= FCGI_CF_MUX_MALLOC;
+		fstrm->flags |= FCGI_SF_BLK_MROOM;
+		TRACE_STATE("waiting for fconn mbuf ring allocation", FCGI_EV_TX_RECORD|FCGI_EV_FSTRM_BLK|FCGI_EV_FCONN_BLK, fconn->conn, fstrm);
+		ret = 0;
+		goto end;
+	}
+
+	while (1) {
+		outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
+		if (outbuf.size >= FCGI_RECORD_HEADER_SZ || !b_space_wraps(mbuf))
+			break;
+	  realign_again:
+		b_slow_realign(mbuf, trash.area, b_data(mbuf));
+	}
+
+	if (outbuf.size < FCGI_RECORD_HEADER_SZ)
+		goto full;
+
+	/* vsn: 1(FCGI_VERSION), type: (1)FCGI_BEGIN_REQUEST, id: fstrm->id,
+	 *  len: 0x0008, padding: 0x00, rsv: 0x00 */
+	memcpy(outbuf.area, "\x01\x01\x00\x00\x00\x08\x00\x00", FCGI_RECORD_HEADER_SZ);
+	fcgi_set_record_id(outbuf.area, fstrm->id);
+	outbuf.data = FCGI_RECORD_HEADER_SZ;
+
+	if (fconn->flags & FCGI_CF_KEEP_CONN) {
+		TRACE_STATE("keep connection opened", FCGI_EV_TX_RECORD|FCGI_EV_TX_BEGREQ, fconn->conn, fstrm);
+		rec.flags |= FCGI_KEEP_CONN;
+	}
+	if (!fcgi_encode_begin_request(&outbuf, &rec))
+		goto full;
+
+	/* commit the record */
+	TRACE_PROTO("FCGI BEGIN_REQUEST record xferred", FCGI_EV_TX_RECORD|FCGI_EV_TX_BEGREQ, fconn->conn, fstrm, 0, (size_t[]){0});
+	b_add(mbuf, outbuf.data);
+	fstrm->flags |= FCGI_SF_BEGIN_SENT;
+	fstrm->state = FCGI_SS_OPEN;
+	TRACE_STATE("switching to OPEN", FCGI_EV_TX_RECORD|FCGI_EV_TX_BEGREQ, fconn->conn, fstrm);
+	ret = 1;
+
+  end:
+	TRACE_LEAVE(FCGI_EV_TX_RECORD|FCGI_EV_TX_BEGREQ, fconn->conn, fstrm);
+	return ret;
+  full:
+	if ((mbuf = br_tail_add(fconn->mbuf)) != NULL)
+		goto retry;
+	fconn->flags |= FCGI_CF_MUX_MFULL;
+	fstrm->flags |= FCGI_SF_BLK_MROOM;
+	TRACE_STATE("mbuf ring full", FCGI_EV_TX_RECORD|FCGI_EV_FSTRM_BLK|FCGI_EV_FCONN_BLK, fconn->conn);
+	ret = 0;
+	goto end;
+}
+
+/* Sends an empty record of type <rtype>. It returns > 0 on success, 0 if it
+ * couldn't do anything. Empty record cannot be split. So we wait to have enough
+ * space to proceed. It is small enough to be encoded in an empty buffer.
+ */
+static int fcgi_strm_send_empty_record(struct fcgi_conn *fconn, struct fcgi_strm *fstrm,
+				       enum fcgi_record_type rtype)
+{
+	struct buffer outbuf;
+	struct buffer *mbuf;
+	int ret;
+
+	TRACE_ENTER(FCGI_EV_TX_RECORD, fconn->conn, fstrm);
+	mbuf = br_tail(fconn->mbuf);
+  retry:
+	if (!fcgi_get_buf(fconn, mbuf)) {
+		fconn->flags |= FCGI_CF_MUX_MALLOC;
+		fstrm->flags |= FCGI_SF_BLK_MROOM;
+		TRACE_STATE("waiting for fconn mbuf ring allocation", FCGI_EV_TX_RECORD|FCGI_EV_FSTRM_BLK|FCGI_EV_FCONN_BLK, fconn->conn, fstrm);
+		ret = 0;
+		goto end;
+	}
+
+	while (1) {
+		outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
+		if (outbuf.size >= FCGI_RECORD_HEADER_SZ || !b_space_wraps(mbuf))
+			break;
+	  realign_again:
+		b_slow_realign(mbuf, trash.area, b_data(mbuf));
+	}
+
+	if (outbuf.size < FCGI_RECORD_HEADER_SZ)
+		goto full;
+
+	/* vsn: 1(FCGI_VERSION), type: rtype, id: fstrm->id,
+	 *  len: 0x0000, padding: 0x00, rsv: 0x00 */
+	memcpy(outbuf.area, "\x01\x05\x00\x00\x00\x00\x00\x00", FCGI_RECORD_HEADER_SZ);
+	outbuf.area[1] = rtype;
+	fcgi_set_record_id(outbuf.area, fstrm->id);
+	outbuf.data = FCGI_RECORD_HEADER_SZ;
+
+	/* commit the record */
+	b_add(mbuf, outbuf.data);
+	ret = 1;
+
+  end:
+	TRACE_LEAVE(FCGI_EV_TX_RECORD, fconn->conn, fstrm);
+	return ret;
+  full:
+	if ((mbuf = br_tail_add(fconn->mbuf)) != NULL)
+		goto retry;
+	fconn->flags |= FCGI_CF_MUX_MFULL;
+	fstrm->flags |= FCGI_SF_BLK_MROOM;
+	TRACE_STATE("mbuf ring full", FCGI_EV_TX_RECORD|FCGI_EV_FSTRM_BLK|FCGI_EV_FCONN_BLK, fconn->conn, fstrm);
+	ret = 0;
+	goto end;
+}
+
+
+/* Sends an empty PARAMS record. It relies on fcgi_strm_send_empty_record(). It
+ * marks the end of params.
+ */
+static int fcgi_strm_send_empty_params(struct fcgi_conn *fconn, struct fcgi_strm *fstrm)
+{
+	int ret;
+
+	TRACE_POINT(FCGI_EV_TX_RECORD|FCGI_EV_TX_PARAMS, fconn->conn, fstrm);
+	ret = fcgi_strm_send_empty_record(fconn, fstrm, FCGI_PARAMS);
+	if (ret) {
+		fstrm->flags |= FCGI_SF_EP_SENT;
+		TRACE_PROTO("FCGI PARAMS record xferred", FCGI_EV_TX_RECORD|FCGI_EV_TX_STDIN, fconn->conn, fstrm, 0, (size_t[]){0});
+	}
+	return ret;
+}
+
+/* Sends an empty STDIN record. It relies on fcgi_strm_send_empty_record(). It
+ * marks the end of input. On success, all the request was successfully sent.
+ */
+static int fcgi_strm_send_empty_stdin(struct fcgi_conn *fconn, struct fcgi_strm *fstrm)
+{
+	int ret;
+
+	TRACE_POINT(FCGI_EV_TX_RECORD|FCGI_EV_TX_STDIN|FCGI_EV_TX_EOI, fconn->conn, fstrm);
+	ret = fcgi_strm_send_empty_record(fconn, fstrm, FCGI_STDIN);
+	if (ret) {
+		fstrm->flags |= FCGI_SF_ES_SENT;
+		TRACE_PROTO("FCGI STDIN record xferred", FCGI_EV_TX_RECORD|FCGI_EV_TX_STDIN, fconn->conn, fstrm, 0, (size_t[]){0});
+		TRACE_USER("FCGI request fully xferred", FCGI_EV_TX_RECORD|FCGI_EV_TX_STDIN|FCGI_EV_TX_EOI, fconn->conn, fstrm);
+		TRACE_STATE("stdin data fully sent", FCGI_EV_TX_RECORD|FCGI_EV_TX_STDIN|FCGI_EV_TX_EOI, fconn->conn, fstrm);
+	}
+	return ret;
+}
+
+/* Sends an ABORT_REQUEST record. It relies on fcgi_strm_send_empty_record(). It
+ * stops the request processing.
+ */
+static int fcgi_strm_send_abort(struct fcgi_conn *fconn, struct fcgi_strm *fstrm)
+{
+	int ret;
+
+	TRACE_POINT(FCGI_EV_TX_RECORD|FCGI_EV_TX_ABORT, fconn->conn, fstrm);
+	ret = fcgi_strm_send_empty_record(fconn, fstrm, FCGI_ABORT_REQUEST);
+	if (ret) {
+		fstrm->flags |= FCGI_SF_ABRT_SENT;
+		TRACE_PROTO("FCGI ABORT record xferred", FCGI_EV_TX_RECORD|FCGI_EV_TX_ABORT, fconn->conn, fstrm, 0, (size_t[]){0});
+		TRACE_USER("FCGI request aborted", FCGI_EV_TX_RECORD|FCGI_EV_TX_ABORT, fconn->conn, fstrm);
+		TRACE_STATE("abort sent", FCGI_EV_TX_RECORD|FCGI_EV_TX_ABORT, fconn->conn, fstrm);
+	}
+	return ret;
+}
+
+/* Sends a PARAMS record. Returns > 0 on success, 0 if it couldn't do
+ * anything. If there are too much K/V params to be encoded in a PARAMS record,
+ * several records are sent. However, a K/V param cannot be split between 2
+ * records.
+ */
+static size_t fcgi_strm_send_params(struct fcgi_conn *fconn, struct fcgi_strm *fstrm,
+				    struct htx *htx)
+{
+	struct buffer outbuf;
+	struct buffer *mbuf;
+	struct htx_blk *blk;
+	struct htx_sl *sl = NULL;
+	struct fcgi_strm_params params;
+	size_t total = 0;
+
+	TRACE_ENTER(FCGI_EV_TX_RECORD|FCGI_EV_TX_PARAMS, fconn->conn, fstrm, htx);
+
+	memset(&params, 0, sizeof(params));
+	params.p = get_trash_chunk();
+
+	mbuf = br_tail(fconn->mbuf);
+  retry:
+	if (!fcgi_get_buf(fconn, mbuf)) {
+		fconn->flags |= FCGI_CF_MUX_MALLOC;
+		fstrm->flags |= FCGI_SF_BLK_MROOM;
+		TRACE_STATE("waiting for fconn mbuf ring allocation", FCGI_EV_TX_RECORD|FCGI_EV_FSTRM_BLK|FCGI_EV_FCONN_BLK, fconn->conn, fstrm);
+		goto end;
+	}
+
+	while (1) {
+		outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
+		if (outbuf.size >= FCGI_RECORD_HEADER_SZ || !b_space_wraps(mbuf))
+			break;
+	  realign_again:
+		b_slow_realign(mbuf, trash.area, b_data(mbuf));
+	}
+
+	if (outbuf.size < FCGI_RECORD_HEADER_SZ)
+		goto full;
+
+	/* vsn: 1(FCGI_VERSION), type: (4)FCGI_PARAMS, id: fstrm->id,
+	 *  len: 0x0000 (fill later), padding: 0x00, rsv: 0x00 */
+	memcpy(outbuf.area, "\x01\x04\x00\x00\x00\x00\x00\x00", FCGI_RECORD_HEADER_SZ);
+	fcgi_set_record_id(outbuf.area, fstrm->id);
+	outbuf.data = FCGI_RECORD_HEADER_SZ;
+
+	blk = htx_get_head_blk(htx);
+	while (blk) {
+		enum htx_blk_type type;
+		uint32_t size = htx_get_blksz(blk);
+		struct fcgi_param p;
+
+		type = htx_get_blk_type(blk);
+		switch (type) {
+			case HTX_BLK_REQ_SL:
+				sl = htx_get_blk_ptr(htx, blk);
+				if (sl->info.req.meth == HTTP_METH_HEAD)
+					fstrm->h1m.flags |= H1_MF_METH_HEAD;
+				if (sl->flags & HTX_SL_F_VER_11)
+					fstrm->h1m.flags |= H1_MF_VER_11;
+				break;
+
+			case HTX_BLK_HDR:
+				p.n = htx_get_blk_name(htx, blk);
+				p.v = htx_get_blk_value(htx, blk);
+
+				if (istmatch(p.n, ist(":fcgi-"))) {
+					p.n = istadv(p.n, 6);
+					if (isteq(p.n, ist("gateway_interface")))
+						params.mask |= FCGI_SP_CGI_GATEWAY;
+					else if (isteq(p.n, ist("document_root"))) {
+						params.mask |= FCGI_SP_DOC_ROOT;
+						params.docroot = p.v;
+					}
+					else if (isteq(p.n, ist("script_name"))) {
+						params.mask |= FCGI_SP_SCRIPT_NAME;
+						params.scriptname = p.v;
+					}
+					else if (isteq(p.n, ist("path_info"))) {
+						params.mask |= FCGI_SP_PATH_INFO;
+						params.pathinfo = p.v;
+					}
+					else if (isteq(p.n, ist("request_uri"))) {
+						params.mask |= FCGI_SP_REQ_URI;
+						params.uri = p.v;
+					}
+					else if (isteq(p.n, ist("request_meth")))
+						params.mask |= FCGI_SP_REQ_METH;
+					else if (isteq(p.n, ist("query_string")))
+						params.mask |= FCGI_SP_REQ_QS;
+					else if (isteq(p.n, ist("server_name")))
+						params.mask |= FCGI_SP_SRV_NAME;
+					else if (isteq(p.n, ist("server_port")))
+						params.mask |= FCGI_SP_SRV_PORT;
+					else if (isteq(p.n, ist("server_protocol")))
+						params.mask |= FCGI_SP_SRV_PROTO;
+					else if (isteq(p.n, ist("remote_addr")))
+						params.mask |= FCGI_SP_REM_ADDR;
+					else if (isteq(p.n, ist("remote_port")))
+						params.mask |= FCGI_SP_REM_PORT;
+					else if (isteq(p.n, ist("script_filename")))
+						params.mask |= FCGI_SP_SCRIPT_FILE;
+					else if (isteq(p.n, ist("path_translated")))
+						params.mask |= FCGI_SP_PATH_TRANS;
+					else if (isteq(p.n, ist("https")))
+						params.mask |= FCGI_SP_HTTPS;
+					else if (isteq(p.n, ist("server_software")))
+						params.mask |= FCGI_SP_SRV_SOFT;
+				}
+				else if (isteq(p.n, ist("content-length"))) {
+					p.n = ist("CONTENT_LENGTH");
+					params.mask |= FCGI_SP_CONT_LEN;
+				}
+				else if (isteq(p.n, ist("content-type")))
+					p.n = ist("CONTENT_TYPE");
+				else {
+					struct ist n;
+
+					if (isteq(p.n, ist("host")))
+						params.srv_name = p.v;
+					else if (isteq(p.n, ist("te"))) {
+						/* "te" may only be sent with "trailers" if this value
+						 * is present, otherwise it must be deleted.
+						 */
+						p.v = istist(p.v, ist("trailers"));
+						if (!isttest(p.v) || (p.v.len > 8 && p.v.ptr[8] != ','))
+							break;
+						p.v = ist("trailers");
+					}
+
+					/* Skip header if same name is used to add the server name */
+					if (isttest(fconn->proxy->server_id_hdr_name) && isteq(p.n, fconn->proxy->server_id_hdr_name))
+						break;
+
+					n = ist2(trash.area, 0);
+					istcat(&n, ist("http_"), trash.size);
+					istcat(&n, p.n, trash.size);
+					p.n = n;
+				}
+
+				if (!fcgi_encode_param(&outbuf, &p)) {
+					if (b_space_wraps(mbuf))
+						goto realign_again;
+					if (outbuf.data == FCGI_RECORD_HEADER_SZ)
+						goto full;
+					goto done;
+				}
+				break;
+
+			case HTX_BLK_EOH:
+				if (isttest(fconn->proxy->server_id_hdr_name)) {
+					struct server *srv = objt_server(fconn->conn->target);
+
+					if (!srv)
+						goto done;
+
+					p.n = ist2(trash.area, 0);
+					istcat(&p.n, ist("http_"), trash.size);
+					istcat(&p.n, fconn->proxy->server_id_hdr_name, trash.size);
+					p.v = ist(srv->id);
+
+					if (!fcgi_encode_param(&outbuf, &p)) {
+						if (b_space_wraps(mbuf))
+							goto realign_again;
+						if (outbuf.data == FCGI_RECORD_HEADER_SZ)
+							goto full;
+					}
+					TRACE_STATE("add server name header", FCGI_EV_TX_RECORD|FCGI_EV_TX_PARAMS, fconn->conn, fstrm);
+				}
+				goto done;
+
+			default:
+				break;
+		}
+		total += size;
+		blk = htx_remove_blk(htx, blk);
+	}
+
+  done:
+	if (!fcgi_set_default_param(fconn, fstrm, htx, sl, &params)) {
+		TRACE_ERROR("error setting default params", FCGI_EV_TX_RECORD|FCGI_EV_STRM_ERR, fconn->conn, fstrm);
+		goto error;
+	}
+
+	if (!fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_CGI_GATEWAY) ||
+	    !fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_DOC_ROOT)    ||
+	    !fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_SCRIPT_NAME) ||
+	    !fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_PATH_INFO)   ||
+	    !fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_REQ_URI)     ||
+	    !fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_REQ_METH)    ||
+	    !fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_REQ_QS)      ||
+	    !fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_SRV_NAME)    ||
+	    !fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_SRV_PORT)    ||
+	    !fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_SRV_PROTO)   ||
+	    !fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_REM_ADDR)    ||
+	    !fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_REM_PORT)    ||
+	    !fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_SCRIPT_FILE) ||
+	    !fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_PATH_TRANS)  ||
+	    !fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_CONT_LEN)    ||
+	    !fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_SRV_SOFT)    ||
+	    !fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_HTTPS)) {
+		TRACE_ERROR("error encoding default params", FCGI_EV_TX_RECORD|FCGI_EV_STRM_ERR, fconn->conn, fstrm);
+		goto error;
+	}
+
+	/* update the record's size */
+	TRACE_PROTO("FCGI PARAMS record xferred", FCGI_EV_TX_RECORD|FCGI_EV_TX_PARAMS, fconn->conn, fstrm, 0, (size_t[]){outbuf.data - FCGI_RECORD_HEADER_SZ});
+	fcgi_set_record_size(outbuf.area, outbuf.data - FCGI_RECORD_HEADER_SZ);
+	b_add(mbuf, outbuf.data);
+
+  end:
+	TRACE_LEAVE(FCGI_EV_TX_RECORD|FCGI_EV_TX_PARAMS, fconn->conn, fstrm, htx, (size_t[]){total});
+	return total;
+  full:
+	if ((mbuf = br_tail_add(fconn->mbuf)) != NULL)
+		goto retry;
+	fconn->flags |= FCGI_CF_MUX_MFULL;
+	fstrm->flags |= FCGI_SF_BLK_MROOM;
+	TRACE_STATE("mbuf ring full", FCGI_EV_TX_RECORD|FCGI_EV_FSTRM_BLK|FCGI_EV_FCONN_BLK, fconn->conn, fstrm);
+	if (total)
+		goto error;
+	goto end;
+
+  error:
+	htx->flags |= HTX_FL_PROCESSING_ERROR;
+	TRACE_ERROR("processing error sending PARAMS record", FCGI_EV_TX_RECORD|FCGI_EV_STRM_ERR, fconn->conn, fstrm);
+	fcgi_strm_error(fstrm);
+	goto end;
+}
+
+/* Sends a STDIN record. Returns > 0 on success, 0 if it couldn't do
+ * anything. STDIN records contain the request body.
+ */
+static size_t fcgi_strm_send_stdin(struct fcgi_conn *fconn, struct fcgi_strm *fstrm,
+				   struct htx *htx, size_t count, struct buffer *buf)
+{
+	struct buffer outbuf;
+	struct buffer *mbuf;
+	struct htx_blk *blk;
+	enum htx_blk_type type;
+	uint32_t size, extra_bytes;
+	size_t total = 0;
+
+	extra_bytes = 0;
+
+	TRACE_ENTER(FCGI_EV_TX_RECORD|FCGI_EV_TX_STDIN, fconn->conn, fstrm, htx, (size_t[]){count});
+	if (!count)
+		goto end;
+
+	mbuf = br_tail(fconn->mbuf);
+  retry:
+	if (!fcgi_get_buf(fconn, mbuf)) {
+		fconn->flags |= FCGI_CF_MUX_MALLOC;
+		fstrm->flags |= FCGI_SF_BLK_MROOM;
+		TRACE_STATE("waiting for fconn mbuf ring allocation", FCGI_EV_TX_RECORD|FCGI_EV_FSTRM_BLK|FCGI_EV_FCONN_BLK, fconn->conn, fstrm);
+		goto end;
+	}
+
+	/* Perform some optimizations to reduce the number of buffer copies.
+	 * First, if the mux's buffer is empty and the htx area contains exactly
+	 * one data block of the same size as the requested count, and this
+	 * count fits within the record size, then it's possible to simply swap
+	 * the caller's buffer with the mux's output buffer and adjust offsets
+	 * and length to match the entire DATA HTX block in the middle. In this
+	 * case we perform a true zero-copy operation from end-to-end. This is
+	 * the situation that happens all the time with large files. Second, if
+	 * this is not possible, but the mux's output buffer is empty, we still
+	 * have an opportunity to avoid the copy to the intermediary buffer, by
+	 * making the intermediary buffer's area point to the output buffer's
+	 * area. In this case we want to skip the HTX header to make sure that
+	 * copies remain aligned and that this operation remains possible all
+	 * the time. This goes for headers, data blocks and any data extracted
+	 * from the HTX blocks.
+	 */
+	blk  = htx_get_head_blk(htx);
+	if (!blk)
+		goto end;
+	type = htx_get_blk_type(blk);
+	size = htx_get_blksz(blk);
+	if (unlikely(size == count && htx_nbblks(htx) == 1 && type == HTX_BLK_DATA)) {
+		void *old_area = mbuf->area;
+		int eom = (htx->flags & HTX_FL_EOM);
+
+		 /* Last block of the message: Reserve the size for the empty stdin record */
+		if (eom)
+			extra_bytes = FCGI_RECORD_HEADER_SZ;
+
+		if (b_data(mbuf)) {
+			/* Too bad there are data left there. We're willing to memcpy/memmove
+			 * up to 1/4 of the buffer, which means that it's OK to copy a large
+			 * record into a buffer containing few data if it needs to be realigned,
+			 * and that it's also OK to copy few data without realigning. Otherwise
+			 * we'll pretend the mbuf is full and wait for it to become empty.
+			 */
+			if (size + FCGI_RECORD_HEADER_SZ + extra_bytes <= b_room(mbuf) &&
+			    (b_data(mbuf) <= b_size(mbuf) / 4 ||
+			     (size <= b_size(mbuf) / 4 && size + FCGI_RECORD_HEADER_SZ + extra_bytes <= b_contig_space(mbuf))))
+				goto copy;
+			goto full;
+		}
+
+		TRACE_PROTO("sending stding data (zero-copy)", FCGI_EV_TX_RECORD|FCGI_EV_TX_STDIN, fconn->conn, fstrm, htx, (size_t[]){size});
+		/* map a FCGI record to the HTX block so that we can put the
+		 * record header there.
+		 */
+		*mbuf = b_make(buf->area, buf->size, sizeof(struct htx) + blk->addr - FCGI_RECORD_HEADER_SZ, size + FCGI_RECORD_HEADER_SZ);
+		outbuf.area = b_head(mbuf);
+
+		/* prepend a FCGI record header just before the DATA block */
+		memcpy(outbuf.area, "\x01\x05\x00\x00\x00\x00\x00\x00", FCGI_RECORD_HEADER_SZ);
+		fcgi_set_record_id(outbuf.area, fstrm->id);
+		fcgi_set_record_size(outbuf.area, size);
+
+		/* and exchange with our old area */
+		buf->area = old_area;
+		buf->data = buf->head = 0;
+		total += size;
+
+		htx = (struct htx *)buf->area;
+		htx_reset(htx);
+		if (eom)
+			goto empty_stdin;
+		goto end;
+	}
+
+  copy:
+	while (1) {
+		outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
+		if (outbuf.size >= FCGI_RECORD_HEADER_SZ + extra_bytes || !b_space_wraps(mbuf))
+			break;
+	  realign_again:
+		b_slow_realign(mbuf, trash.area, b_data(mbuf));
+	}
+
+	if (outbuf.size < FCGI_RECORD_HEADER_SZ + extra_bytes)
+		goto full;
+
+	/* vsn: 1(FCGI_VERSION), type: (5)FCGI_STDIN, id: fstrm->id,
+	 *  len: 0x0000 (fill later), padding: 0x00, rsv: 0x00 */
+	memcpy(outbuf.area, "\x01\x05\x00\x00\x00\x00\x00\x00", FCGI_RECORD_HEADER_SZ);
+	fcgi_set_record_id(outbuf.area, fstrm->id);
+	outbuf.data = FCGI_RECORD_HEADER_SZ;
+
+	blk = htx_get_head_blk(htx);
+	while (blk && count) {
+		enum htx_blk_type type = htx_get_blk_type(blk);
+		uint32_t size = htx_get_blksz(blk);
+		struct ist v;
+
+		switch (type) {
+			case HTX_BLK_DATA:
+				TRACE_PROTO("sending stding data", FCGI_EV_TX_RECORD|FCGI_EV_TX_STDIN, fconn->conn, fstrm, htx, (size_t[]){size});
+				v = htx_get_blk_value(htx, blk);
+
+				if (htx_is_unique_blk(htx, blk) && (htx->flags & HTX_FL_EOM))
+					extra_bytes = FCGI_RECORD_HEADER_SZ; /* Last block of the message */
+
+				if (v.len > count) {
+					v.len = count;
+					extra_bytes = 0;
+				}
+
+				if (v.len + FCGI_RECORD_HEADER_SZ + extra_bytes > b_room(&outbuf)) {
+					/* It doesn't fit at once. If it at least fits once split and
+					 * the amount of data to move is low, let's defragment the
+					 * buffer now.
+					 */
+					if (b_space_wraps(mbuf) &&
+					    b_data(&outbuf) + v.len + extra_bytes <= b_room(mbuf) &&
+					    b_data(mbuf) <= MAX_DATA_REALIGN)
+						goto realign_again;
+					v.len = (FCGI_RECORD_HEADER_SZ + extra_bytes > b_room(&outbuf)
+						 ? 0
+						 : b_room(&outbuf) - FCGI_RECORD_HEADER_SZ - extra_bytes);
+				}
+				if (!v.len || !chunk_memcat(&outbuf, v.ptr, v.len)) {
+					if (outbuf.data == FCGI_RECORD_HEADER_SZ)
+						goto full;
+					goto done;
+				}
+				if (v.len != size) {
+					total += v.len;
+					count -= v.len;
+					htx_cut_data_blk(htx, blk, v.len);
+					goto done;
+				}
+				break;
+
+			default:
+				break;
+		}
+		total += size;
+		count -= size;
+		blk = htx_remove_blk(htx, blk);
+	}
+
+  done:
+	/* update the record's size */
+	TRACE_PROTO("FCGI STDIN record xferred", FCGI_EV_TX_RECORD|FCGI_EV_TX_STDIN, fconn->conn, fstrm, 0, (size_t[]){outbuf.data - FCGI_RECORD_HEADER_SZ});
+	fcgi_set_record_size(outbuf.area, outbuf.data - FCGI_RECORD_HEADER_SZ);
+	b_add(mbuf, outbuf.data);
+
+	/* Send the empty stding here to finish the message */
+	if (htx_is_empty(htx) && (htx->flags & HTX_FL_EOM)) {
+	  empty_stdin:
+		TRACE_PROTO("sending FCGI STDIN record", FCGI_EV_TX_RECORD|FCGI_EV_TX_STDIN, fconn->conn, fstrm, htx);
+		if (!fcgi_strm_send_empty_stdin(fconn, fstrm)) {
+			/* bytes already reserved for this record. It should not fail */
+			htx->flags |= HTX_FL_PROCESSING_ERROR;
+			TRACE_ERROR("processing error sending empty STDIN record", FCGI_EV_TX_RECORD|FCGI_EV_STRM_ERR, fconn->conn, fstrm);
+			fcgi_strm_error(fstrm);
+		}
+	}
+
+  end:
+	TRACE_LEAVE(FCGI_EV_TX_RECORD|FCGI_EV_TX_STDIN, fconn->conn, fstrm, htx, (size_t[]){total});
+	return total;
+  full:
+	if ((mbuf = br_tail_add(fconn->mbuf)) != NULL)
+		goto retry;
+	fconn->flags |= FCGI_CF_MUX_MFULL;
+	fstrm->flags |= FCGI_SF_BLK_MROOM;
+	TRACE_STATE("mbuf ring full", FCGI_EV_TX_RECORD|FCGI_EV_FSTRM_BLK|FCGI_EV_FCONN_BLK, fconn->conn, fstrm);
+	goto end;
+}
+
+/* Processes a STDOUT record. Returns > 0 on success, 0 if it couldn't do
+ * anything. STDOUT records contain the entire response. All the content is
+ * copied in the stream's rxbuf. The parsing will be handled in fcgi_rcv_buf().
+ */
+static int fcgi_strm_handle_stdout(struct fcgi_conn *fconn, struct fcgi_strm *fstrm)
+{
+	struct buffer *dbuf;
+	size_t ret;
+	size_t max;
+
+	TRACE_ENTER(FCGI_EV_RX_RECORD|FCGI_EV_RX_STDOUT, fconn->conn, fstrm);
+
+	dbuf = &fconn->dbuf;
+
+	/* Only padding remains */
+	if (fconn->state == FCGI_CS_RECORD_P)
+		goto end_transfer;
+
+	if (b_data(dbuf) < (fconn->drl + fconn->drp) &&
+	    b_size(dbuf) > (fconn->drl + fconn->drp) &&
+	    buf_room_for_htx_data(dbuf))
+		goto fail; // incomplete record
+
+	if (!fcgi_get_buf(fconn, &fstrm->rxbuf)) {
+		fconn->flags |= FCGI_CF_DEM_SALLOC;
+		TRACE_STATE("waiting for fstrm rxbuf allocation", FCGI_EV_RX_RECORD|FCGI_EV_FSTRM_BLK, fconn->conn, fstrm);
+		goto fail;
+	}
+
+	/*max = MIN(b_room(&fstrm->rxbuf), fconn->drl);*/
+	max = buf_room_for_htx_data(&fstrm->rxbuf);
+	if (!b_data(&fstrm->rxbuf))
+		fstrm->rxbuf.head = sizeof(struct htx);
+	if (max > fconn->drl)
+		max = fconn->drl;
+
+	ret = b_xfer(&fstrm->rxbuf, dbuf, max);
+	if (!ret)
+		goto fail;
+	fconn->drl -= ret;
+	TRACE_DATA("move some data to fstrm rxbuf", FCGI_EV_RX_RECORD|FCGI_EV_RX_STDOUT, fconn->conn, fstrm, 0, (size_t[]){ret});
+	TRACE_PROTO("FCGI STDOUT record rcvd", FCGI_EV_RX_RECORD|FCGI_EV_RX_STDOUT, fconn->conn, fstrm, 0, (size_t[]){ret});
+
+	if (!buf_room_for_htx_data(&fstrm->rxbuf)) {
+		fconn->flags |= FCGI_CF_DEM_SFULL;
+		TRACE_STATE("fstrm rxbuf full", FCGI_EV_RX_RECORD|FCGI_EV_FSTRM_BLK, fconn->conn, fstrm);
+	}
+
+	if (fconn->drl)
+		goto fail;
+
+  end_transfer:
+	fconn->state = FCGI_CS_RECORD_P;
+	fconn->drl += fconn->drp;
+	fconn->drp = 0;
+	ret = MIN(b_data(&fconn->dbuf), fconn->drl);
+	b_del(&fconn->dbuf, ret);
+	fconn->drl -= ret;
+	if (fconn->drl)
+		goto fail;
+
+	fconn->state = FCGI_CS_RECORD_H;
+	TRACE_STATE("switching to RECORD_H", FCGI_EV_RX_RECORD|FCGI_EV_RX_FHDR, fconn->conn, fstrm);
+	TRACE_LEAVE(FCGI_EV_RX_RECORD|FCGI_EV_RX_STDOUT, fconn->conn, fstrm);
+	return 1;
+  fail:
+	TRACE_DEVEL("leaving on missing data or error", FCGI_EV_RX_RECORD|FCGI_EV_RX_STDOUT, fconn->conn, fstrm);
+	return 0;
+}
+
+
+/* Processes an empty STDOUT. Returns > 0 on success, 0 if it couldn't do
+ * anything. It only skip the padding in fact, there is no payload for such
+ * records. It marks the end of the response.
+ */
+static int fcgi_strm_handle_empty_stdout(struct fcgi_conn *fconn, struct fcgi_strm *fstrm)
+{
+	int ret;
+
+	TRACE_ENTER(FCGI_EV_RX_RECORD|FCGI_EV_RX_STDOUT, fconn->conn, fstrm);
+
+	fconn->state = FCGI_CS_RECORD_P;
+	TRACE_STATE("switching to RECORD_P", FCGI_EV_RX_RECORD|FCGI_EV_RX_STDOUT, fconn->conn, fstrm);
+	fconn->drl += fconn->drp;
+	fconn->drp = 0;
+	ret = MIN(b_data(&fconn->dbuf), fconn->drl);
+	b_del(&fconn->dbuf, ret);
+	fconn->drl -= ret;
+	if (fconn->drl) {
+		TRACE_DEVEL("leaving on missing data or error", FCGI_EV_RX_RECORD|FCGI_EV_RX_STDOUT, fconn->conn, fstrm);
+		return 0;
+	}
+	fconn->state = FCGI_CS_RECORD_H;
+	fstrm->flags |= FCGI_SF_ES_RCVD;
+	TRACE_PROTO("FCGI STDOUT record rcvd", FCGI_EV_RX_RECORD|FCGI_EV_RX_STDOUT, fconn->conn, fstrm, 0, (size_t[]){0});
+	TRACE_STATE("stdout data fully send, switching to RECORD_H", FCGI_EV_RX_RECORD|FCGI_EV_RX_FHDR|FCGI_EV_RX_EOI, fconn->conn, fstrm);
+	TRACE_LEAVE(FCGI_EV_RX_RECORD|FCGI_EV_RX_STDOUT, fconn->conn, fstrm);
+	return 1;
+}
+
+/* Processes a STDERR record. Returns > 0 on success, 0 if it couldn't do
+ * anything.
+ */
+static int fcgi_strm_handle_stderr(struct fcgi_conn *fconn, struct fcgi_strm *fstrm)
+{
+	struct buffer *dbuf;
+	struct buffer tag;
+	size_t ret;
+
+	TRACE_ENTER(FCGI_EV_RX_RECORD|FCGI_EV_RX_STDERR, fconn->conn, fstrm);
+	dbuf = &fconn->dbuf;
+
+	/* Only padding remains */
+	if (fconn->state == FCGI_CS_RECORD_P || !fconn->drl)
+		goto end_transfer;
+
+	if (b_data(dbuf) < (fconn->drl + fconn->drp) &&
+	    b_size(dbuf) > (fconn->drl + fconn->drp) &&
+	    buf_room_for_htx_data(dbuf))
+		goto fail; // incomplete record
+
+	chunk_reset(&trash);
+	ret = b_xfer(&trash, dbuf, MIN(b_room(&trash), fconn->drl));
+	if (!ret)
+		goto fail;
+	fconn->drl -= ret;
+	TRACE_PROTO("FCGI STDERR record rcvd", FCGI_EV_RX_RECORD|FCGI_EV_RX_STDERR, fconn->conn, fstrm, 0, (size_t[]){ret});
+
+	trash.area[ret]   = '\n';
+	trash.area[ret+1] = '\0';
+	tag.area = fconn->app->name; tag.data = strlen(fconn->app->name);
+	app_log(&fconn->app->logsrvs, &tag, LOG_ERR, "%s", trash.area);
+
+	if (fconn->drl)
+		goto fail;
+
+  end_transfer:
+	fconn->state = FCGI_CS_RECORD_P;
+	fconn->drl += fconn->drp;
+	fconn->drp = 0;
+	ret = MIN(b_data(&fconn->dbuf), fconn->drl);
+	b_del(&fconn->dbuf, ret);
+	fconn->drl -= ret;
+	if (fconn->drl)
+		goto fail;
+	fconn->state = FCGI_CS_RECORD_H;
+	TRACE_STATE("switching to RECORD_H", FCGI_EV_RX_RECORD|FCGI_EV_RX_FHDR, fconn->conn, fstrm);
+	TRACE_LEAVE(FCGI_EV_RX_RECORD|FCGI_EV_RX_STDERR, fconn->conn, fstrm);
+	return 1;
+  fail:
+	TRACE_DEVEL("leaving on missing data or error", FCGI_EV_RX_RECORD|FCGI_EV_RX_STDERR, fconn->conn, fstrm);
+	return 0;
+}
+
+/* Processes an END_REQUEST record. Returns > 0 on success, 0 if it couldn't do
+ * anything. If the empty STDOUT record is not already received, this one marks
+ * the end of the response. It is highly unexpected, but if the record is larger
+ * than a buffer and cannot be decoded in one time, an error is triggered and
+ * the connection is closed. END_REQUEST record cannot be split.
+ */
+static int fcgi_strm_handle_end_request(struct fcgi_conn *fconn, struct fcgi_strm *fstrm)
+{
+	struct buffer inbuf;
+	struct buffer *dbuf;
+	struct fcgi_end_request endreq;
+
+	TRACE_ENTER(FCGI_EV_RX_RECORD|FCGI_EV_RX_ENDREQ, fconn->conn, fstrm);
+	dbuf = &fconn->dbuf;
+
+	/* Record too large to be fully decoded */
+	if (b_size(dbuf) < (fconn->drl + fconn->drp)) {
+		TRACE_ERROR("END_REQUEST record too large", FCGI_EV_RX_RECORD|FCGI_EV_RX_ENDREQ|FCGI_EV_FSTRM_ERR, fconn->conn, fstrm);
+		goto fail;
+	}
+
+	/* process full record only */
+	if (b_data(dbuf) < (fconn->drl + fconn->drp)) {
+		TRACE_DEVEL("leaving on missing data", FCGI_EV_RX_RECORD|FCGI_EV_RX_ENDREQ, fconn->conn);
+		return 0;
+	}
+
+	if (unlikely(b_contig_data(dbuf, b_head_ofs(dbuf)) < fconn->drl)) {
+		/* Realign the dmux buffer if the record wraps. It is unexpected
+		 * at this stage because it should be the first record received
+		 * from the FCGI application.
+		 */
+		b_slow_realign_ofs(dbuf, trash.area, 0);
+	}
+
+	inbuf = b_make(b_head(dbuf), b_data(dbuf), 0, fconn->drl);
+
+	if (!fcgi_decode_end_request(&inbuf, 0, &endreq)) {
+		TRACE_ERROR("END_REQUEST record decoding failure", FCGI_EV_RX_RECORD|FCGI_EV_RX_ENDREQ|FCGI_EV_FSTRM_ERR, fconn->conn, fstrm);
+		goto fail;
+	}
+
+	fstrm->flags |= FCGI_SF_ES_RCVD;
+	TRACE_STATE("end of script reported", FCGI_EV_RX_RECORD|FCGI_EV_RX_ENDREQ|FCGI_EV_RX_EOI, fconn->conn, fstrm);
+	TRACE_PROTO("FCGI END_REQUEST record rcvd", FCGI_EV_RX_RECORD|FCGI_EV_RX_ENDREQ, fconn->conn, fstrm, 0, (size_t[]){fconn->drl});
+	fstrm->proto_status = endreq.errcode;
+	fcgi_strm_close(fstrm);
+
+	b_del(&fconn->dbuf, fconn->drl + fconn->drp);
+	fconn->drl = 0;
+	fconn->drp = 0;
+	fconn->state = FCGI_CS_RECORD_H;
+	TRACE_STATE("switching to RECORD_H", FCGI_EV_RX_RECORD|FCGI_EV_RX_FHDR, fconn->conn, fstrm);
+	TRACE_LEAVE(FCGI_EV_RX_RECORD|FCGI_EV_RX_ENDREQ, fconn->conn, fstrm);
+	return 1;
+
+  fail:
+	fcgi_strm_error(fstrm);
+	TRACE_DEVEL("leaving on error", FCGI_EV_RX_RECORD|FCGI_EV_RX_ENDREQ|FCGI_EV_FSTRM_ERR, fconn->conn, fstrm);
+	return 0;
+}
+
+/* process Rx records to be demultiplexed */
+static void fcgi_process_demux(struct fcgi_conn *fconn)
+{
+	struct fcgi_strm *fstrm = NULL, *tmp_fstrm;
+	struct fcgi_header hdr;
+	int ret;
+
+	TRACE_ENTER(FCGI_EV_FCONN_WAKE, fconn->conn);
+
+	if (fconn->state == FCGI_CS_CLOSED)
+		return;
+
+	if (unlikely(fconn->state < FCGI_CS_RECORD_H)) {
+		if (fconn->state == FCGI_CS_INIT) {
+			TRACE_STATE("waiting FCGI GET_VALUES to be sent", FCGI_EV_RX_RECORD|FCGI_EV_RX_FHDR|FCGI_EV_RX_GETVAL, fconn->conn);
+			return;
+		}
+		if (fconn->state == FCGI_CS_SETTINGS) {
+			/* ensure that what is pending is a valid GET_VALUES_RESULT record. */
+			TRACE_STATE("receiving FCGI record header", FCGI_EV_RX_RECORD|FCGI_EV_RX_FHDR, fconn->conn);
+			ret = fcgi_decode_record_hdr(&fconn->dbuf, 0, &hdr);
+			if (!ret) {
+				TRACE_ERROR("header record decoding failure", FCGI_EV_RX_RECORD|FCGI_EV_RX_ENDREQ|FCGI_EV_FSTRM_ERR, fconn->conn, fstrm);
+				goto fail;
+			}
+			b_del(&fconn->dbuf, ret);
+
+			if (hdr.id || (hdr.type != FCGI_GET_VALUES_RESULT && hdr.type != FCGI_UNKNOWN_TYPE)) {
+				fconn->state = FCGI_CS_CLOSED;
+				TRACE_ERROR("unexpected record type or flags", FCGI_EV_RX_RECORD|FCGI_EV_RX_FHDR|FCGI_EV_RX_GETVAL|FCGI_EV_FCONN_ERR, fconn->conn);
+				TRACE_STATE("switching to CLOSED", FCGI_EV_RX_RECORD|FCGI_EV_RX_FHDR|FCGI_EV_RX_GETVAL|FCGI_EV_FCONN_ERR, fconn->conn);
+				goto fail;
+			}
+			goto new_record;
+		}
+	}
+
+	/* process as many incoming records as possible below */
+	while (1) {
+		if (!b_data(&fconn->dbuf)) {
+			TRACE_DEVEL("no more Rx data", FCGI_EV_RX_RECORD, fconn->conn);
+			break;
+		}
+
+		if (fconn->state == FCGI_CS_CLOSED) {
+			TRACE_STATE("end of connection reported", FCGI_EV_RX_RECORD|FCGI_EV_RX_EOI, fconn->conn);
+			break;
+		}
+
+		if (fconn->state == FCGI_CS_RECORD_H) {
+			TRACE_PROTO("receiving FCGI record header", FCGI_EV_RX_RECORD|FCGI_EV_RX_FHDR, fconn->conn);
+			ret = fcgi_decode_record_hdr(&fconn->dbuf, 0, &hdr);
+			if (!ret)
+				break;
+			b_del(&fconn->dbuf, ret);
+
+		  new_record:
+			fconn->dsi = hdr.id;
+			fconn->drt = hdr.type;
+			fconn->drl = hdr.len;
+			fconn->drp = hdr.padding;
+			fconn->state = FCGI_CS_RECORD_D;
+			TRACE_STATE("FCGI record header rcvd, switching to RECORD_D", FCGI_EV_RX_RECORD|FCGI_EV_RX_FHDR, fconn->conn);
+		}
+
+		/* Only FCGI_CS_RECORD_D or FCGI_CS_RECORD_P */
+		tmp_fstrm = fcgi_conn_st_by_id(fconn, fconn->dsi);
+
+		if (tmp_fstrm != fstrm && fstrm && fcgi_strm_sc(fstrm) &&
+		    (b_data(&fstrm->rxbuf) ||
+		     fcgi_conn_read0_pending(fconn) ||
+		     fstrm->state == FCGI_SS_CLOSED ||
+		     (fstrm->flags & FCGI_SF_ES_RCVD) ||
+		     se_fl_test(fstrm->sd, SE_FL_ERROR | SE_FL_ERR_PENDING | SE_FL_EOS))) {
+			/* we may have to signal the upper layers */
+			TRACE_DEVEL("notifying stream before switching SID", FCGI_EV_RX_RECORD|FCGI_EV_STRM_WAKE, fconn->conn, fstrm);
+			se_fl_set(fstrm->sd, SE_FL_RCV_MORE);
+			fcgi_strm_notify_recv(fstrm);
+		}
+		fstrm = tmp_fstrm;
+
+		if (fstrm->state == FCGI_SS_CLOSED && fconn->dsi != 0) {
+			/* ignore all record for closed streams */
+			goto ignore_record;
+		}
+		if (fstrm->state == FCGI_SS_IDLE) {
+			/* ignore all record for unknown streams */
+			goto ignore_record;
+		}
+
+		switch (fconn->drt) {
+			case FCGI_GET_VALUES_RESULT:
+				TRACE_PROTO("receiving FCGI GET_VALUES_RESULT record", FCGI_EV_RX_RECORD|FCGI_EV_RX_GETVAL, fconn->conn);
+				ret = fcgi_conn_handle_values_result(fconn);
+				break;
+
+			case FCGI_STDOUT:
+				if (fstrm->flags & FCGI_SF_ES_RCVD)
+					goto ignore_record;
+
+				TRACE_PROTO("receiving FCGI STDOUT record", FCGI_EV_RX_RECORD|FCGI_EV_RX_STDOUT, fconn->conn, fstrm);
+				if (fconn->drl)
+					ret = fcgi_strm_handle_stdout(fconn, fstrm);
+				else
+					ret = fcgi_strm_handle_empty_stdout(fconn, fstrm);
+				break;
+
+			case FCGI_STDERR:
+				TRACE_PROTO("receiving FCGI STDERR record", FCGI_EV_RX_RECORD|FCGI_EV_RX_STDERR, fconn->conn, fstrm);
+				ret = fcgi_strm_handle_stderr(fconn, fstrm);
+				break;
+
+			case FCGI_END_REQUEST:
+				TRACE_PROTO("receiving FCGI END_REQUEST record", FCGI_EV_RX_RECORD|FCGI_EV_RX_ENDREQ, fconn->conn, fstrm);
+				ret = fcgi_strm_handle_end_request(fconn, fstrm);
+				break;
+
+			/* implement all extra record types here */
+			default:
+			  ignore_record:
+				/* drop records that we ignore. They may be
+				 * larger than the buffer so we drain all of
+				 * their contents until we reach the end.
+				 */
+				fconn->state = FCGI_CS_RECORD_P;
+				fconn->drl += fconn->drp;
+				fconn->drp = 0;
+				ret = MIN(b_data(&fconn->dbuf), fconn->drl);
+				TRACE_PROTO("receiving FCGI ignored record", FCGI_EV_RX_RECORD, fconn->conn, fstrm, 0, (size_t[]){ret});
+				TRACE_STATE("switching to RECORD_P", FCGI_EV_RX_RECORD, fconn->conn, fstrm);
+				b_del(&fconn->dbuf, ret);
+				fconn->drl -= ret;
+				ret = (fconn->drl == 0);
+		}
+
+		/* error or missing data condition met above ? */
+		if (ret <= 0) {
+			TRACE_DEVEL("insufficient data to proceed", FCGI_EV_RX_RECORD, fconn->conn, fstrm);
+			break;
+		}
+
+		if (fconn->state != FCGI_CS_RECORD_H && !(fconn->drl+fconn->drp)) {
+			fconn->state = FCGI_CS_RECORD_H;
+			TRACE_STATE("switching to RECORD_H", FCGI_EV_RX_RECORD|FCGI_EV_RX_FHDR, fconn->conn);
+		}
+	}
+
+ fail:
+	/* we can go here on missing data, blocked response or error */
+	if (fstrm && fcgi_strm_sc(fstrm) &&
+	    (b_data(&fstrm->rxbuf) ||
+	     fcgi_conn_read0_pending(fconn) ||
+	     fstrm->state == FCGI_SS_CLOSED ||
+	     (fstrm->flags & FCGI_SF_ES_RCVD) ||
+	     se_fl_test(fstrm->sd, SE_FL_ERROR | SE_FL_ERR_PENDING | SE_FL_EOS))) {
+		/* we may have to signal the upper layers */
+		TRACE_DEVEL("notifying stream before switching SID", FCGI_EV_RX_RECORD|FCGI_EV_STRM_WAKE, fconn->conn, fstrm);
+		se_fl_set(fstrm->sd, SE_FL_RCV_MORE);
+		fcgi_strm_notify_recv(fstrm);
+	}
+
+	fcgi_conn_restart_reading(fconn, 0);
+}
+
+/* process Tx records from streams to be multiplexed. Returns > 0 if it reached
+ * the end.
+ */
+static int fcgi_process_mux(struct fcgi_conn *fconn)
+{
+	struct fcgi_strm *fstrm, *fstrm_back;
+
+	TRACE_ENTER(FCGI_EV_FCONN_WAKE, fconn->conn);
+
+	if (unlikely(fconn->state < FCGI_CS_RECORD_H)) {
+		if (unlikely(fconn->state == FCGI_CS_INIT)) {
+			if (!(fconn->flags & FCGI_CF_GET_VALUES)) {
+				fconn->state = FCGI_CS_RECORD_H;
+				TRACE_STATE("switching to RECORD_H", FCGI_EV_TX_RECORD|FCGI_EV_RX_RECORD|FCGI_EV_RX_FHDR, fconn->conn);
+				fcgi_wake_unassigned_streams(fconn);
+				goto mux;
+			}
+			TRACE_PROTO("sending FCGI GET_VALUES record", FCGI_EV_TX_RECORD|FCGI_EV_TX_GETVAL, fconn->conn);
+			if (unlikely(!fcgi_conn_send_get_values(fconn)))
+				goto fail;
+			fconn->state = FCGI_CS_SETTINGS;
+			TRACE_STATE("switching to SETTINGS", FCGI_EV_TX_RECORD|FCGI_EV_RX_RECORD|FCGI_EV_RX_GETVAL, fconn->conn);
+		}
+		/* need to wait for the other side */
+		if (fconn->state < FCGI_CS_RECORD_H)
+			goto done;
+	}
+
+  mux:
+	list_for_each_entry_safe(fstrm, fstrm_back, &fconn->send_list, send_list) {
+		if (fconn->state == FCGI_CS_CLOSED || fconn->flags & FCGI_CF_MUX_BLOCK_ANY)
+			break;
+
+		if (fstrm->flags & FCGI_SF_NOTIFIED)
+			continue;
+
+		/* If the sender changed his mind and unsubscribed, let's just
+		 * remove the stream from the send_list.
+		 */
+		if (!(fstrm->flags & (FCGI_SF_WANT_SHUTR|FCGI_SF_WANT_SHUTW)) &&
+		    (!fstrm->subs || !(fstrm->subs->events & SUB_RETRY_SEND))) {
+			LIST_DEL_INIT(&fstrm->send_list);
+			continue;
+		}
+
+		if (fstrm->subs && fstrm->subs->events & SUB_RETRY_SEND) {
+			TRACE_POINT(FCGI_EV_STRM_WAKE, fconn->conn, fstrm);
+			fstrm->flags &= ~FCGI_SF_BLK_ANY;
+			fstrm->flags |= FCGI_SF_NOTIFIED;
+			tasklet_wakeup(fstrm->subs->tasklet);
+			fstrm->subs->events &= ~SUB_RETRY_SEND;
+			if (!fstrm->subs->events)
+				fstrm->subs = NULL;
+		} else {
+			/* it's the shut request that was queued */
+			TRACE_POINT(FCGI_EV_STRM_WAKE, fconn->conn, fstrm);
+			tasklet_wakeup(fstrm->shut_tl);
+		}
+	}
+
+ fail:
+	if (fconn->state == FCGI_CS_CLOSED) {
+		if (fconn->stream_cnt - fconn->nb_reserved > 0) {
+			fcgi_conn_send_aborts(fconn);
+			if (fconn->flags & FCGI_CF_MUX_BLOCK_ANY) {
+				TRACE_DEVEL("leaving in blocked situation", FCGI_EV_FCONN_WAKE|FCGI_EV_FCONN_BLK, fconn->conn);
+				return 0;
+			}
+		}
+	}
+
+  done:
+	TRACE_LEAVE(FCGI_EV_FCONN_WAKE, fconn->conn);
+	return 1;
+}
+
+
+/* Attempt to read data, and subscribe if none available.
+ * The function returns 1 if data has been received, otherwise zero.
+ */
+static int fcgi_recv(struct fcgi_conn *fconn)
+{
+	struct connection *conn = fconn->conn;
+	struct buffer *buf;
+	int max;
+	size_t ret;
+
+	TRACE_ENTER(FCGI_EV_FCONN_RECV, conn);
+
+	if (fconn->wait_event.events & SUB_RETRY_RECV) {
+		TRACE_DEVEL("leaving on sub_recv", FCGI_EV_FCONN_RECV, conn);
+		return (b_data(&fconn->dbuf));
+	}
+
+	if (!fcgi_recv_allowed(fconn)) {
+		TRACE_DEVEL("leaving on !recv_allowed", FCGI_EV_FCONN_RECV, conn);
+		return 1;
+	}
+
+	buf = fcgi_get_buf(fconn, &fconn->dbuf);
+	if (!buf) {
+		TRACE_DEVEL("waiting for fconn dbuf allocation", FCGI_EV_FCONN_RECV|FCGI_EV_FCONN_BLK, conn);
+		fconn->flags |= FCGI_CF_DEM_DALLOC;
+		return 0;
+	}
+
+	if (!b_data(buf)) {
+		/* try to pre-align the buffer like the
+		 * rxbufs will be to optimize memory copies. We'll make
+		 * sure that the record header lands at the end of the
+		 * HTX block to alias it upon recv. We cannot use the
+		 * head because rcv_buf() will realign the buffer if
+		 * it's empty. Thus we cheat and pretend we already
+		 * have a few bytes there.
+		 */
+		max = buf_room_for_htx_data(buf) + (fconn->state == FCGI_CS_RECORD_H ? FCGI_RECORD_HEADER_SZ : 0);
+		buf->head = sizeof(struct htx) - (fconn->state == FCGI_CS_RECORD_H ? FCGI_RECORD_HEADER_SZ : 0);
+	}
+	else
+		max = buf_room_for_htx_data(buf);
+
+	ret = max ? conn->xprt->rcv_buf(conn, conn->xprt_ctx, buf, max, 0) : 0;
+
+	if (max && !ret && fcgi_recv_allowed(fconn)) {
+		TRACE_DATA("failed to receive data, subscribing", FCGI_EV_FCONN_RECV, conn);
+		conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_RECV, &fconn->wait_event);
+	}
+	else
+		TRACE_DATA("recv data", FCGI_EV_FCONN_RECV, conn, 0, 0, (size_t[]){ret});
+
+	if (!b_data(buf)) {
+		fcgi_release_buf(fconn, &fconn->dbuf);
+		TRACE_LEAVE(FCGI_EV_FCONN_RECV, conn);
+		return (conn->flags & CO_FL_ERROR || conn_xprt_read0_pending(conn));
+	}
+
+	if (ret == max) {
+		TRACE_DEVEL("fconn dbuf full", FCGI_EV_FCONN_RECV|FCGI_EV_FCONN_BLK, conn);
+		fconn->flags |= FCGI_CF_DEM_DFULL;
+	}
+
+	TRACE_LEAVE(FCGI_EV_FCONN_RECV, conn);
+	return !!ret || (conn->flags & CO_FL_ERROR) || conn_xprt_read0_pending(conn);
+}
+
+
+/* Try to send data if possible.
+ * The function returns 1 if data have been sent, otherwise zero.
+ */
+static int fcgi_send(struct fcgi_conn *fconn)
+{
+	struct connection *conn = fconn->conn;
+	int done;
+	int sent = 0;
+
+	TRACE_ENTER(FCGI_EV_FCONN_SEND, conn);
+
+	if (conn->flags & CO_FL_ERROR) {
+		TRACE_DEVEL("leaving on connection error", FCGI_EV_FCONN_SEND, conn);
+		return 1;
+	}
+
+
+	if (conn->flags & CO_FL_WAIT_XPRT) {
+		/* a handshake was requested */
+		goto schedule;
+	}
+
+	/* This loop is quite simple : it tries to fill as much as it can from
+	 * pending streams into the existing buffer until it's reportedly full
+	 * or the end of send requests is reached. Then it tries to send this
+	 * buffer's contents out, marks it not full if at least one byte could
+	 * be sent, and tries again.
+	 *
+	 * The snd_buf() function normally takes a "flags" argument which may
+	 * be made of a combination of CO_SFL_MSG_MORE to indicate that more
+	 * data immediately comes and CO_SFL_STREAMER to indicate that the
+	 * connection is streaming lots of data (used to increase TLS record
+	 * size at the expense of latency). The former can be sent any time
+	 * there's a buffer full flag, as it indicates at least one stream
+	 * attempted to send and failed so there are pending data. An
+	 * alternative would be to set it as long as there's an active stream
+	 * but that would be problematic for ACKs until we have an absolute
+	 * guarantee that all waiters have at least one byte to send. The
+	 * latter should possibly not be set for now.
+	 */
+
+	done = 0;
+	while (!done) {
+		unsigned int flags = 0;
+		unsigned int released = 0;
+		struct buffer *buf;
+
+		/* fill as much as we can into the current buffer */
+		while (((fconn->flags & (FCGI_CF_MUX_MFULL|FCGI_CF_MUX_MALLOC)) == 0) && !done)
+			done = fcgi_process_mux(fconn);
+
+		if (fconn->flags & FCGI_CF_MUX_MALLOC)
+			done = 1; // we won't go further without extra buffers
+
+		if (conn->flags & CO_FL_ERROR)
+			break;
+
+		if (fconn->flags & (FCGI_CF_MUX_MFULL | FCGI_CF_DEM_MROOM))
+			flags |= CO_SFL_MSG_MORE;
+
+		for (buf = br_head(fconn->mbuf); b_size(buf); buf = br_del_head(fconn->mbuf)) {
+			if (b_data(buf)) {
+				int ret;
+
+				ret = conn->xprt->snd_buf(conn, conn->xprt_ctx, buf, b_data(buf), flags);
+				if (!ret) {
+					done = 1;
+					break;
+				}
+				sent = 1;
+				TRACE_DATA("send data", FCGI_EV_FCONN_SEND, conn, 0, 0, (size_t[]){ret});
+				b_del(buf, ret);
+				if (b_data(buf)) {
+					done = 1;
+					break;
+				}
+			}
+			b_free(buf);
+			released++;
+		}
+
+		if (released)
+			offer_buffers(NULL, released);
+
+		/* wrote at least one byte, the buffer is not full anymore */
+		if (fconn->flags & (FCGI_CF_MUX_MFULL | FCGI_CF_DEM_MROOM))
+			TRACE_STATE("fconn mbuf ring not fill anymore", FCGI_EV_FCONN_SEND|FCGI_EV_FCONN_BLK, conn);
+		fconn->flags &= ~(FCGI_CF_MUX_MFULL | FCGI_CF_DEM_MROOM);
+	}
+
+	if (conn->flags & CO_FL_SOCK_WR_SH) {
+		/* output closed, nothing to send, clear the buffer to release it */
+		b_reset(br_tail(fconn->mbuf));
+	}
+	/* We're not full anymore, so we can wake any task that are waiting
+	 * for us.
+	 */
+	if (!(fconn->flags & (FCGI_CF_MUX_MFULL | FCGI_CF_DEM_MROOM)) && fconn->state >= FCGI_CS_RECORD_H) {
+		struct fcgi_strm *fstrm;
+
+		list_for_each_entry(fstrm, &fconn->send_list, send_list) {
+			if (fconn->state == FCGI_CS_CLOSED || fconn->flags & FCGI_CF_MUX_BLOCK_ANY)
+				break;
+
+			if (fstrm->flags & FCGI_SF_NOTIFIED)
+				continue;
+
+			/* If the sender changed his mind and unsubscribed, let's just
+			 * remove the stream from the send_list.
+			 */
+			if (!(fstrm->flags & (FCGI_SF_WANT_SHUTR|FCGI_SF_WANT_SHUTW)) &&
+			    (!fstrm->subs || !(fstrm->subs->events & SUB_RETRY_SEND))) {
+				LIST_DEL_INIT(&fstrm->send_list);
+				continue;
+			}
+
+			if (fstrm->subs && fstrm->subs->events & SUB_RETRY_SEND) {
+				TRACE_DEVEL("waking up pending stream", FCGI_EV_FCONN_SEND|FCGI_EV_STRM_WAKE, conn, fstrm);
+				fstrm->flags &= ~FCGI_SF_BLK_ANY;
+				fstrm->flags |= FCGI_SF_NOTIFIED;
+				tasklet_wakeup(fstrm->subs->tasklet);
+				fstrm->subs->events &= ~SUB_RETRY_SEND;
+				if (!fstrm->subs->events)
+					fstrm->subs = NULL;
+			} else {
+				/* it's the shut request that was queued */
+				TRACE_POINT(FCGI_EV_STRM_WAKE, fconn->conn, fstrm);
+				tasklet_wakeup(fstrm->shut_tl);
+			}
+		}
+	}
+	/* We're done, no more to send */
+	if (!br_data(fconn->mbuf)) {
+		TRACE_DEVEL("leaving with everything sent", FCGI_EV_FCONN_SEND, conn);
+		return sent;
+	}
+schedule:
+	if (!(conn->flags & CO_FL_ERROR) && !(fconn->wait_event.events & SUB_RETRY_SEND)) {
+		TRACE_STATE("more data to send, subscribing", FCGI_EV_FCONN_SEND, conn);
+		conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_SEND, &fconn->wait_event);
+	}
+
+	TRACE_DEVEL("leaving with some data left to send", FCGI_EV_FCONN_SEND, conn);
+	return sent;
+}
+
+/* this is the tasklet referenced in fconn->wait_event.tasklet */
+struct task *fcgi_io_cb(struct task *t, void *ctx, unsigned int state)
+{
+	struct connection *conn;
+	struct fcgi_conn *fconn = ctx;
+	struct tasklet *tl = (struct tasklet *)t;
+	int conn_in_list;
+	int ret = 0;
+
+	if (state & TASK_F_USR1) {
+		/* the tasklet was idling on an idle connection, it might have
+		 * been stolen, let's be careful!
+		 */
+		HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
+		if (tl->context == NULL) {
+			/* The connection has been taken over by another thread,
+			 * we're no longer responsible for it, so just free the
+			 * tasklet, and do nothing.
+			 */
+			HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
+			tasklet_free(tl);
+			return NULL;
+		}
+		conn = fconn->conn;
+		TRACE_POINT(FCGI_EV_FCONN_WAKE, conn);
+
+		conn_in_list = conn_get_idle_flag(conn);
+		if (conn_in_list)
+			conn_delete_from_tree(&conn->hash_node->node);
+
+		HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
+	} else {
+		/* we're certain the connection was not in an idle list */
+		conn = fconn->conn;
+		TRACE_ENTER(FCGI_EV_FCONN_WAKE, conn);
+		conn_in_list = 0;
+	}
+
+	if (!(fconn->wait_event.events & SUB_RETRY_SEND))
+		ret = fcgi_send(fconn);
+	if (!(fconn->wait_event.events & SUB_RETRY_RECV))
+		ret |= fcgi_recv(fconn);
+	if (ret || b_data(&fconn->dbuf))
+		ret = fcgi_process(fconn);
+
+	/* If we were in an idle list, we want to add it back into it,
+	 * unless fcgi_process() returned -1, which mean it has destroyed
+	 * the connection (testing !ret is enough, if fcgi_process() wasn't
+	 * called then ret will be 0 anyway.
+	 */
+	if (ret < 0)
+		t = NULL;
+
+	if (!ret && conn_in_list) {
+		struct server *srv = objt_server(conn->target);
+
+		HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
+		if (conn_in_list == CO_FL_SAFE_LIST)
+			eb64_insert(&srv->per_thr[tid].safe_conns, &conn->hash_node->node);
+		else
+			eb64_insert(&srv->per_thr[tid].idle_conns, &conn->hash_node->node);
+		HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
+	}
+	return t;
+}
+
+/* callback called on any event by the connection handler.
+ * It applies changes and returns zero, or < 0 if it wants immediate
+ * destruction of the connection (which normally doesn not happen in FCGI).
+ */
+static int fcgi_process(struct fcgi_conn *fconn)
+{
+	struct connection *conn = fconn->conn;
+
+	TRACE_POINT(FCGI_EV_FCONN_WAKE, conn);
+
+	if (b_data(&fconn->dbuf) && !(fconn->flags & FCGI_CF_DEM_BLOCK_ANY)) {
+		fcgi_process_demux(fconn);
+
+		if (fconn->state == FCGI_CS_CLOSED || conn->flags & CO_FL_ERROR)
+			b_reset(&fconn->dbuf);
+
+		if (buf_room_for_htx_data(&fconn->dbuf))
+			fconn->flags &= ~FCGI_CF_DEM_DFULL;
+	}
+	fcgi_send(fconn);
+
+	if (unlikely(fconn->proxy->flags & (PR_FL_DISABLED|PR_FL_STOPPED))) {
+		/* frontend is stopping, reload likely in progress, let's try
+		 * to announce a graceful shutdown if not yet done. We don't
+		 * care if it fails, it will be tried again later.
+		 */
+		TRACE_STATE("proxy stopped, sending ABORT to all streams", FCGI_EV_FCONN_WAKE|FCGI_EV_TX_RECORD, conn);
+		if (!(fconn->flags & (FCGI_CF_ABRTS_SENT|FCGI_CF_ABRTS_FAILED))) {
+			if (fconn->stream_cnt - fconn->nb_reserved > 0)
+				fcgi_conn_send_aborts(fconn);
+		}
+	}
+
+	/*
+	 * If we received early data, and the handshake is done, wake
+	 * any stream that was waiting for it.
+	 */
+	if (!(fconn->flags & FCGI_CF_WAIT_FOR_HS) &&
+	    (conn->flags & (CO_FL_EARLY_SSL_HS | CO_FL_WAIT_XPRT | CO_FL_EARLY_DATA)) == CO_FL_EARLY_DATA) {
+		struct eb32_node *node;
+		struct fcgi_strm *fstrm;
+
+		fconn->flags |= FCGI_CF_WAIT_FOR_HS;
+		node = eb32_lookup_ge(&fconn->streams_by_id, 1);
+
+		while (node) {
+			fstrm = container_of(node, struct fcgi_strm, by_id);
+			if (fcgi_strm_sc(fstrm) && se_fl_test(fstrm->sd, SE_FL_WAIT_FOR_HS))
+				fcgi_strm_notify_recv(fstrm);
+			node = eb32_next(node);
+		}
+	}
+
+	if ((conn->flags & CO_FL_ERROR) || fcgi_conn_read0_pending(fconn) ||
+	    fconn->state == FCGI_CS_CLOSED || (fconn->flags & FCGI_CF_ABRTS_FAILED) ||
+	    eb_is_empty(&fconn->streams_by_id)) {
+		fcgi_wake_some_streams(fconn, 0);
+
+		if (eb_is_empty(&fconn->streams_by_id)) {
+			/* no more stream, kill the connection now */
+			fcgi_release(fconn);
+			TRACE_DEVEL("leaving after releasing the connection", FCGI_EV_FCONN_WAKE);
+			return -1;
+		}
+	}
+
+	if (!b_data(&fconn->dbuf))
+		fcgi_release_buf(fconn, &fconn->dbuf);
+
+	if ((conn->flags & CO_FL_SOCK_WR_SH) ||
+	    fconn->state == FCGI_CS_CLOSED  || (fconn->flags & FCGI_CF_ABRTS_FAILED) ||
+	    (!br_data(fconn->mbuf) && ((fconn->flags & FCGI_CF_MUX_BLOCK_ANY) || LIST_ISEMPTY(&fconn->send_list))))
+		fcgi_release_mbuf(fconn);
+
+	if (fconn->task) {
+		fconn->task->expire = tick_add(now_ms, (fconn->state == FCGI_CS_CLOSED ? fconn->shut_timeout : fconn->timeout));
+		task_queue(fconn->task);
+	}
+
+	fcgi_send(fconn);
+	TRACE_LEAVE(FCGI_EV_FCONN_WAKE, conn);
+	return 0;
+}
+
+
+/* wake-up function called by the connection layer (mux_ops.wake) */
+static int fcgi_wake(struct connection *conn)
+{
+	struct fcgi_conn *fconn = conn->ctx;
+
+	TRACE_POINT(FCGI_EV_FCONN_WAKE, conn);
+	return (fcgi_process(fconn));
+}
+
+
+static int fcgi_ctl(struct connection *conn, enum mux_ctl_type mux_ctl, void *output)
+{
+	int ret = 0;
+	switch (mux_ctl) {
+	case MUX_STATUS:
+		if (!(conn->flags & CO_FL_WAIT_XPRT))
+			ret |= MUX_STATUS_READY;
+		return ret;
+	case MUX_EXIT_STATUS:
+		return MUX_ES_UNKNOWN;
+	default:
+		return -1;
+	}
+}
+
+/* Connection timeout management. The principle is that if there's no receipt
+ * nor sending for a certain amount of time, the connection is closed. If the
+ * MUX buffer still has lying data or is not allocatable, the connection is
+ * immediately killed. If it's allocatable and empty, we attempt to send a
+ * ABORT records.
+ */
+struct task *fcgi_timeout_task(struct task *t, void *context, unsigned int state)
+{
+	struct fcgi_conn *fconn = context;
+	int expired = tick_is_expired(t->expire, now_ms);
+
+	TRACE_ENTER(FCGI_EV_FCONN_WAKE, (fconn ? fconn->conn : NULL));
+
+	if (fconn) {
+		HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
+
+		/* Somebody already stole the connection from us, so we should not
+		 * free it, we just have to free the task.
+		 */
+		if (!t->context) {
+			HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
+			fconn = NULL;
+			goto do_leave;
+		}
+
+		if (!expired) {
+			HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
+			TRACE_DEVEL("leaving (not expired)", FCGI_EV_FCONN_WAKE, fconn->conn);
+			return t;
+		}
+
+		/* We're about to destroy the connection, so make sure nobody attempts
+		 * to steal it from us.
+		 */
+		if (fconn->conn->flags & CO_FL_LIST_MASK)
+			conn_delete_from_tree(&fconn->conn->hash_node->node);
+
+		HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
+	}
+
+do_leave:
+	task_destroy(t);
+
+	if (!fconn) {
+		/* resources were already deleted */
+		TRACE_DEVEL("leaving (not more fconn)", FCGI_EV_FCONN_WAKE);
+		return NULL;
+	}
+
+	fconn->task = NULL;
+	fconn->state = FCGI_CS_CLOSED;
+	fcgi_wake_some_streams(fconn, 0);
+
+	if (br_data(fconn->mbuf)) {
+		/* don't even try to send aborts, the buffer is stuck */
+		fconn->flags |= FCGI_CF_ABRTS_FAILED;
+		goto end;
+	}
+
+	/* try to send but no need to insist */
+	if (!fcgi_conn_send_aborts(fconn))
+		fconn->flags |= FCGI_CF_ABRTS_FAILED;
+
+	if (br_data(fconn->mbuf) && !(fconn->flags & FCGI_CF_ABRTS_FAILED) &&
+	    conn_xprt_ready(fconn->conn)) {
+		unsigned int released = 0;
+		struct buffer *buf;
+
+		for (buf = br_head(fconn->mbuf); b_size(buf); buf = br_del_head(fconn->mbuf)) {
+			if (b_data(buf)) {
+				int ret = fconn->conn->xprt->snd_buf(fconn->conn, fconn->conn->xprt_ctx,
+								     buf, b_data(buf), 0);
+				if (!ret)
+					break;
+				b_del(buf, ret);
+				if (b_data(buf))
+					break;
+				b_free(buf);
+				released++;
+			}
+		}
+
+		if (released)
+			offer_buffers(NULL, released);
+	}
+
+  end:
+	/* either we can release everything now or it will be done later once
+	 * the last stream closes.
+	 */
+	if (eb_is_empty(&fconn->streams_by_id))
+		fcgi_release(fconn);
+
+	TRACE_LEAVE(FCGI_EV_FCONN_WAKE);
+	return NULL;
+}
+
+
+/*******************************************/
+/* functions below are used by the streams */
+/*******************************************/
+
+/* Append the description of what is present in error snapshot <es> into <out>.
+ * The description must be small enough to always fit in a buffer. The output
+ * buffer may be the trash so the trash must not be used inside this function.
+ */
+static void fcgi_show_error_snapshot(struct buffer *out, const struct error_snapshot *es)
+{
+	chunk_appendf(out,
+		      "  FCGI connection flags 0x%08x, FCGI stream flags 0x%08x\n"
+		      "  H1 msg state %s(%d), H1 msg flags 0x%08x\n"
+		      "  H1 chunk len %lld bytes, H1 body len %lld bytes :\n",
+		      es->ctx.h1.c_flags, es->ctx.h1.s_flags,
+		      h1m_state_str(es->ctx.h1.state), es->ctx.h1.state,
+		      es->ctx.h1.m_flags, es->ctx.h1.m_clen, es->ctx.h1.m_blen);
+}
+/*
+ * Capture a bad response and archive it in the proxy's structure.  By default
+ * it tries to report the error position as h1m->err_pos. However if this one is
+ * not set, it will then report h1m->next, which is the last known parsing
+ * point. The function is able to deal with wrapping buffers. It always displays
+ * buffers as a contiguous area starting at buf->p. The direction is determined
+ * thanks to the h1m's flags.
+ */
+static void fcgi_strm_capture_bad_message(struct fcgi_conn *fconn, struct fcgi_strm *fstrm,
+					  struct h1m *h1m, struct buffer *buf)
+{
+	struct session *sess = fstrm->sess;
+	struct proxy *proxy = fconn->proxy;
+	struct proxy *other_end;
+	union error_snapshot_ctx ctx;
+
+	if (fcgi_strm_sc(fstrm) && sc_strm(fcgi_strm_sc(fstrm))) {
+		if (sess == NULL)
+			sess = __sc_strm(fcgi_strm_sc(fstrm))->sess;
+		if (!(h1m->flags & H1_MF_RESP))
+			other_end = __sc_strm(fcgi_strm_sc(fstrm))->be;
+		else
+			other_end = sess->fe;
+	} else
+		other_end = NULL;
+	/* http-specific part now */
+	ctx.h1.state   = h1m->state;
+	ctx.h1.c_flags = fconn->flags;
+	ctx.h1.s_flags = fstrm->flags;
+	ctx.h1.m_flags = h1m->flags;
+	ctx.h1.m_clen  = h1m->curr_len;
+	ctx.h1.m_blen  = h1m->body_len;
+
+	proxy_capture_error(proxy, 1, other_end, fconn->conn->target, sess, buf, 0, 0,
+			    (h1m->err_pos >= 0) ? h1m->err_pos : h1m->next,
+			    &ctx, fcgi_show_error_snapshot);
+}
+
+static size_t fcgi_strm_parse_headers(struct fcgi_strm *fstrm, struct h1m *h1m, struct htx *htx,
+				      struct buffer *buf, size_t *ofs, size_t max)
+{
+	int ret;
+
+	TRACE_ENTER(FCGI_EV_RSP_DATA|FCGI_EV_RSP_HDRS, fstrm->fconn->conn, fstrm, 0, (size_t[]){max});
+	ret = h1_parse_msg_hdrs(h1m, NULL, htx, buf, *ofs, max);
+	if (ret <= 0) {
+		TRACE_DEVEL("leaving on missing data or error", FCGI_EV_RSP_DATA|FCGI_EV_RSP_HDRS, fstrm->fconn->conn, fstrm);
+		if (htx->flags & HTX_FL_PARSING_ERROR) {
+			TRACE_ERROR("parsing error, reject H1 response", FCGI_EV_RSP_DATA|FCGI_EV_RSP_HDRS|FCGI_EV_FSTRM_ERR, fstrm->fconn->conn, fstrm);
+			fcgi_strm_error(fstrm);
+			fcgi_strm_capture_bad_message(fstrm->fconn, fstrm, h1m, buf);
+		}
+		ret = 0;
+		goto end;
+	}
+
+	/* Reject any message with an unknown transfer-encoding. In fact if any
+	 * encoding other than "chunked". A 422-Unprocessable-Content is
+	 * returned for an invalid request, a 502-Bad-Gateway for an invalid
+	 * response.
+	 */
+	if (h1m->flags & H1_MF_TE_OTHER) {
+		htx->flags |= HTX_FL_PARSING_ERROR;
+		TRACE_ERROR("Unknown transfer-encoding", FCGI_EV_RSP_DATA|FCGI_EV_RSP_HDRS|FCGI_EV_FSTRM_ERR, fstrm->fconn->conn, fstrm);
+		fcgi_strm_error(fstrm);
+		fcgi_strm_capture_bad_message(fstrm->fconn, fstrm, h1m, buf);
+		ret = 0;
+		goto end;
+	}
+
+	*ofs += ret;
+  end:
+	TRACE_LEAVE(FCGI_EV_RSP_DATA|FCGI_EV_RSP_HDRS, fstrm->fconn->conn, fstrm, 0, (size_t[]){ret});
+	return ret;
+
+}
+
+static size_t fcgi_strm_parse_data(struct fcgi_strm *fstrm, struct h1m *h1m, struct htx **htx,
+				   struct buffer *buf, size_t *ofs, size_t max, struct buffer *htxbuf)
+{
+	size_t ret;
+
+	TRACE_ENTER(FCGI_EV_RSP_DATA|FCGI_EV_RSP_BODY, fstrm->fconn->conn, fstrm, 0, (size_t[]){max});
+	ret = h1_parse_msg_data(h1m, htx, buf, *ofs, max, htxbuf);
+	if (!ret) {
+		TRACE_DEVEL("leaving on missing data or error", FCGI_EV_RSP_DATA|FCGI_EV_RSP_BODY, fstrm->fconn->conn, fstrm);
+		if ((*htx)->flags & HTX_FL_PARSING_ERROR) {
+			TRACE_ERROR("parsing error, reject H1 response", FCGI_EV_RSP_DATA|FCGI_EV_RSP_BODY|FCGI_EV_FSTRM_ERR, fstrm->fconn->conn, fstrm);
+			fcgi_strm_error(fstrm);
+			fcgi_strm_capture_bad_message(fstrm->fconn, fstrm, h1m, buf);
+		}
+		goto end;
+	}
+	*ofs += ret;
+  end:
+	TRACE_LEAVE(FCGI_EV_RSP_DATA|FCGI_EV_RSP_BODY, fstrm->fconn->conn, fstrm, 0, (size_t[]){ret});
+	return ret;
+}
+
+static size_t fcgi_strm_parse_trailers(struct fcgi_strm *fstrm, struct h1m *h1m, struct htx *htx,
+				       struct buffer *buf, size_t *ofs, size_t max)
+{
+	int ret;
+
+	TRACE_ENTER(FCGI_EV_RSP_DATA|FCGI_EV_RSP_TLRS, fstrm->fconn->conn, fstrm, 0, (size_t[]){max});
+	ret = h1_parse_msg_tlrs(h1m, htx, buf, *ofs, max);
+	if (ret <= 0) {
+		TRACE_DEVEL("leaving on missing data or error", FCGI_EV_RSP_DATA|FCGI_EV_RSP_TLRS, fstrm->fconn->conn, fstrm);
+		if (htx->flags & HTX_FL_PARSING_ERROR) {
+			TRACE_ERROR("parsing error, reject H1 response", FCGI_EV_RSP_DATA|FCGI_EV_RSP_TLRS|FCGI_EV_FSTRM_ERR, fstrm->fconn->conn, fstrm);
+			fcgi_strm_error(fstrm);
+			fcgi_strm_capture_bad_message(fstrm->fconn, fstrm, h1m, buf);
+		}
+		ret = 0;
+		goto end;
+	}
+	*ofs += ret;
+  end:
+	TRACE_LEAVE(FCGI_EV_RSP_DATA|FCGI_EV_RSP_TLRS, fstrm->fconn->conn, fstrm, 0, (size_t[]){ret});
+	return ret;
+}
+
+static size_t fcgi_strm_parse_response(struct fcgi_strm *fstrm, struct buffer *buf, size_t count)
+{
+	struct fcgi_conn *fconn = fstrm->fconn;
+	struct htx *htx;
+	struct h1m *h1m = &fstrm->h1m;
+	size_t ret, data, total = 0;
+
+	htx = htx_from_buf(buf);
+	TRACE_ENTER(FCGI_EV_RSP_DATA, fconn->conn, fstrm, htx, (size_t[]){count});
+
+	data = htx->data;
+	if (fstrm->state == FCGI_SS_ERROR)
+		goto end;
+
+	do {
+		size_t used = htx_used_space(htx);
+
+		if (h1m->state <= H1_MSG_LAST_LF) {
+			TRACE_PROTO("parsing response headers", FCGI_EV_RSP_DATA|FCGI_EV_RSP_HDRS, fconn->conn, fstrm);
+			ret = fcgi_strm_parse_headers(fstrm, h1m, htx, &fstrm->rxbuf, &total, count);
+			if (!ret)
+				break;
+
+			TRACE_USER("rcvd H1 response headers", FCGI_EV_RSP_DATA|FCGI_EV_RSP_HDRS, fconn->conn, fstrm, htx);
+
+			if ((h1m->flags & (H1_MF_VER_11|H1_MF_XFER_LEN)) == H1_MF_VER_11) {
+				struct htx_blk *blk = htx_get_head_blk(htx);
+				struct htx_sl *sl;
+
+				if (!blk)
+					break;
+				sl = htx_get_blk_ptr(htx, blk);
+				sl->flags |= HTX_SL_F_XFER_LEN;
+				htx->extra = 0;
+			}
+		}
+		else if (h1m->state < H1_MSG_TRAILERS) {
+			TRACE_PROTO("parsing response payload", FCGI_EV_RSP_DATA|FCGI_EV_RSP_BODY, fconn->conn, fstrm);
+			fcgi_strm_parse_data(fstrm, h1m, &htx, &fstrm->rxbuf, &total, count, buf);
+
+			if (!(h1m->flags & H1_MF_XFER_LEN) && fstrm->state != FCGI_SS_ERROR &&
+			    (fstrm->flags & FCGI_SF_ES_RCVD) && b_data(&fstrm->rxbuf) == total) {
+				TRACE_DEVEL("end of data", FCGI_EV_RSP_DATA, fconn->conn, fstrm);
+				if (htx_is_empty(htx) && !htx_add_endof(htx, HTX_BLK_EOT))
+					break;
+				htx->flags |= HTX_FL_EOM;
+				h1m->state = H1_MSG_DONE;
+				TRACE_USER("H1 response fully rcvd", FCGI_EV_RSP_DATA|FCGI_EV_RSP_EOM, fconn->conn, fstrm, htx);
+			}
+
+			if (h1m->state < H1_MSG_TRAILERS)
+				break;
+
+			TRACE_PROTO("rcvd response payload data", FCGI_EV_RSP_DATA|FCGI_EV_RSP_BODY, fconn->conn, fstrm, htx);
+		}
+		else if (h1m->state == H1_MSG_TRAILERS) {
+			TRACE_PROTO("parsing response trailers", FCGI_EV_RSP_DATA|FCGI_EV_RSP_TLRS, fconn->conn, fstrm);
+			fcgi_strm_parse_trailers(fstrm, h1m, htx, &fstrm->rxbuf, &total, count);
+			if (h1m->state != H1_MSG_DONE)
+				break;
+
+			TRACE_PROTO("rcvd H1 response trailers", FCGI_EV_RSP_DATA|FCGI_EV_RSP_TLRS, fconn->conn, fstrm, htx);
+		}
+		else if (h1m->state == H1_MSG_DONE) {
+			TRACE_USER("H1 response fully rcvd", FCGI_EV_RSP_DATA|FCGI_EV_RSP_EOM, fconn->conn, fstrm, htx);
+			if (b_data(&fstrm->rxbuf) > total) {
+				htx->flags |= HTX_FL_PARSING_ERROR;
+				TRACE_PROTO("too much data, parsing error", FCGI_EV_RSP_DATA, fconn->conn, fstrm);
+				fcgi_strm_error(fstrm);
+			}
+			break;
+		}
+		else {
+			htx->flags |= HTX_FL_PROCESSING_ERROR;
+			TRACE_ERROR("unexpected processing error", FCGI_EV_RSP_DATA|FCGI_EV_STRM_ERR, fconn->conn, fstrm);
+			fcgi_strm_error(fstrm);
+			break;
+		}
+
+		count -= htx_used_space(htx) - used;
+	} while (fstrm->state != FCGI_SS_ERROR);
+
+	if (fstrm->state == FCGI_SS_ERROR) {
+		b_reset(&fstrm->rxbuf);
+		htx_to_buf(htx, buf);
+		TRACE_DEVEL("leaving on error", FCGI_EV_RSP_DATA|FCGI_EV_STRM_ERR, fconn->conn, fstrm);
+		return 0;
+	}
+
+	b_del(&fstrm->rxbuf, total);
+
+  end:
+	htx_to_buf(htx, buf);
+	ret = htx->data - data;
+	TRACE_LEAVE(FCGI_EV_RSP_DATA, fconn->conn, fstrm, htx, (size_t[]){ret});
+	return ret;
+}
+
+/*
+ * Attach a new stream to a connection
+ * (Used for outgoing connections)
+ */
+static int fcgi_attach(struct connection *conn, struct sedesc *sd, struct session *sess)
+{
+	struct fcgi_strm *fstrm;
+	struct fcgi_conn *fconn = conn->ctx;
+
+	TRACE_ENTER(FCGI_EV_FSTRM_NEW, conn);
+	fstrm = fcgi_stconn_new(fconn, sd->sc, sess);
+	if (!fstrm)
+		goto err;
+
+	/* the connection is not idle anymore, let's mark this */
+	HA_ATOMIC_AND(&fconn->wait_event.tasklet->state, ~TASK_F_USR1);
+	xprt_set_used(conn, conn->xprt, conn->xprt_ctx);
+
+	TRACE_LEAVE(FCGI_EV_FSTRM_NEW, conn, fstrm);
+	return 0;
+
+  err:
+	TRACE_DEVEL("leaving on error", FCGI_EV_FSTRM_NEW|FCGI_EV_FSTRM_ERR, conn);
+	return -1;
+}
+
+/* Retrieves the first valid stream connector from this connection, or returns NULL.
+ * We have to scan because we may have some orphan streams. It might be
+ * beneficial to scan backwards from the end to reduce the likeliness to find
+ * orphans.
+ */
+static struct stconn *fcgi_get_first_sc(const struct connection *conn)
+{
+	struct fcgi_conn *fconn = conn->ctx;
+	struct fcgi_strm *fstrm;
+	struct eb32_node *node;
+
+	node = eb32_first(&fconn->streams_by_id);
+	while (node) {
+		fstrm = container_of(node, struct fcgi_strm, by_id);
+		if (fcgi_strm_sc(fstrm))
+			return fcgi_strm_sc(fstrm);
+		node = eb32_next(node);
+	}
+	return NULL;
+}
+
+/*
+ * Destroy the mux and the associated connection, if it is no longer used
+ */
+static void fcgi_destroy(void *ctx)
+{
+	struct fcgi_conn *fconn = ctx;
+
+	TRACE_POINT(FCGI_EV_FCONN_END, fconn->conn);
+	if (eb_is_empty(&fconn->streams_by_id)) {
+		BUG_ON(fconn->conn->ctx != fconn);
+		fcgi_release(fconn);
+	}
+}
+
+/*
+ * Detach the stream from the connection and possibly release the connection.
+ */
+static void fcgi_detach(struct sedesc *sd)
+{
+	struct fcgi_strm *fstrm = sd->se;
+	struct fcgi_conn *fconn;
+	struct session *sess;
+
+	TRACE_ENTER(FCGI_EV_STRM_END, (fstrm ? fstrm->fconn->conn : NULL), fstrm);
+
+	if (!fstrm) {
+		TRACE_LEAVE(FCGI_EV_STRM_END);
+		return;
+	}
+
+	/* there's no txbuf so we're certain no to be able to send anything */
+	fstrm->flags &= ~FCGI_SF_NOTIFIED;
+
+	sess = fstrm->sess;
+	fconn = fstrm->fconn;
+	fconn->nb_sc--;
+
+	if (fstrm->proto_status == FCGI_PS_CANT_MPX_CONN) {
+		fconn->flags &= ~FCGI_CF_MPXS_CONNS;
+		fconn->streams_limit = 1;
+	}
+	else if (fstrm->proto_status == FCGI_PS_OVERLOADED ||
+		 fstrm->proto_status == FCGI_PS_UNKNOWN_ROLE) {
+		fconn->flags &= ~FCGI_CF_KEEP_CONN;
+		fconn->state = FCGI_CS_CLOSED;
+	}
+
+	/* this stream may be blocked waiting for some data to leave, so orphan
+	 * it in this case.
+	 */
+	if (!(fconn->conn->flags & CO_FL_ERROR) &&
+	    (fconn->state != FCGI_CS_CLOSED) &&
+	    (fstrm->flags & (FCGI_SF_BLK_MBUSY|FCGI_SF_BLK_MROOM)) &&
+	    (fstrm->subs || (fstrm->flags & (FCGI_SF_WANT_SHUTR|FCGI_SF_WANT_SHUTW)))) {
+		TRACE_DEVEL("leaving on stream blocked", FCGI_EV_STRM_END|FCGI_EV_FSTRM_BLK, fconn->conn, fstrm);
+		return;
+	}
+
+	if ((fconn->flags & FCGI_CF_DEM_BLOCK_ANY && fstrm->id == fconn->dsi)) {
+		/* unblock the connection if it was blocked on this stream. */
+		fconn->flags &= ~FCGI_CF_DEM_BLOCK_ANY;
+		fcgi_conn_restart_reading(fconn, 1);
+	}
+
+	fcgi_strm_destroy(fstrm);
+
+	if (!(fconn->conn->flags & (CO_FL_ERROR|CO_FL_SOCK_RD_SH|CO_FL_SOCK_WR_SH)) &&
+	    (fconn->flags & FCGI_CF_KEEP_CONN)) {
+		if (fconn->conn->flags & CO_FL_PRIVATE) {
+			/* Add the connection in the session serverlist, if not already done */
+			if (!session_add_conn(sess, fconn->conn, fconn->conn->target)) {
+				fconn->conn->owner = NULL;
+				if (eb_is_empty(&fconn->streams_by_id)) {
+					/* let's kill the connection right away */
+					fconn->conn->mux->destroy(fconn);
+					TRACE_DEVEL("outgoing connection killed", FCGI_EV_STRM_END|FCGI_EV_FCONN_ERR);
+					return;
+				}
+			}
+			if (eb_is_empty(&fconn->streams_by_id)) {
+				if (session_check_idle_conn(fconn->conn->owner, fconn->conn) != 0) {
+					/* The connection is destroyed, let's leave */
+					TRACE_DEVEL("outgoing connection killed", FCGI_EV_STRM_END|FCGI_EV_FCONN_ERR);
+					return;
+				}
+			}
+		}
+		else {
+			if (eb_is_empty(&fconn->streams_by_id)) {
+				/* If the connection is owned by the session, first remove it
+				 * from its list
+				 */
+				if (fconn->conn->owner) {
+					session_unown_conn(fconn->conn->owner, fconn->conn);
+					fconn->conn->owner = NULL;
+				}
+
+				/* mark that the tasklet may lose its context to another thread and
+				 * that the handler needs to check it under the idle conns lock.
+				 */
+				HA_ATOMIC_OR(&fconn->wait_event.tasklet->state, TASK_F_USR1);
+				xprt_set_idle(fconn->conn, fconn->conn->xprt, fconn->conn->xprt_ctx);
+
+				if (!srv_add_to_idle_list(objt_server(fconn->conn->target), fconn->conn, 1)) {
+					/* The server doesn't want it, let's kill the connection right away */
+					fconn->conn->mux->destroy(fconn);
+					TRACE_DEVEL("outgoing connection killed", FCGI_EV_STRM_END|FCGI_EV_FCONN_ERR);
+					return;
+				}
+				/* At this point, the connection has been added to the
+				 * server idle list, so another thread may already have
+				 * hijacked it, so we can't do anything with it.
+				 */
+				TRACE_DEVEL("reusable idle connection", FCGI_EV_STRM_END, fconn->conn);
+				return;
+			}
+			else if (!fconn->conn->hash_node->node.node.leaf_p &&
+				 fcgi_avail_streams(fconn->conn) > 0 && objt_server(fconn->conn->target) &&
+				 !LIST_INLIST(&fconn->conn->session_list)) {
+				eb64_insert(&__objt_server(fconn->conn->target)->per_thr[tid].avail_conns,
+				            &fconn->conn->hash_node->node);
+			}
+		}
+	}
+
+	/* We don't want to close right now unless we're removing the last
+	 * stream and the connection is in error.
+	 */
+	if (fcgi_conn_is_dead(fconn)) {
+		/* no more stream will come, kill it now */
+		TRACE_DEVEL("leaving, killing dead connection", FCGI_EV_STRM_END, fconn->conn);
+		fcgi_release(fconn);
+	}
+	else if (fconn->task) {
+		fconn->task->expire = tick_add(now_ms, (fconn->state == FCGI_CS_CLOSED ? fconn->shut_timeout : fconn->timeout));
+		task_queue(fconn->task);
+		TRACE_DEVEL("leaving, refreshing connection's timeout", FCGI_EV_STRM_END, fconn->conn);
+	}
+	else
+		TRACE_DEVEL("leaving", FCGI_EV_STRM_END, fconn->conn);
+}
+
+
+/* Performs a synchronous or asynchronous shutr(). */
+static void fcgi_do_shutr(struct fcgi_strm *fstrm)
+{
+	struct fcgi_conn *fconn = fstrm->fconn;
+
+	TRACE_ENTER(FCGI_EV_STRM_SHUT, fconn->conn, fstrm);
+
+	if (fstrm->state == FCGI_SS_CLOSED)
+		goto done;
+
+	/* a connstream may require us to immediately kill the whole connection
+	 * for example because of a "tcp-request content reject" rule that is
+	 * normally used to limit abuse.
+	 */
+	if (se_fl_test(fstrm->sd, SE_FL_KILL_CONN) &&
+	    !(fconn->flags & (FCGI_CF_ABRTS_SENT|FCGI_CF_ABRTS_FAILED))) {
+		TRACE_STATE("stream wants to kill the connection", FCGI_EV_STRM_SHUT, fconn->conn, fstrm);
+		fconn->state = FCGI_CS_CLOSED;
+	}
+	else if (fstrm->flags & FCGI_SF_BEGIN_SENT) {
+		TRACE_STATE("no headers sent yet, trying a retryable abort", FCGI_EV_STRM_SHUT, fconn->conn, fstrm);
+		if (!(fstrm->flags & (FCGI_SF_ES_SENT|FCGI_SF_ABRT_SENT)) &&
+		    !fcgi_strm_send_abort(fconn, fstrm))
+			goto add_to_list;
+	}
+
+	fcgi_strm_close(fstrm);
+
+	if (!(fconn->wait_event.events & SUB_RETRY_SEND))
+		tasklet_wakeup(fconn->wait_event.tasklet);
+  done:
+	fstrm->flags &= ~FCGI_SF_WANT_SHUTR;
+	TRACE_LEAVE(FCGI_EV_STRM_SHUT, fconn->conn, fstrm);
+	return;
+
+  add_to_list:
+	/* Let the handler know we want to shutr, and add ourselves to the
+	 * send list if not yet done. fcgi_deferred_shut() will be
+	 * automatically called via the shut_tl tasklet when there's room
+	 * again.
+	 */
+	if (!LIST_INLIST(&fstrm->send_list)) {
+		if (fstrm->flags & (FCGI_SF_BLK_MBUSY|FCGI_SF_BLK_MROOM)) {
+			LIST_APPEND(&fconn->send_list, &fstrm->send_list);
+		}
+	}
+	fstrm->flags |= FCGI_SF_WANT_SHUTR;
+	TRACE_LEAVE(FCGI_EV_STRM_SHUT, fconn->conn, fstrm);
+	return;
+}
+
+/* Performs a synchronous or asynchronous shutw(). */
+static void fcgi_do_shutw(struct fcgi_strm *fstrm)
+{
+	struct fcgi_conn *fconn = fstrm->fconn;
+
+	TRACE_ENTER(FCGI_EV_STRM_SHUT, fconn->conn, fstrm);
+
+	if (fstrm->state != FCGI_SS_HLOC || fstrm->state == FCGI_SS_CLOSED)
+		goto done;
+
+	if (fstrm->state != FCGI_SS_ERROR && (fstrm->flags & FCGI_SF_BEGIN_SENT)) {
+		if (!(fstrm->flags & (FCGI_SF_ES_SENT|FCGI_SF_ABRT_SENT)) &&
+		    !fcgi_strm_send_abort(fconn, fstrm))
+			goto add_to_list;
+
+		if (fstrm->state == FCGI_SS_HREM)
+			fcgi_strm_close(fstrm);
+		else
+			fstrm->state = FCGI_SS_HLOC;
+	} else {
+		/* a connstream may require us to immediately kill the whole connection
+		 * for example because of a "tcp-request content reject" rule that is
+		 * normally used to limit abuse.
+		 */
+		if (se_fl_test(fstrm->sd, SE_FL_KILL_CONN) &&
+		    !(fconn->flags & (FCGI_CF_ABRTS_SENT|FCGI_CF_ABRTS_FAILED))) {
+			TRACE_STATE("stream wants to kill the connection", FCGI_EV_STRM_SHUT, fconn->conn, fstrm);
+			fconn->state = FCGI_CS_CLOSED;
+		}
+
+		fcgi_strm_close(fstrm);
+	}
+
+	if (!(fconn->wait_event.events & SUB_RETRY_SEND))
+		tasklet_wakeup(fconn->wait_event.tasklet);
+  done:
+	fstrm->flags &= ~FCGI_SF_WANT_SHUTW;
+	TRACE_LEAVE(FCGI_EV_STRM_SHUT, fconn->conn, fstrm);
+	return;
+
+  add_to_list:
+	/* Let the handler know we want to shutr, and add ourselves to the
+	 * send list if not yet done. fcgi_deferred_shut() will be
+	 * automatically called via the shut_tl tasklet when there's room
+	 * again.
+	 */
+	if (!LIST_INLIST(&fstrm->send_list)) {
+		if (fstrm->flags & (FCGI_SF_BLK_MBUSY|FCGI_SF_BLK_MROOM)) {
+			LIST_APPEND(&fconn->send_list, &fstrm->send_list);
+		}
+	}
+	fstrm->flags |= FCGI_SF_WANT_SHUTW;
+	TRACE_LEAVE(FCGI_EV_STRM_SHUT, fconn->conn, fstrm);
+	return;
+}
+
+/* This is the tasklet referenced in fstrm->shut_tl, it is used for
+ * deferred shutdowns when the fcgi_detach() was done but the mux buffer was full
+ * and prevented the last record from being emitted.
+ */
+struct task *fcgi_deferred_shut(struct task *t, void *ctx, unsigned int state)
+{
+	struct fcgi_strm *fstrm = ctx;
+	struct fcgi_conn *fconn = fstrm->fconn;
+
+	TRACE_ENTER(FCGI_EV_STRM_SHUT, fconn->conn, fstrm);
+
+	if (fstrm->flags & FCGI_SF_NOTIFIED) {
+		/* some data processing remains to be done first */
+		goto end;
+	}
+
+	if (fstrm->flags & FCGI_SF_WANT_SHUTW)
+		fcgi_do_shutw(fstrm);
+
+	if (fstrm->flags & FCGI_SF_WANT_SHUTR)
+		fcgi_do_shutr(fstrm);
+
+	if (!(fstrm->flags & (FCGI_SF_WANT_SHUTR|FCGI_SF_WANT_SHUTW))) {
+		/* We're done trying to send, remove ourself from the send_list */
+		LIST_DEL_INIT(&fstrm->send_list);
+
+		if (!fcgi_strm_sc(fstrm)) {
+			fcgi_strm_destroy(fstrm);
+			if (fcgi_conn_is_dead(fconn))
+				fcgi_release(fconn);
+		}
+	}
+ end:
+	TRACE_LEAVE(FCGI_EV_STRM_SHUT);
+	return NULL;
+}
+
+/* shutr() called by the stream connector (mux_ops.shutr) */
+static void fcgi_shutr(struct stconn *sc, enum co_shr_mode mode)
+{
+	struct fcgi_strm *fstrm = __sc_mux_strm(sc);
+
+	TRACE_POINT(FCGI_EV_STRM_SHUT, fstrm->fconn->conn, fstrm);
+	if (!mode)
+		return;
+	fcgi_do_shutr(fstrm);
+}
+
+/* shutw() called by the stream connector (mux_ops.shutw) */
+static void fcgi_shutw(struct stconn *sc, enum co_shw_mode mode)
+{
+	struct fcgi_strm *fstrm = __sc_mux_strm(sc);
+
+	TRACE_POINT(FCGI_EV_STRM_SHUT, fstrm->fconn->conn, fstrm);
+	fcgi_do_shutw(fstrm);
+}
+
+/* Called from the upper layer, to subscribe <es> to events <event_type>. The
+ * event subscriber <es> is not allowed to change from a previous call as long
+ * as at least one event is still subscribed. The <event_type> must only be a
+ * combination of SUB_RETRY_RECV and SUB_RETRY_SEND. It always returns 0.
+ */
+static int fcgi_subscribe(struct stconn *sc, int event_type, struct wait_event *es)
+{
+	struct fcgi_strm *fstrm = __sc_mux_strm(sc);
+	struct fcgi_conn *fconn = fstrm->fconn;
+
+	BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV));
+	BUG_ON(fstrm->subs && fstrm->subs != es);
+
+	es->events |= event_type;
+	fstrm->subs = es;
+
+	if (event_type & SUB_RETRY_RECV)
+		TRACE_DEVEL("unsubscribe(recv)", FCGI_EV_STRM_RECV, fconn->conn, fstrm);
+
+	if (event_type & SUB_RETRY_SEND) {
+		TRACE_DEVEL("unsubscribe(send)", FCGI_EV_STRM_SEND, fconn->conn, fstrm);
+		if (!LIST_INLIST(&fstrm->send_list))
+			LIST_APPEND(&fconn->send_list, &fstrm->send_list);
+	}
+	return 0;
+}
+
+/* Called from the upper layer, to unsubscribe <es> from events <event_type>
+ * (undo fcgi_subscribe). The <es> pointer is not allowed to differ from the one
+ * passed to the subscribe() call. It always returns zero.
+ */
+static int fcgi_unsubscribe(struct stconn *sc, int event_type, struct wait_event *es)
+{
+	struct fcgi_strm *fstrm = __sc_mux_strm(sc);
+	struct fcgi_conn *fconn = fstrm->fconn;
+
+	BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV));
+	BUG_ON(fstrm->subs && fstrm->subs != es);
+
+	es->events &= ~event_type;
+	if (!es->events)
+		fstrm->subs = NULL;
+
+	if (event_type & SUB_RETRY_RECV)
+		TRACE_DEVEL("subscribe(recv)", FCGI_EV_STRM_RECV, fconn->conn, fstrm);
+
+	if (event_type & SUB_RETRY_SEND) {
+		TRACE_DEVEL("subscribe(send)", FCGI_EV_STRM_SEND, fconn->conn, fstrm);
+		fstrm->flags &= ~FCGI_SF_NOTIFIED;
+		if (!(fstrm->flags & (FCGI_SF_WANT_SHUTR|FCGI_SF_WANT_SHUTW)))
+			LIST_DEL_INIT(&fstrm->send_list);
+	}
+	return 0;
+}
+
+/* Called from the upper layer, to receive data
+ *
+ * The caller is responsible for defragmenting <buf> if necessary. But <flags>
+ * must be tested to know the calling context. If CO_RFL_BUF_FLUSH is set, it
+ * means the caller wants to flush input data (from the mux buffer and the
+ * channel buffer) to be able to use kernel splicing or any kind of mux-to-mux
+ * xfer. If CO_RFL_KEEP_RECV is set, the mux must always subscribe for read
+ * events before giving back. CO_RFL_BUF_WET is set if <buf> is congested with
+ * data scheduled for leaving soon. CO_RFL_BUF_NOT_STUCK is set to instruct the
+ * mux it may optimize the data copy to <buf> if necessary. Otherwise, it should
+ * copy as much data as possible.
+ */
+static size_t fcgi_rcv_buf(struct stconn *sc, struct buffer *buf, size_t count, int flags)
+{
+	struct fcgi_strm *fstrm = __sc_mux_strm(sc);
+	struct fcgi_conn *fconn = fstrm->fconn;
+	size_t ret = 0;
+
+	TRACE_ENTER(FCGI_EV_STRM_RECV, fconn->conn, fstrm);
+
+	if (!(fconn->flags & FCGI_CF_DEM_SALLOC))
+		ret = fcgi_strm_parse_response(fstrm, buf, count);
+	else
+		TRACE_STATE("fstrm rxbuf not allocated", FCGI_EV_STRM_RECV|FCGI_EV_FSTRM_BLK, fconn->conn, fstrm);
+
+	if (b_data(&fstrm->rxbuf))
+		se_fl_set(fstrm->sd, SE_FL_RCV_MORE | SE_FL_WANT_ROOM);
+	else {
+		se_fl_clr(fstrm->sd, SE_FL_RCV_MORE | SE_FL_WANT_ROOM);
+		if (fstrm->state == FCGI_SS_ERROR || (fstrm->h1m.state == H1_MSG_DONE)) {
+			se_fl_set(fstrm->sd, SE_FL_EOI);
+			if (!(fstrm->h1m.flags & (H1_MF_VER_11|H1_MF_XFER_LEN)))
+				se_fl_set(fstrm->sd, SE_FL_EOS);
+		}
+		if (fcgi_conn_read0_pending(fconn))
+			se_fl_set(fstrm->sd, SE_FL_EOS);
+		if (se_fl_test(fstrm->sd, SE_FL_ERR_PENDING))
+			se_fl_set(fstrm->sd, SE_FL_ERROR);
+		fcgi_release_buf(fconn, &fstrm->rxbuf);
+	}
+
+	if (ret && fconn->dsi == fstrm->id) {
+		/* demux is blocking on this stream's buffer */
+		fconn->flags &= ~FCGI_CF_DEM_SFULL;
+		fcgi_conn_restart_reading(fconn, 1);
+	}
+
+	TRACE_LEAVE(FCGI_EV_STRM_RECV, fconn->conn, fstrm);
+	return ret;
+}
+
+
+/* Called from the upper layer, to send data from buffer <buf> for no more than
+ * <count> bytes. Returns the number of bytes effectively sent. Some status
+ * flags may be updated on the stream connector.
+ */
+static size_t fcgi_snd_buf(struct stconn *sc, struct buffer *buf, size_t count, int flags)
+{
+	struct fcgi_strm *fstrm = __sc_mux_strm(sc);
+	struct fcgi_conn *fconn = fstrm->fconn;
+	size_t total = 0;
+	size_t ret;
+	struct htx *htx = NULL;
+	struct htx_sl *sl;
+	struct htx_blk *blk;
+	uint32_t bsize;
+
+	TRACE_ENTER(FCGI_EV_STRM_SEND, fconn->conn, fstrm, 0, (size_t[]){count});
+
+	/* If we were not just woken because we wanted to send but couldn't,
+	 * and there's somebody else that is waiting to send, do nothing,
+	 * we will subscribe later and be put at the end of the list
+	 */
+	if (!(fstrm->flags & FCGI_SF_NOTIFIED) && !LIST_ISEMPTY(&fconn->send_list)) {
+		TRACE_STATE("other streams already waiting, going to the queue and leaving", FCGI_EV_STRM_SEND|FCGI_EV_FSTRM_BLK, fconn->conn, fstrm);
+		return 0;
+	}
+	fstrm->flags &= ~FCGI_SF_NOTIFIED;
+
+	if (fconn->state < FCGI_CS_RECORD_H) {
+		TRACE_STATE("connection not ready, leaving", FCGI_EV_STRM_SEND|FCGI_EV_FSTRM_BLK, fconn->conn, fstrm);
+		return 0;
+	}
+
+	htx = htxbuf(buf);
+	if (fstrm->id == 0) {
+		int32_t id = fcgi_conn_get_next_sid(fconn);
+
+		if (id < 0) {
+			fcgi_strm_close(fstrm);
+			se_fl_set(fstrm->sd, SE_FL_ERROR);
+			TRACE_DEVEL("couldn't get a stream ID, leaving in error", FCGI_EV_STRM_SEND|FCGI_EV_FSTRM_ERR|FCGI_EV_STRM_ERR, fconn->conn, fstrm);
+			return 0;
+		}
+
+		eb32_delete(&fstrm->by_id);
+		fstrm->by_id.key = fstrm->id = id;
+		fconn->max_id = id;
+		fconn->nb_reserved--;
+		eb32_insert(&fconn->streams_by_id, &fstrm->by_id);
+
+
+		/* Check if length of the body is known or if the message is
+		 * full. Otherwise, the request is invalid.
+		 */
+		sl = http_get_stline(htx);
+		if (!sl || (!(sl->flags & HTX_SL_F_CLEN) && !(htx->flags & HTX_FL_EOM))) {
+			htx->flags |= HTX_FL_PARSING_ERROR;
+			fcgi_strm_error(fstrm);
+			goto done;
+		}
+	}
+
+	if (!(fstrm->flags & FCGI_SF_BEGIN_SENT)) {
+		TRACE_PROTO("sending FCGI BEGIN_REQUEST record", FCGI_EV_TX_RECORD|FCGI_EV_TX_BEGREQ, fconn->conn, fstrm);
+		if (!fcgi_strm_send_begin_request(fconn, fstrm))
+			goto done;
+	}
+
+	if (!(fstrm->flags & FCGI_SF_OUTGOING_DATA) && count)
+		fstrm->flags |= FCGI_SF_OUTGOING_DATA;
+
+	while (fstrm->state < FCGI_SS_HLOC && !(fstrm->flags & FCGI_SF_BLK_ANY) &&
+	       count && !htx_is_empty(htx)) {
+		blk = htx_get_head_blk(htx);
+		ALREADY_CHECKED(blk);
+		bsize = htx_get_blksz(blk);
+
+		switch (htx_get_blk_type(blk)) {
+			case HTX_BLK_REQ_SL:
+			case HTX_BLK_HDR:
+				TRACE_USER("sending FCGI PARAMS record", FCGI_EV_TX_RECORD|FCGI_EV_TX_PARAMS, fconn->conn, fstrm, htx);
+				ret = fcgi_strm_send_params(fconn, fstrm, htx);
+				if (!ret) {
+					goto done;
+				}
+				total += ret;
+				count -= ret;
+				break;
+
+			case HTX_BLK_EOH:
+				if (!(fstrm->flags & FCGI_SF_EP_SENT)) {
+					TRACE_PROTO("sending FCGI PARAMS record", FCGI_EV_TX_RECORD|FCGI_EV_TX_PARAMS, fconn->conn, fstrm, htx);
+					ret = fcgi_strm_send_empty_params(fconn, fstrm);
+					if (!ret)
+						goto done;
+				}
+				if (htx_is_unique_blk(htx, blk) && (htx->flags & HTX_FL_EOM)) {
+					TRACE_PROTO("sending FCGI STDIN record", FCGI_EV_TX_RECORD|FCGI_EV_TX_STDIN, fconn->conn, fstrm, htx);
+					ret = fcgi_strm_send_empty_stdin(fconn, fstrm);
+					if (!ret)
+						goto done;
+				}
+				goto remove_blk;
+
+			case HTX_BLK_DATA:
+				TRACE_PROTO("sending FCGI STDIN record", FCGI_EV_TX_RECORD|FCGI_EV_TX_STDIN, fconn->conn, fstrm, htx);
+				ret = fcgi_strm_send_stdin(fconn, fstrm, htx, count, buf);
+				if (ret > 0) {
+					htx = htx_from_buf(buf);
+					total += ret;
+					count -= ret;
+					if (ret < bsize)
+						goto done;
+				}
+				break;
+
+			default:
+			  remove_blk:
+				htx_remove_blk(htx, blk);
+				total += bsize;
+				count -= bsize;
+				break;
+		}
+	}
+
+  done:
+	if (fstrm->state >= FCGI_SS_HLOC) {
+		/* trim any possibly pending data after we close (extra CR-LF,
+		 * unprocessed trailers, abnormal extra data, ...)
+		 */
+		total += count;
+		count = 0;
+	}
+
+	if (fstrm->state == FCGI_SS_ERROR) {
+		TRACE_DEVEL("reporting error to the app-layer stream", FCGI_EV_STRM_SEND|FCGI_EV_FSTRM_ERR|FCGI_EV_STRM_ERR, fconn->conn, fstrm);
+		se_fl_set_error(fstrm->sd);
+		if (!(fstrm->flags & FCGI_SF_BEGIN_SENT) || fcgi_strm_send_abort(fconn, fstrm))
+			fcgi_strm_close(fstrm);
+	}
+
+	if (htx)
+		htx_to_buf(htx, buf);
+
+	if (total > 0) {
+		if (!(fconn->wait_event.events & SUB_RETRY_SEND)) {
+			TRACE_DEVEL("data queued, waking up fconn sender", FCGI_EV_STRM_SEND|FCGI_EV_FCONN_SEND|FCGI_EV_FCONN_WAKE, fconn->conn, fstrm);
+			tasklet_wakeup(fconn->wait_event.tasklet);
+		}
+
+		/* Ok we managed to send something, leave the send_list */
+		if (!(fstrm->flags & (FCGI_SF_WANT_SHUTR|FCGI_SF_WANT_SHUTW)))
+			LIST_DEL_INIT(&fstrm->send_list);
+	}
+
+	TRACE_LEAVE(FCGI_EV_STRM_SEND, fconn->conn, fstrm, htx, (size_t[]){total});
+	return total;
+}
+
+/* for debugging with CLI's "show fd" command */
+static int fcgi_show_fd(struct buffer *msg, struct connection *conn)
+{
+	struct fcgi_conn *fconn = conn->ctx;
+	struct fcgi_strm *fstrm = NULL;
+	struct eb32_node *node;
+	int send_cnt = 0;
+	int tree_cnt = 0;
+	int orph_cnt = 0;
+	struct buffer *hmbuf, *tmbuf;
+
+	if (!fconn)
+		return 0;
+
+	list_for_each_entry(fstrm, &fconn->send_list, send_list)
+		send_cnt++;
+
+	fstrm = NULL;
+	node = eb32_first(&fconn->streams_by_id);
+	while (node) {
+		fstrm = container_of(node, struct fcgi_strm, by_id);
+		tree_cnt++;
+		if (!fcgi_strm_sc(fstrm))
+			orph_cnt++;
+		node = eb32_next(node);
+	}
+
+	hmbuf = br_head(fconn->mbuf);
+	tmbuf = br_tail(fconn->mbuf);
+	chunk_appendf(msg, " fconn.st0=%d .maxid=%d .flg=0x%04x .nbst=%u"
+		      " .nbcs=%u .send_cnt=%d .tree_cnt=%d .orph_cnt=%d .sub=%d "
+		      ".dsi=%d .dbuf=%u@%p+%u/%u .mbuf=[%u..%u|%u],h=[%u@%p+%u/%u],t=[%u@%p+%u/%u]",
+		      fconn->state, fconn->max_id, fconn->flags,
+		      fconn->nb_streams, fconn->nb_sc, send_cnt, tree_cnt, orph_cnt,
+		      fconn->wait_event.events, fconn->dsi,
+		      (unsigned int)b_data(&fconn->dbuf), b_orig(&fconn->dbuf),
+		      (unsigned int)b_head_ofs(&fconn->dbuf), (unsigned int)b_size(&fconn->dbuf),
+		      br_head_idx(fconn->mbuf), br_tail_idx(fconn->mbuf), br_size(fconn->mbuf),
+		      (unsigned int)b_data(hmbuf), b_orig(hmbuf),
+		      (unsigned int)b_head_ofs(hmbuf), (unsigned int)b_size(hmbuf),
+		      (unsigned int)b_data(tmbuf), b_orig(tmbuf),
+		      (unsigned int)b_head_ofs(tmbuf), (unsigned int)b_size(tmbuf));
+
+	if (fstrm) {
+		chunk_appendf(msg, " last_fstrm=%p .id=%d .flg=0x%04x .rxbuf=%u@%p+%u/%u .sc=%p",
+			      fstrm, fstrm->id, fstrm->flags,
+			      (unsigned int)b_data(&fstrm->rxbuf), b_orig(&fstrm->rxbuf),
+			      (unsigned int)b_head_ofs(&fstrm->rxbuf), (unsigned int)b_size(&fstrm->rxbuf),
+			      fcgi_strm_sc(fstrm));
+
+		chunk_appendf(msg, " .sd.flg=0x%08x", se_fl_get(fstrm->sd));
+		if (!se_fl_test(fstrm->sd, SE_FL_ORPHAN))
+			chunk_appendf(msg, " .sc.flg=0x%08x .sc.app=%p",
+				      fcgi_strm_sc(fstrm)->flags, fcgi_strm_sc(fstrm)->app);
+
+		chunk_appendf(msg, " .subs=%p", fstrm->subs);
+		if (fstrm->subs) {
+			chunk_appendf(msg, "(ev=%d tl=%p", fstrm->subs->events, fstrm->subs->tasklet);
+			chunk_appendf(msg, " tl.calls=%d tl.ctx=%p tl.fct=",
+				      fstrm->subs->tasklet->calls,
+				      fstrm->subs->tasklet->context);
+			resolve_sym_name(msg, NULL, fstrm->subs->tasklet->process);
+			chunk_appendf(msg, ")");
+		}
+	}
+	return 0;
+}
+
+/* Migrate the the connection to the current thread.
+ * Return 0 if successful, non-zero otherwise.
+ * Expected to be called with the old thread lock held.
+ */
+static int fcgi_takeover(struct connection *conn, int orig_tid)
+{
+	struct fcgi_conn *fcgi = conn->ctx;
+	struct task *task;
+
+	if (fd_takeover(conn->handle.fd, conn) != 0)
+		return -1;
+
+	if (conn->xprt->takeover && conn->xprt->takeover(conn, conn->xprt_ctx, orig_tid) != 0) {
+		/* We failed to takeover the xprt, even if the connection may
+		 * still be valid, flag it as error'd, as we have already
+		 * taken over the fd, and wake the tasklet, so that it will
+		 * destroy it.
+		 */
+		conn->flags |= CO_FL_ERROR;
+		tasklet_wakeup_on(fcgi->wait_event.tasklet, orig_tid);
+		return -1;
+	}
+
+	if (fcgi->wait_event.events)
+		fcgi->conn->xprt->unsubscribe(fcgi->conn, fcgi->conn->xprt_ctx,
+		    fcgi->wait_event.events, &fcgi->wait_event);
+	/* To let the tasklet know it should free itself, and do nothing else,
+	 * set its context to NULL;
+	 */
+	fcgi->wait_event.tasklet->context = NULL;
+	tasklet_wakeup_on(fcgi->wait_event.tasklet, orig_tid);
+
+	task = fcgi->task;
+	if (task) {
+		task->context = NULL;
+		fcgi->task = NULL;
+		__ha_barrier_store();
+		task_kill(task);
+
+		fcgi->task = task_new_here();
+		if (!fcgi->task) {
+			fcgi_release(fcgi);
+			return -1;
+		}
+		fcgi->task->process = fcgi_timeout_task;
+		fcgi->task->context = fcgi;
+	}
+	fcgi->wait_event.tasklet = tasklet_new();
+	if (!fcgi->wait_event.tasklet) {
+		fcgi_release(fcgi);
+		return -1;
+	}
+	fcgi->wait_event.tasklet->process = fcgi_io_cb;
+	fcgi->wait_event.tasklet->context = fcgi;
+	fcgi->conn->xprt->subscribe(fcgi->conn, fcgi->conn->xprt_ctx,
+		                    SUB_RETRY_RECV, &fcgi->wait_event);
+
+	return 0;
+}
+
+/****************************************/
+/* MUX initialization and instantiation */
+/****************************************/
+
+/* The mux operations */
+static const struct mux_ops mux_fcgi_ops = {
+	.init          = fcgi_init,
+	.wake          = fcgi_wake,
+	.attach        = fcgi_attach,
+	.get_first_sc  = fcgi_get_first_sc,
+	.detach        = fcgi_detach,
+	.destroy       = fcgi_destroy,
+	.avail_streams = fcgi_avail_streams,
+	.used_streams  = fcgi_used_streams,
+	.rcv_buf       = fcgi_rcv_buf,
+	.snd_buf       = fcgi_snd_buf,
+	.subscribe     = fcgi_subscribe,
+	.unsubscribe   = fcgi_unsubscribe,
+	.shutr         = fcgi_shutr,
+	.shutw         = fcgi_shutw,
+	.ctl           = fcgi_ctl,
+	.show_fd       = fcgi_show_fd,
+	.takeover      = fcgi_takeover,
+	.flags         = MX_FL_HTX|MX_FL_HOL_RISK|MX_FL_NO_UPG,
+	.name          = "FCGI",
+};
+
+
+/* this mux registers FCGI proto */
+static struct mux_proto_list mux_proto_fcgi =
+{ .token = IST("fcgi"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_BE, .mux = &mux_fcgi_ops };
+
+INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_fcgi);
+
+/*
+ * Local variables:
+ *  c-indent-level: 8
+ *  c-basic-offset: 8
+ * End:
+ */