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diff --git a/src/shrpx_http.h b/src/shrpx_http.h
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+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2012 Tatsuhiro Tsujikawa
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef SHRPX_HTTP_H
+#define SHRPX_HTTP_H
+
+#include "shrpx.h"
+
+#include <string>
+
+#include <nghttp2/nghttp2.h>
+
+#include "shrpx_config.h"
+#include "util.h"
+#include "allocator.h"
+
+using namespace nghttp2;
+
+namespace shrpx {
+
+namespace http {
+
+StringRef create_error_html(BlockAllocator &balloc, unsigned int status_code);
+
+template <typename OutputIt>
+OutputIt create_via_header_value(OutputIt dst, int major, int minor) {
+  *dst++ = static_cast<char>(major + '0');
+  if (major < 2) {
+    *dst++ = '.';
+    *dst++ = static_cast<char>(minor + '0');
+  }
+  return util::copy_lit(dst, " nghttpx");
+}
+
+// Returns generated RFC 7239 Forwarded header field value.  The
+// |params| is bitwise-OR of zero or more of shrpx_forwarded_param
+// defined in shrpx_config.h.
+StringRef create_forwarded(BlockAllocator &balloc, int params,
+                           const StringRef &node_by, const StringRef &node_for,
+                           const StringRef &host, const StringRef &proto);
+
+// Adds ANSI color codes to HTTP headers |hdrs|.
+std::string colorizeHeaders(const char *hdrs);
+
+ssize_t select_padding_callback(nghttp2_session *session,
+                                const nghttp2_frame *frame, size_t max_payload,
+                                void *user_data);
+
+// Creates set-cookie-string for cookie based affinity.  If |path| is
+// not empty, "; <path>" is added.  If |secure| is true, "; Secure" is
+// added.
+StringRef create_affinity_cookie(BlockAllocator &balloc, const StringRef &name,
+                                 uint32_t affinity_cookie,
+                                 const StringRef &path, bool secure);
+
+// Returns true if |secure| indicates that Secure attribute should be
+// set.
+bool require_cookie_secure_attribute(SessionAffinityCookieSecure secure,
+                                     const StringRef &scheme);
+
+// Returns RFC 7838 alt-svc header field value.
+StringRef create_altsvc_header_value(BlockAllocator &balloc,
+                                     const std::vector<AltSvc> &altsvcs);
+
+// Returns true if either of the following conditions holds:
+// - scheme is https and encrypted is true
+// - scheme is http and encrypted is false
+// Otherwise returns false.
+bool check_http_scheme(const StringRef &scheme, bool encrypted);
+
+} // namespace http
+
+} // namespace shrpx
+
+#endif // SHRPX_HTTP_H