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+Connection header
+=================
+
+## Proxy-Connection
+
+<!-- meta={"type": "response"} -->
+```http
+HTTP/1.1 200 OK
+Content-Type: text/html; charset=UTF-8
+Content-Length: 11
+Proxy-Connection: close
+Date: Thu, 31 Dec 2009 20:55:48 +0000
+
+hello world
+```
+
+```log
+off=0 message begin
+off=5 len=3 span[version]="1.1"
+off=8 version complete
+off=13 len=2 span[status]="OK"
+off=17 status complete
+off=17 len=12 span[header_field]="Content-Type"
+off=30 header_field complete
+off=31 len=24 span[header_value]="text/html; charset=UTF-8"
+off=57 header_value complete
+off=57 len=14 span[header_field]="Content-Length"
+off=72 header_field complete
+off=73 len=2 span[header_value]="11"
+off=77 header_value complete
+off=77 len=16 span[header_field]="Proxy-Connection"
+off=94 header_field complete
+off=95 len=5 span[header_value]="close"
+off=102 header_value complete
+off=102 len=4 span[header_field]="Date"
+off=107 header_field complete
+off=108 len=31 span[header_value]="Thu, 31 Dec 2009 20:55:48 +0000"
+off=141 header_value complete
+off=143 headers complete status=200 v=1/1 flags=22 content_length=11
+off=143 len=11 span[body]="hello world"
+off=154 message complete
+```
+
+## HTTP/1.0 with keep-alive and EOF-terminated 200 status
+
+There is no `Content-Length` in this response, so even though the
+`keep-alive` is on - it should read until EOF.
+
+<!-- meta={"type": "response"} -->
+```http
+HTTP/1.0 200 OK
+Connection: keep-alive
+
+HTTP/1.0 200 OK
+```
+
+```log
+off=0 message begin
+off=5 len=3 span[version]="1.0"
+off=8 version complete
+off=13 len=2 span[status]="OK"
+off=17 status complete
+off=17 len=10 span[header_field]="Connection"
+off=28 header_field complete
+off=29 len=10 span[header_value]="keep-alive"
+off=41 header_value complete
+off=43 headers complete status=200 v=1/0 flags=1 content_length=0
+off=43 len=15 span[body]="HTTP/1.0 200 OK"
+```
+
+## HTTP/1.0 with keep-alive and 204 status
+
+Responses with `204` status cannot have a body.
+
+<!-- meta={"type": "response"} -->
+```http
+HTTP/1.0 204 No content
+Connection: keep-alive
+
+HTTP/1.0 200 OK
+```
+
+```log
+off=0 message begin
+off=5 len=3 span[version]="1.0"
+off=8 version complete
+off=13 len=10 span[status]="No content"
+off=25 status complete
+off=25 len=10 span[header_field]="Connection"
+off=36 header_field complete
+off=37 len=10 span[header_value]="keep-alive"
+off=49 header_value complete
+off=51 headers complete status=204 v=1/0 flags=1 content_length=0
+off=51 message complete
+off=51 reset
+off=51 message begin
+off=56 len=3 span[version]="1.0"
+off=59 version complete
+off=64 len=2 span[status]="OK"
+```
+
+## HTTP/1.1 with EOF-terminated 200 status
+
+There is no `Content-Length` in this response, so even though the
+`keep-alive` is on (implicitly in HTTP 1.1) - it should read until EOF.
+
+<!-- meta={"type": "response"} -->
+```http
+HTTP/1.1 200 OK
+
+HTTP/1.1 200 OK
+```
+
+```log
+off=0 message begin
+off=5 len=3 span[version]="1.1"
+off=8 version complete
+off=13 len=2 span[status]="OK"
+off=17 status complete
+off=19 headers complete status=200 v=1/1 flags=0 content_length=0
+off=19 len=15 span[body]="HTTP/1.1 200 OK"
+```
+
+## HTTP/1.1 with 204 status
+
+Responses with `204` status cannot have a body.
+
+<!-- meta={"type": "response"} -->
+```http
+HTTP/1.1 204 No content
+
+HTTP/1.1 200 OK
+```
+
+```log
+off=0 message begin
+off=5 len=3 span[version]="1.1"
+off=8 version complete
+off=13 len=10 span[status]="No content"
+off=25 status complete
+off=27 headers complete status=204 v=1/1 flags=0 content_length=0
+off=27 message complete
+off=27 reset
+off=27 message begin
+off=32 len=3 span[version]="1.1"
+off=35 version complete
+off=40 len=2 span[status]="OK"
+```
+
+## HTTP/1.1 with keep-alive disabled and 204 status
+
+<!-- meta={"type": "response" } -->
+```http
+HTTP/1.1 204 No content
+Connection: close
+
+HTTP/1.1 200 OK
+```
+
+```log
+off=0 message begin
+off=5 len=3 span[version]="1.1"
+off=8 version complete
+off=13 len=10 span[status]="No content"
+off=25 status complete
+off=25 len=10 span[header_field]="Connection"
+off=36 header_field complete
+off=37 len=5 span[header_value]="close"
+off=44 header_value complete
+off=46 headers complete status=204 v=1/1 flags=2 content_length=0
+off=46 message complete
+off=47 error code=5 reason="Data after `Connection: close`"
+```
+
+## HTTP/1.1 with keep-alive disabled, content-length (lenient)
+
+Parser should discard extra request in lenient mode.
+
+<!-- meta={"type": "response-lenient-data-after-close" } -->
+```http
+HTTP/1.1 200 No content
+Content-Length: 5
+Connection: close
+
+2ad731e3-4dcd-4f70-b871-0ad284b29ffc
+```
+
+```log
+off=0 message begin
+off=5 len=3 span[version]="1.1"
+off=8 version complete
+off=13 len=10 span[status]="No content"
+off=25 status complete
+off=25 len=14 span[header_field]="Content-Length"
+off=40 header_field complete
+off=41 len=1 span[header_value]="5"
+off=44 header_value complete
+off=44 len=10 span[header_field]="Connection"
+off=55 header_field complete
+off=56 len=5 span[header_value]="close"
+off=63 header_value complete
+off=65 headers complete status=200 v=1/1 flags=22 content_length=5
+off=65 len=5 span[body]="2ad73"
+off=70 message complete
+```
+
+## HTTP/1.1 with keep-alive disabled, content-length
+
+Parser should discard extra request in strict mode.
+
+<!-- meta={"type": "response" } -->
+```http
+HTTP/1.1 200 No content
+Content-Length: 5
+Connection: close
+
+2ad731e3-4dcd-4f70-b871-0ad284b29ffc
+```
+
+```log
+off=0 message begin
+off=5 len=3 span[version]="1.1"
+off=8 version complete
+off=13 len=10 span[status]="No content"
+off=25 status complete
+off=25 len=14 span[header_field]="Content-Length"
+off=40 header_field complete
+off=41 len=1 span[header_value]="5"
+off=44 header_value complete
+off=44 len=10 span[header_field]="Connection"
+off=55 header_field complete
+off=56 len=5 span[header_value]="close"
+off=63 header_value complete
+off=65 headers complete status=200 v=1/1 flags=22 content_length=5
+off=65 len=5 span[body]="2ad73"
+off=70 message complete
+off=71 error code=5 reason="Data after `Connection: close`"
+```
+
+## HTTP/1.1 with keep-alive disabled and 204 status (lenient)
+
+<!-- meta={"type": "response-lenient-keep-alive"} -->
+```http
+HTTP/1.1 204 No content
+Connection: close
+
+HTTP/1.1 200 OK
+```
+
+```log
+off=0 message begin
+off=5 len=3 span[version]="1.1"
+off=8 version complete
+off=13 len=10 span[status]="No content"
+off=25 status complete
+off=25 len=10 span[header_field]="Connection"
+off=36 header_field complete
+off=37 len=5 span[header_value]="close"
+off=44 header_value complete
+off=46 headers complete status=204 v=1/1 flags=2 content_length=0
+off=46 message complete
+off=46 reset
+off=46 message begin
+off=51 len=3 span[version]="1.1"
+off=54 version complete
+off=59 len=2 span[status]="OK"
+```
+
+## HTTP 101 response with Upgrade and Content-Length header
+
+<!-- meta={"type": "response"} -->
+```http
+HTTP/1.1 101 Switching Protocols
+Connection: upgrade
+Upgrade: h2c
+Content-Length: 4
+
+body\
+proto
+```
+
+```log
+off=0 message begin
+off=5 len=3 span[version]="1.1"
+off=8 version complete
+off=13 len=19 span[status]="Switching Protocols"
+off=34 status complete
+off=34 len=10 span[header_field]="Connection"
+off=45 header_field complete
+off=46 len=7 span[header_value]="upgrade"
+off=55 header_value complete
+off=55 len=7 span[header_field]="Upgrade"
+off=63 header_field complete
+off=64 len=3 span[header_value]="h2c"
+off=69 header_value complete
+off=69 len=14 span[header_field]="Content-Length"
+off=84 header_field complete
+off=85 len=1 span[header_value]="4"
+off=88 header_value complete
+off=90 headers complete status=101 v=1/1 flags=34 content_length=4
+off=90 message complete
+off=90 error code=22 reason="Pause on CONNECT/Upgrade"
+```
+
+## HTTP 101 response with Upgrade and Transfer-Encoding header
+
+<!-- meta={"type": "response"} -->
+```http
+HTTP/1.1 101 Switching Protocols
+Connection: upgrade
+Upgrade: h2c
+Transfer-Encoding: chunked
+
+2
+bo
+2
+dy
+0
+
+proto
+```
+
+```log
+off=0 message begin
+off=5 len=3 span[version]="1.1"
+off=8 version complete
+off=13 len=19 span[status]="Switching Protocols"
+off=34 status complete
+off=34 len=10 span[header_field]="Connection"
+off=45 header_field complete
+off=46 len=7 span[header_value]="upgrade"
+off=55 header_value complete
+off=55 len=7 span[header_field]="Upgrade"
+off=63 header_field complete
+off=64 len=3 span[header_value]="h2c"
+off=69 header_value complete
+off=69 len=17 span[header_field]="Transfer-Encoding"
+off=87 header_field complete
+off=88 len=7 span[header_value]="chunked"
+off=97 header_value complete
+off=99 headers complete status=101 v=1/1 flags=21c content_length=0
+off=99 message complete
+off=99 error code=22 reason="Pause on CONNECT/Upgrade"
+```
+
+## HTTP 200 response with Upgrade header
+
+<!-- meta={"type": "response"} -->
+```http
+HTTP/1.1 200 OK
+Connection: upgrade
+Upgrade: h2c
+
+body
+```
+
+```log
+off=0 message begin
+off=5 len=3 span[version]="1.1"
+off=8 version complete
+off=13 len=2 span[status]="OK"
+off=17 status complete
+off=17 len=10 span[header_field]="Connection"
+off=28 header_field complete
+off=29 len=7 span[header_value]="upgrade"
+off=38 header_value complete
+off=38 len=7 span[header_field]="Upgrade"
+off=46 header_field complete
+off=47 len=3 span[header_value]="h2c"
+off=52 header_value complete
+off=54 headers complete status=200 v=1/1 flags=14 content_length=0
+off=54 len=4 span[body]="body"
+```
+
+## HTTP 200 response with Upgrade header and Content-Length
+
+<!-- meta={"type": "response"} -->
+```http
+HTTP/1.1 200 OK
+Connection: upgrade
+Upgrade: h2c
+Content-Length: 4
+
+body
+```
+
+```log
+off=0 message begin
+off=5 len=3 span[version]="1.1"
+off=8 version complete
+off=13 len=2 span[status]="OK"
+off=17 status complete
+off=17 len=10 span[header_field]="Connection"
+off=28 header_field complete
+off=29 len=7 span[header_value]="upgrade"
+off=38 header_value complete
+off=38 len=7 span[header_field]="Upgrade"
+off=46 header_field complete
+off=47 len=3 span[header_value]="h2c"
+off=52 header_value complete
+off=52 len=14 span[header_field]="Content-Length"
+off=67 header_field complete
+off=68 len=1 span[header_value]="4"
+off=71 header_value complete
+off=73 headers complete status=200 v=1/1 flags=34 content_length=4
+off=73 len=4 span[body]="body"
+off=77 message complete
+```
+
+## HTTP 200 response with Upgrade header and Transfer-Encoding
+
+<!-- meta={"type": "response"} -->
+```http
+HTTP/1.1 200 OK
+Connection: upgrade
+Upgrade: h2c
+Transfer-Encoding: chunked
+
+2
+bo
+2
+dy
+0
+
+
+```
+
+```log
+off=0 message begin
+off=5 len=3 span[version]="1.1"
+off=8 version complete
+off=13 len=2 span[status]="OK"
+off=17 status complete
+off=17 len=10 span[header_field]="Connection"
+off=28 header_field complete
+off=29 len=7 span[header_value]="upgrade"
+off=38 header_value complete
+off=38 len=7 span[header_field]="Upgrade"
+off=46 header_field complete
+off=47 len=3 span[header_value]="h2c"
+off=52 header_value complete
+off=52 len=17 span[header_field]="Transfer-Encoding"
+off=70 header_field complete
+off=71 len=7 span[header_value]="chunked"
+off=80 header_value complete
+off=82 headers complete status=200 v=1/1 flags=21c content_length=0
+off=85 chunk header len=2
+off=85 len=2 span[body]="bo"
+off=89 chunk complete
+off=92 chunk header len=2
+off=92 len=2 span[body]="dy"
+off=96 chunk complete
+off=99 chunk header len=0
+off=101 chunk complete
+off=101 message complete
+```
+
+## HTTP 304 with Content-Length
+
+<!-- meta={"type": "response"} -->
+```http
+HTTP/1.1 304 Not Modified
+Content-Length: 10
+
+
+HTTP/1.1 200 OK
+Content-Length: 5
+
+hello
+```
+
+```log
+off=0 message begin
+off=5 len=3 span[version]="1.1"
+off=8 version complete
+off=13 len=12 span[status]="Not Modified"
+off=27 status complete
+off=27 len=14 span[header_field]="Content-Length"
+off=42 header_field complete
+off=43 len=2 span[header_value]="10"
+off=47 header_value complete
+off=49 headers complete status=304 v=1/1 flags=20 content_length=10
+off=49 message complete
+off=51 reset
+off=51 message begin
+off=56 len=3 span[version]="1.1"
+off=59 version complete
+off=64 len=2 span[status]="OK"
+off=68 status complete
+off=68 len=14 span[header_field]="Content-Length"
+off=83 header_field complete
+off=84 len=1 span[header_value]="5"
+off=87 header_value complete
+off=89 headers complete status=200 v=1/1 flags=20 content_length=5
+off=89 len=5 span[body]="hello"
+off=94 message complete
+```
+
+## HTTP 304 with Transfer-Encoding
+
+<!-- meta={"type": "response"} -->
+```http
+HTTP/1.1 304 Not Modified
+Transfer-Encoding: chunked
+
+HTTP/1.1 200 OK
+Transfer-Encoding: chunked
+
+5
+hello
+0
+
+```
+
+```log
+off=0 message begin
+off=5 len=3 span[version]="1.1"
+off=8 version complete
+off=13 len=12 span[status]="Not Modified"
+off=27 status complete
+off=27 len=17 span[header_field]="Transfer-Encoding"
+off=45 header_field complete
+off=46 len=7 span[header_value]="chunked"
+off=55 header_value complete
+off=57 headers complete status=304 v=1/1 flags=208 content_length=0
+off=57 message complete
+off=57 reset
+off=57 message begin
+off=62 len=3 span[version]="1.1"
+off=65 version complete
+off=70 len=2 span[status]="OK"
+off=74 status complete
+off=74 len=17 span[header_field]="Transfer-Encoding"
+off=92 header_field complete
+off=93 len=7 span[header_value]="chunked"
+off=102 header_value complete
+off=104 headers complete status=200 v=1/1 flags=208 content_length=0
+off=107 chunk header len=5
+off=107 len=5 span[body]="hello"
+off=114 chunk complete
+off=117 chunk header len=0
+```
+
+## HTTP 100 first, then 400
+
+<!-- meta={"type": "response"} -->
+```http
+HTTP/1.1 100 Continue
+
+
+HTTP/1.1 404 Not Found
+Content-Type: text/plain; charset=utf-8
+Content-Length: 14
+Date: Fri, 15 Sep 2023 19:47:23 GMT
+Server: Python/3.10 aiohttp/4.0.0a2.dev0
+
+404: Not Found
+```
+
+```log
+off=0 message begin
+off=5 len=3 span[version]="1.1"
+off=8 version complete
+off=13 len=8 span[status]="Continue"
+off=23 status complete
+off=25 headers complete status=100 v=1/1 flags=0 content_length=0
+off=25 message complete
+off=27 reset
+off=27 message begin
+off=32 len=3 span[version]="1.1"
+off=35 version complete
+off=40 len=9 span[status]="Not Found"
+off=51 status complete
+off=51 len=12 span[header_field]="Content-Type"
+off=64 header_field complete
+off=65 len=25 span[header_value]="text/plain; charset=utf-8"
+off=92 header_value complete
+off=92 len=14 span[header_field]="Content-Length"
+off=107 header_field complete
+off=108 len=2 span[header_value]="14"
+off=112 header_value complete
+off=112 len=4 span[header_field]="Date"
+off=117 header_field complete
+off=118 len=29 span[header_value]="Fri, 15 Sep 2023 19:47:23 GMT"
+off=149 header_value complete
+off=149 len=6 span[header_field]="Server"
+off=156 header_field complete
+off=157 len=32 span[header_value]="Python/3.10 aiohttp/4.0.0a2.dev0"
+off=191 header_value complete
+off=193 headers complete status=404 v=1/1 flags=20 content_length=14
+off=193 len=14 span[body]="404: Not Found"
+off=207 message complete
+```
+
+## HTTP 103 first, then 200
+
+<!-- meta={"type": "response"} -->
+```http
+HTTP/1.1 103 Early Hints
+Link: </styles.css>; rel=preload; as=style
+
+HTTP/1.1 200 OK
+Date: Wed, 13 Sep 2023 11:09:41 GMT
+Connection: keep-alive
+Keep-Alive: timeout=5
+Content-Length: 17
+
+response content
+```
+
+```log
+off=0 message begin
+off=5 len=3 span[version]="1.1"
+off=8 version complete
+off=13 len=11 span[status]="Early Hints"
+off=26 status complete
+off=26 len=4 span[header_field]="Link"
+off=31 header_field complete
+off=32 len=36 span[header_value]="</styles.css>; rel=preload; as=style"
+off=70 header_value complete
+off=72 headers complete status=103 v=1/1 flags=0 content_length=0
+off=72 message complete
+off=72 reset
+off=72 message begin
+off=77 len=3 span[version]="1.1"
+off=80 version complete
+off=85 len=2 span[status]="OK"
+off=89 status complete
+off=89 len=4 span[header_field]="Date"
+off=94 header_field complete
+off=95 len=29 span[header_value]="Wed, 13 Sep 2023 11:09:41 GMT"
+off=126 header_value complete
+off=126 len=10 span[header_field]="Connection"
+off=137 header_field complete
+off=138 len=10 span[header_value]="keep-alive"
+off=150 header_value complete
+off=150 len=10 span[header_field]="Keep-Alive"
+off=161 header_field complete
+off=162 len=9 span[header_value]="timeout=5"
+off=173 header_value complete
+off=173 len=14 span[header_field]="Content-Length"
+off=188 header_field complete
+off=189 len=2 span[header_value]="17"
+off=193 header_value complete
+off=195 headers complete status=200 v=1/1 flags=21 content_length=17
+off=195 len=16 span[body]="response content"
+```
+\ No newline at end of file