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GODEBUG=h2debug=1 is now GODEBUG=http2debug=1, per golang/go#13611 (comment https://github.com/golang/go/issues/13611#issuecomment-169534496) and there is a new debugging level h2debug=2 for logging all written frames as well, which was code I originally wrote for debugging the lego/ACME/Akamai issues in golang/go#13637 and letsencrypt/boulder#1279. This also moves the common vlogf calls inside if VerboseLogs blocks, to avoid allocations. I didn't do the rare ones. Example client output, fetching https://ip.appspot.com/: 2016/01/07 23:24:52 http2: Transport failed to get client conn for ip.appspot.com:443: http2: no cached connection was available 2016/01/07 23:24:52 http2: Transport creating client conn to 64.233.183.141:443 2016/01/07 23:24:52 http2: Framer 0xc82028c420: wrote SETTINGS len=12, settings: ENABLE_PUSH=0, INITIAL_WINDOW_SIZE=4194304 2016/01/07 23:24:52 http2: Framer 0xc82028c420: wrote WINDOW_UPDATE len=4 (conn) incr=1073741824 2016/01/07 23:24:52 http2: Framer 0xc82028c420: wrote SETTINGS flags=ACK len=0 2016/01/07 23:24:52 http2: Transport encoding header ":authority" = "ip.appspot.com" 2016/01/07 23:24:52 http2: Transport encoding header ":method" = "GET" 2016/01/07 23:24:52 http2: Transport encoding header ":path" = "/" 2016/01/07 23:24:52 http2: Transport encoding header ":scheme" = "https" 2016/01/07 23:24:52 http2: Transport encoding header "accept-encoding" = "gzip" 2016/01/07 23:24:52 http2: Transport encoding header "user-agent" = "Go-http-client/2.0" 2016/01/07 23:24:52 http2: Transport received WINDOW_UPDATE len=4 (conn) incr=983041 2016/01/07 23:24:52 http2: Framer 0xc82028c420: wrote HEADERS flags=END_STREAM|END_HEADERS stream=1 len=35 2016/01/07 23:24:52 http2: Transport received SETTINGS flags=ACK len=0 2016/01/07 23:24:52 http2: Transport received HEADERS flags=END_HEADERS stream=1 len=123 2016/01/07 23:24:52 http2: Transport decoded header field ":status" = "200" 2016/01/07 23:24:52 http2: Transport decoded header field "content-type" = "text/plain;" 2016/01/07 23:24:52 http2: Transport decoded header field "date" = "Thu, 07 Jan 2016 23:24:52 GMT" 2016/01/07 23:24:52 http2: Transport decoded header field "server" = "Google Frontend" 2016/01/07 23:24:52 http2: Transport decoded header field "content-length" = "14" 2016/01/07 23:24:52 http2: Transport decoded header field "alternate-protocol" = "443:quic,p=1" 2016/01/07 23:24:52 http2: Transport decoded header field "alt-svc" = "quic=\":443\"; ma=604800; v=\"30,29,28,27,26,25\"" 2016/01/07 23:24:52 http2: Transport received DATA flags=END_STREAM stream=1 len=14 data="146.148.92.232" 2016/01/07 23:24:52 http2: Transport received PING len=8 ping="\x00\x00\x00\x00\x00\x00\x00\x00" 2016/01/07 23:24:52 http2: Framer 0xc82028c420: wrote PING flags=ACK len=8 ping="\x00\x00\x00\x00\x00\x00\x00\x00" Example server output, with a client fetching / and getting a 404: 2016/01/07 23:25:45 http2: server connection from 72.14.229.81:58273 on 0xc820066100 2016/01/07 23:25:45 http2: server: error reading preface from client 72.14.229.81:58273: EOF 2016/01/07 23:25:45 http2: Framer 0xc820228210: wrote SETTINGS len=18, settings: MAX_FRAME_SIZE=1048576, MAX_CONCURRENT_STREAMS=250, MAX_HEADER_LIST_SIZE=1048896 2016/01/07 23:25:45 http2: server connection from 72.14.229.81:6801 on 0xc820066100 2016/01/07 23:25:45 http2: Framer 0xc8202e8370: wrote SETTINGS len=18, settings: MAX_FRAME_SIZE=1048576, MAX_CONCURRENT_STREAMS=250, MAX_HEADER_LIST_SIZE=1048896 2016/01/07 23:25:45 http2: server: client 72.14.229.81:6801 said hello 2016/01/07 23:25:45 http2: server read frame SETTINGS len=12, settings: MAX_CONCURRENT_STREAMS=1000, INITIAL_WINDOW_SIZE=6291456 2016/01/07 23:25:45 http2: server processing setting [MAX_CONCURRENT_STREAMS = 1000] 2016/01/07 23:25:45 http2: server processing setting [INITIAL_WINDOW_SIZE = 6291456] 2016/01/07 23:25:45 http2: Framer 0xc8202e8370: wrote SETTINGS flags=ACK len=0 2016/01/07 23:25:45 http2: server read frame WINDOW_UPDATE len=4 (conn) incr=15663105 2016/01/07 23:25:45 http2: server read frame HEADERS flags=END_STREAM|END_HEADERS|PRIORITY stream=1 len=238 2016/01/07 23:25:45 http2: server decoded header field ":method" = "GET" 2016/01/07 23:25:45 http2: server decoded header field ":authority" = "(redacted):4430" 2016/01/07 23:25:45 http2: server decoded header field ":scheme" = "https" 2016/01/07 23:25:45 http2: server decoded header field ":path" = "/" 2016/01/07 23:25:45 http2: server decoded header field "cache-control" = "max-age=0" 2016/01/07 23:25:45 http2: server decoded header field "accept" = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8" 2016/01/07 23:25:45 http2: server decoded header field "upgrade-insecure-requests" = "1" 2016/01/07 23:25:45 http2: server decoded header field "user-agent" = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/537." 2016/01/07 23:25:45 http2: server decoded header field "accept-encoding" = "gzip, deflate, sdch" 2016/01/07 23:25:45 http2: server decoded header field "accept-language" = "en-US,en;q=0.8" 2016/01/07 23:25:45 http2: server encoding header ":status" = "404" 2016/01/07 23:25:45 http2: server encoding header "content-type" = "text/plain; charset=utf-8" 2016/01/07 23:25:45 http2: server encoding header "x-content-type-options" = "nosniff" 2016/01/07 23:25:45 http2: server encoding header "content-length" = "19" 2016/01/07 23:25:45 http2: server encoding header "date" = "Thu, 07 Jan 2016 23:25:45 GMT" 2016/01/07 23:25:45 http2: Framer 0xc8202e8370: wrote HEADERS flags=END_HEADERS stream=1 len=73 2016/01/07 23:25:45 http2: Framer 0xc8202e8370: wrote DATA flags=END_STREAM stream=1 len=19 data="404 page not found\n" 2016/01/07 23:25:45 http2: server read frame SETTINGS flags=ACK len=0 Change-Id: Ifb3fe4e588ff54abd8bc3facbb419c3c3809bcba Reviewed-on: https://go-review.googlesource.com/18372 Reviewed-by: Blake Mizerany <blake.mizerany@gmail.com> Reviewed-by: Andrew Gerrand <adg@golang.org>
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