Add HTTP/2 snippets to all working examples

examples/echo_get/README.asciidoc

@@ -12,7 +12,7 @@ Then point your browser to http://localhost:8080/?echo=hello
 You can replace the `echo` parameter with another to check
 that the handler is echoing it back properly.
 
-== Example output
+== HTTP/1.1 example output
 
 [source,bash]
 ----
@@ -26,3 +26,57 @@ content-type: text/plain; charset=utf-8
 
 saymyname
 ----
+
+== HTTP/2 example output
+
+[source,bash]
+----
+$ nghttp -v "http://localhost:8080/?echo=saymyname"
+[  0.000] Connected
+[  0.000] send SETTINGS frame <length=12, flags=0x00, stream_id=0>
+          (niv=2)
+          [SETTINGS_MAX_CONCURRENT_STREAMS(0x03):100]
+          [SETTINGS_INITIAL_WINDOW_SIZE(0x04):65535]
+[  0.000] send PRIORITY frame <length=5, flags=0x00, stream_id=3>
+          (dep_stream_id=0, weight=201, exclusive=0)
+[  0.000] send PRIORITY frame <length=5, flags=0x00, stream_id=5>
+          (dep_stream_id=0, weight=101, exclusive=0)
+[  0.000] send PRIORITY frame <length=5, flags=0x00, stream_id=7>
+          (dep_stream_id=0, weight=1, exclusive=0)
+[  0.000] send PRIORITY frame <length=5, flags=0x00, stream_id=9>
+          (dep_stream_id=7, weight=1, exclusive=0)
+[  0.000] send PRIORITY frame <length=5, flags=0x00, stream_id=11>
+          (dep_stream_id=3, weight=1, exclusive=0)
+[  0.000] send HEADERS frame <length=51, flags=0x25, stream_id=13>
+          ; END_STREAM | END_HEADERS | PRIORITY
+          (padlen=0, dep_stream_id=11, weight=16, exclusive=0)
+          ; Open new stream
+          :method: GET
+          :path: /?echo=saymyname
+          :scheme: http
+          :authority: localhost:8080
+          accept: */*
+          accept-encoding: gzip, deflate
+          user-agent: nghttp2/1.7.1
+[  0.000] recv SETTINGS frame <length=0, flags=0x00, stream_id=0>
+          (niv=0)
+[  0.000] send SETTINGS frame <length=0, flags=0x01, stream_id=0>
+          ; ACK
+          (niv=0)
+[  0.000] recv SETTINGS frame <length=0, flags=0x01, stream_id=0>
+          ; ACK
+          (niv=0)
+[  0.001] recv (stream_id=13) :status: 200
+[  0.001] recv (stream_id=13) content-length: 9
+[  0.001] recv (stream_id=13) content-type: text/plain; charset=utf-8
+[  0.001] recv (stream_id=13) date: Thu, 09 Jun 2016 09:06:05 GMT
+[  0.001] recv (stream_id=13) server: Cowboy
+[  0.001] recv HEADERS frame <length=55, flags=0x04, stream_id=13>
+          ; END_HEADERS
+          (padlen=0)
+          ; First response header
+saymyname[  0.001] recv DATA frame <length=9, flags=0x01, stream_id=13>
+          ; END_STREAM
+[  0.001] send GOAWAY frame <length=8, flags=0x00, stream_id=0>
+          (last_stream_id=0, error_code=NO_ERROR(0x00), opaque_data(0)=[])
+----

examples/echo_post/README.asciidoc

@@ -12,7 +12,7 @@ complex to test. Some browsers feature tools that allow you
 to perform one such request, or you can use the command line
 tool `curl` as we will demonstrate.
 
-== Example output
+== HTTP/1.1 example output
 
 [source,bash]
 ----
@@ -26,3 +26,62 @@ content-type: text/plain; charset=utf-8
 
 echomeplz
 ----
+
+== HTTP/2 example output
+
+[source,bash]
+----
+$ echo echo=echomeplz | nghttp -v -d - http://localhost:8080
+[  0.000] Connected
+[  0.000] send SETTINGS frame <length=12, flags=0x00, stream_id=0>
+          (niv=2)
+          [SETTINGS_MAX_CONCURRENT_STREAMS(0x03):100]
+          [SETTINGS_INITIAL_WINDOW_SIZE(0x04):65535]
+[  0.000] send PRIORITY frame <length=5, flags=0x00, stream_id=3>
+          (dep_stream_id=0, weight=201, exclusive=0)
+[  0.000] send PRIORITY frame <length=5, flags=0x00, stream_id=5>
+          (dep_stream_id=0, weight=101, exclusive=0)
+[  0.001] send PRIORITY frame <length=5, flags=0x00, stream_id=7>
+          (dep_stream_id=0, weight=1, exclusive=0)
+[  0.001] send PRIORITY frame <length=5, flags=0x00, stream_id=9>
+          (dep_stream_id=7, weight=1, exclusive=0)
+[  0.001] send PRIORITY frame <length=5, flags=0x00, stream_id=11>
+          (dep_stream_id=3, weight=1, exclusive=0)
+[  0.001] send HEADERS frame <length=43, flags=0x24, stream_id=13>
+          ; END_HEADERS | PRIORITY
+          (padlen=0, dep_stream_id=11, weight=16, exclusive=0)
+          ; Open new stream
+          :method: POST
+          :path: /
+          :scheme: http
+          :authority: localhost:8080
+          accept: */*
+          accept-encoding: gzip, deflate
+          user-agent: nghttp2/1.7.1
+          content-length: 15
+[  0.001] send DATA frame <length=15, flags=0x00, stream_id=13>
+[  0.001] send DATA frame <length=0, flags=0x01, stream_id=13>
+          ; END_STREAM
+[  0.012] recv SETTINGS frame <length=0, flags=0x00, stream_id=0>
+          (niv=0)
+[  0.012] recv SETTINGS frame <length=0, flags=0x01, stream_id=0>
+          ; ACK
+          (niv=0)
+[  0.012] send SETTINGS frame <length=0, flags=0x01, stream_id=0>
+          ; ACK
+          (niv=0)
+[  0.020] recv (stream_id=13) :status: 200
+[  0.020] recv (stream_id=13) content-length: 10
+[  0.020] recv (stream_id=13) content-type: text/plain; charset=utf-8
+[  0.020] recv (stream_id=13) date: Thu, 09 Jun 2016 09:19:35 GMT
+[  0.020] recv (stream_id=13) server: Cowboy
+[  0.020] recv HEADERS frame <length=57, flags=0x04, stream_id=13>
+          ; END_HEADERS
+          (padlen=0)
+          ; First response header
+echomeplz
+[  0.020] recv DATA frame <length=10, flags=0x01, stream_id=13>
+          ; END_STREAM
+[  0.020] send GOAWAY frame <length=8, flags=0x00, stream_id=0>
+          (last_stream_id=0, error_code=NO_ERROR(0x00), opaque_data(0)=[])
+----

examples/hello_world/README.asciidoc

@@ -9,7 +9,7 @@ $ make run
 
 Then point your browser to http://localhost:8080
 
-== Example output
+== HTTP/1.1 example output
 
 [source,bash]
 ----
@@ -23,3 +23,57 @@ content-type: text/plain
 
 Hello world!
 ----
+
+== HTTP/2 example output
+
+[source,bash]
+----
+$ nghttp -v http://localhost:8080
+[  0.000] Connected
+[  0.000] send SETTINGS frame <length=12, flags=0x00, stream_id=0>
+          (niv=2)
+          [SETTINGS_MAX_CONCURRENT_STREAMS(0x03):100]
+          [SETTINGS_INITIAL_WINDOW_SIZE(0x04):65535]
+[  0.000] send PRIORITY frame <length=5, flags=0x00, stream_id=3>
+          (dep_stream_id=0, weight=201, exclusive=0)
+[  0.000] send PRIORITY frame <length=5, flags=0x00, stream_id=5>
+          (dep_stream_id=0, weight=101, exclusive=0)
+[  0.000] send PRIORITY frame <length=5, flags=0x00, stream_id=7>
+          (dep_stream_id=0, weight=1, exclusive=0)
+[  0.000] send PRIORITY frame <length=5, flags=0x00, stream_id=9>
+          (dep_stream_id=7, weight=1, exclusive=0)
+[  0.000] send PRIORITY frame <length=5, flags=0x00, stream_id=11>
+          (dep_stream_id=3, weight=1, exclusive=0)
+[  0.000] send HEADERS frame <length=38, flags=0x25, stream_id=13>
+          ; END_STREAM | END_HEADERS | PRIORITY
+          (padlen=0, dep_stream_id=11, weight=16, exclusive=0)
+          ; Open new stream
+          :method: GET
+          :path: /
+          :scheme: http
+          :authority: localhost:8080
+          accept: */*
+          accept-encoding: gzip, deflate
+          user-agent: nghttp2/1.7.1
+[  0.008] recv SETTINGS frame <length=0, flags=0x00, stream_id=0>
+          (niv=0)
+[  0.008] recv SETTINGS frame <length=0, flags=0x01, stream_id=0>
+          ; ACK
+          (niv=0)
+[  0.008] send SETTINGS frame <length=0, flags=0x01, stream_id=0>
+          ; ACK
+          (niv=0)
+[  0.013] recv (stream_id=13) :status: 200
+[  0.013] recv (stream_id=13) content-length: 12
+[  0.013] recv (stream_id=13) content-type: text/plain
+[  0.013] recv (stream_id=13) date: Thu, 09 Jun 2016 08:56:56 GMT
+[  0.013] recv (stream_id=13) server: Cowboy
+[  0.013] recv HEADERS frame <length=46, flags=0x04, stream_id=13>
+          ; END_HEADERS
+          (padlen=0)
+          ; First response header
+Hello world![  0.013] recv DATA frame <length=12, flags=0x01, stream_id=13>
+          ; END_STREAM
+[  0.013] send GOAWAY frame <length=8, flags=0x00, stream_id=0>
+          (last_stream_id=0, error_code=NO_ERROR(0x00), opaque_data(0)=[])
+----