cowboy/examples/echo_post

= POST parameter echo example

To try this example, you need GNU `make` and `git` in your PATH.

To build and run the example, use the following command:

[source,bash]
$ make run

As this example echoes a POST parameter, it is a little more
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.

== HTTP/1.1 example output

[source,bash]
----
$ curl -i -d echo=echomeplz http://localhost:8080
HTTP/1.1 200 OK
connection: keep-alive
server: Cowboy
date: Fri, 28 Sep 2012 04:12:36 GMT
content-length: 9
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
(niv=2)
[SETTINGS_MAX_CONCURRENT_STREAMS(0x03):100]
[SETTINGS_INITIAL_WINDOW_SIZE(0x04):65535]
[ 0.000] send PRIORITY frame
(dep_stream_id=0, weight=201, exclusive=0)
[ 0.000] send PRIORITY frame
(dep_stream_id=0, weight=101, exclusive=0)
[ 0.001] send PRIORITY frame
(dep_stream_id=0, weight=1, exclusive=0)
[ 0.001] send PRIORITY frame
(dep_stream_id=7, weight=1, exclusive=0)
[ 0.001] send PRIORITY frame
(dep_stream_id=3, weight=1, exclusive=0)
[ 0.001] send HEADERS frame
; 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
[ 0.001] send DATA frame
; END_STREAM
[ 0.012] recv SETTINGS frame
(niv=0)
[ 0.012] recv SETTINGS frame
; ACK
(niv=0)
[ 0.012] send SETTINGS frame
; 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
; END_HEADERS
(padlen=0)
; First response header
echomeplz
[ 0.020] recv DATA frame
; END_STREAM
[ 0.020] send GOAWAY frame
(last_stream_id=0, error_code=NO_ERROR(0x00), opaque_data(0)=[])
----