What is this?

A web server and an implementation of the HTTP/2 over TCP protocol, written in Go.

Getting started

Define endpoints in main.go and start the server:

cd h2c
go run .

To execute a single request:

curl --http2 http://localhost:80/ping

To execute multiple requests in the same session:

curl --http2 -X POST http://localhost:80/echo -d "It " -: -X POST http://localhost:80/echo -d "works."

Frames

Example of a HTTP/2 SETTINGS frame coming from a client:
50 52 49 20 2a 20 48 54 54 50 2f 32 2e 30 0d 0a 0d 0a 53 4d 0d 0a 0d 0a - "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n", connection preface
00 00 12 - payload length; 18 bytes
04 - frame type; SETTINGS
00 - frame flags; none
00 00 00 00 - stream identifier; for the whole connection in this case
00 03 00 00 00 64 | 00 04 00 a0 00 00 | 00 02 00 00 00 00 - payload; 3 settings, 2 bytes for setting id, 4 for a value

Actual settings:
SETTINGS_MAX_CONCURRENT_STREAMS (0x3) = 0x64 = 100
SETTINGS_INITIAL_WINDOW_SIZE (0x4) = 0x00a00000 = 10485760 bytes
SETTINGS_ENABLE_PUSH (0x2) = 0x0 = disabled\

Wireshark (for example) supports visualization of frames from this protocol.