Websockets (#37)

* Working echo websockets server
Written a simple example of a websocket server that echoes the messages received from the user.
It still doesn't handle particular cases of the ASGI spec like subprotocols and closing connections.

* Use system python version in pkg-config

* Raise IOError when websocket connection is closed

* Complete implementation of websocket asgi spec

* Fix clang-format error

* Remove websockets from fastapi tests

* Integration tests for websockets using socketio

* Use body length in response buffer for better conversion between c and go

* Fix copy_pystring

.github/workflows/integration_tests.yaml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        tool-name: ['flask', 'fastapi', 'simple', 'simple_async']
+        tool-name: ['flask', 'fastapi', 'simple', 'simple_async', 'socketio']
         python-version: ['3.9', '3.10', '3.11', '3.12']
     env:
       GOEXPERIMENT: cgocheck2

README.md

@@ -10,6 +10,10 @@ Supports both WSGI and ASGI, which means you can run all types of frameworks lik
 
 ## Quickstart
 
+```
+CGO_ENABLED=1 xcaddy build --with github.com/mliezun/caddy-snake
+```
+
 #### Requirements
 
 - Python >= 3.9 + dev files