This package contains an HTTP/2 client and server implementation for Tornado. It is currently under development and interfaces are subject to change.

pip install git+https://github.com/bdarnell/tornado_http2.git

This package has only been tested with Tornado 4.5 on Python 2.7.10+ and 3.5.

Two server classes are provided:

• tornado_http2.server.Server only supports HTTP/2 over HTTPS connections and will use HTTP/1 for all unencrypted connections.
• tornado_http2.server.CleartextHTTP2Server supports HTTP/2 for both HTTP and HTTPS connections. Note that most browsers will only use HTTP/2 over HTTPS, and CleartextHTTP2Server is a little slower than a regular Server, so it is mainly provided for testing purposes.

Both server classes can be used in two different ways: either instantiate them directly in place of a tornado.httpserver.HTTPServer:

server = tornado_http2.server.Server(app, ssl_options=...)
server.listen(...)

Or use HTTPServer.configure to change all HTTPServers in the process, including those created by methods like Application.listen or AsyncHTTPTestCase:

tornado.httpserver.HTTPServer.configure('tornado_http2.server.Server')
app.listen(...)

Three client classes are provided:

• tornado_http2.client.Client only supports HTTP/2 over HTTPS and will use HTTP/1 for all unencrypted connections.
• tornado_http2.client.ForceHTTP2Client only supports HTTP/2 and will use it for both HTTP and HTTPS. Since it cannot talk to HTTP/1 servers, it is mainly for testing purposes.
• tornado_http2.curl.CurlAsyncHTTP2Client requires a version of libcurl that is compiled with HTTP/2 support, and supports HTTP/2 over both HTTP and HTTPS, falling back to HTTP/1 when HTTP/2 is unsupported.

Both client classes can be used in two different ways: either instantiate them directly in place of a tornado.httpclient.AsyncHTTPClient (be careful with AsyncHTTPClient's instance-sharing magic):

client = tornado_http2.client.Client(force_instance=True)

Or use AsyncHTTPClient.configure to change all AsyncHTTPClients in the process:

tornado.httpclient.AsyncHTTPClient.configure('tornado_http2.client.Client')