Ignores experimental range frames?

[wbl]

leftshark.tls13.com returns two unknown frames, one with type 0xc, and the other in the experimental range. h2 only produces one UnknownFrameEvent with type 0xc and ignores the experimental range frame entirely. I haven't tracked down the cause yet, and it might be anywhere in the dependency tree.

[Lukasa]

Hrm, it'd be really interesting to see a quick bit of example code that reproduces the problem so that I can check what's happening in hyper-h2. Certainly both should produce an UnknownFrameEvent.

[wbl]

Leftshark has been modified to produce 3 unknown frames, one of which should have a large type (not the frames of type 12 which are received correctly). The following reproduces the issue.

import socket
import h2
import h2.connection
import h2.events
import ssl
import sys

def get_url(host, port, path):
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.connect((host, port))
    ssl_ctx = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
    ssl_ctx.verify_mode=ssl.CERT_NONE
    ssl_ctx.set_alpn_protocols(['h2'])
    tls=ssl_ctx.wrap_socket(s, server_hostname=host)
    conn = h2.connection.H2Connection()
    conn.initiate_connection()
    tls.sendall(conn.data_to_send())
    sid = conn.get_next_available_stream_id()
    conn.send_headers(sid, [
        ( ':method', 'GET'),
        ( ':authority', host),
        ( ':scheme', 'https'),
        ( ':path', path)])
    tls.sendall(conn.data_to_send())
    while 1:
        data = tls.recv(1024)
        if not data: break
        events = conn.receive_data(data)
        for event in events:
            print event
            if isinstance(event, h2.events.StreamEnded):
                sys.exit(0)
            if isinstance(event, h2.events.UnknownFrameReceived):
                print event.frame.type
            
get_url("leftshark.tls13.com", 443, "/")

Thanks for looking into this.