qh3

import asyncio import ssl from qh3.quic.configuration import QuicConfiguration from qh3.asyncio.client import connect from qh3.h3.connection import H3Connection from qh3.h3.events import DataReceived, HeadersReceived async def fetch_http3_url(url: str): # Create a QUIC configuration configuration = QuicConfiguration( is_client=True, alpn_protocols=["h3-29"], max_datagram_frame_size=65536, # Set up a basic TLS context. For production, use proper certificate validation. # In this example, we disable it for simplicity, NOT recommended for production. verify_mode=ssl.CERT_NONE, # You can add root CAs if needed: ciphers=[...], root_cert=b"..." ) print(f"Connecting to {url}...") async with connect(url, configuration=configuration) as client: print(f"Connected to {url}. Client: {client}") h3_connection = H3Connection(client.quic.configuration) # Send a GET request stream_id = client.quic.get_next_available_stream_id() headers = [ (b":method", b"GET"), (b":scheme", b"https"), (b":authority", client.host.encode()), (b":path", b"/"), (b"user-agent", b"qh3-client"), ] h3_connection.send_headers(stream_id, headers) await client.transmit() # Receive response data = b'' while True: events = h3_connection.handle_quic_events(client.quic.receive()) for event in events: if isinstance(event, HeadersReceived): print("Received headers:") for k, v in event.headers: print(f" {k.decode()}: {v.decode()}") elif isinstance(event, DataReceived): data += event.data if client.quic.is_idle: # Check if the QUIC connection is idle (all data received/sent) break await asyncio.sleep(0.01) # Yield to event loop print("\n--- Response Body ---") print(data.decode(errors='ignore')) # Ignore decoding errors for simplicity # Example Usage: # You need a running HTTP/3 server to test this. # For local testing, you might use `mkcert` to generate a trusted cert for 'localhost' # and run a server like `aioquic/examples/http3_server.py` adapted for qh3. # This example targets a public HTTP/3 enabled endpoint for demonstration, # but actual connectivity depends on network and server configuration. # Replace with a known HTTP/3 server if available # Note: Public HTTP/3 test servers are not always stable or available. # For best results, run a local qh3/aioquic compatible server. # Example for aioquic server: `python -m aioquic.examples.http3_server --host 127.0.0.1 --port 4433 cert.pem key.pem` # and then use url = "https://127.0.0.1:4433/" # A real-world example would involve a public URL known to support HTTP/3. # For this example, we'll try a common one, but it might require a local setup. url = os.environ.get('QH3_TEST_URL', 'https://quic.tech:8443/') async def main(): await fetch_http3_url(url) if __name__ == '__main__': import os import logging # Set basic logging for better visibility logging.basicConfig(level=logging.INFO) asyncio.run(main())