h2_http2_connection_init_and_get_request_headers.py

1import h2.connection
2import h2.events
3
4# 1. Create a new HTTP/2 connection object.
5connection = h2.connection.H2Connection()
6
7# 2. Initialize the connection.
8# This sends the HTTP/2 client connection preface.
9connection.initiate_connection()
10
11# 3. Create request headers.
12# HTTP/2 headers must be a list of tuples and include pseudo-headers.
13request_headers = [
14    (':method', 'GET'),
15    (':path', '/'),
16    (':authority', 'http2.golang.org'),
17    (':scheme', 'https'),
18    ('user-agent', 'h2/1.0.0'),
19]
20
21# 4. Open a stream and send the headers.
22# Stream IDs are always odd for client-initiated streams.
23connection.send_headers(stream_id=1, headers=request_headers, end_stream=True)
24
25# 5. Get the data to be sent over the network.
26data_to_send = connection.data_to_send()
27
28# Note: In a real application, you would now write 'data_to_send' 
29# to a socket and enter a loop to read response data and pass it
30# to connection.receive_data(data).
31print(f"Data to send to server: {data_to_send!r}")