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Module proxy

cloudflare_quick_tunnel

Module proxy 

Source
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Per-request HTTP/1.1 proxy: bridge an inbound capnp-framed stream from the edge to the local TCP listener the caller wants to expose at https://<sub>.trycloudflare.com.

Wire flow on the edge → tunnel side:

  1. Edge writes the data-stream preamble + ConnectRequest (parsed by stream::read_connect_request).
  2. We connect a TCP socket to 127.0.0.1:<local_port> and write a re-synthesised HTTP/1.1 request line + Host + every HttpHeader:<Name> the edge forwarded + an empty line. Body bytes (if any) follow from the QUIC stream.
  3. We parse the HTTP/1.1 response status + headers off the TCP socket, write them back as a ConnectResponse (status in HttpStatus, each header in HttpHeader:<Name>), and finally byte-pump the response body from TCP to QUIC.

Mirrors cloudflared/connection/quic_connection.go (buildHTTPRequest + httpResponseAdapter).

Structs§

StreamCounters
Byte counters the supervisor accumulates across all streams. Cheap atomics so the proxy task can update without coordination.

Constants§

LOCAL_CONNECT_TIMEOUT
How long we wait for the local TCP listener to accept the first byte. Quick tunnels are usually pointed at a process that just finished booting; 5s is generous without making real failures drag out.

Functions§

handle_inbound_stream
Drive one inbound request stream to completion. Reads the ConnectRequest off recv, runs the matching proxy strategy, writes the ConnectResponse back, and pumps the body bytes.