[zuudevs]

Summary

Adds the first public end-to-end HTTP execution path through Client, connecting the already-merged URL, HTTP serialization/parsing, resolver, and TCP transport layers.

Public API

• include/cpp_request/client.hpp
  • stateful Client
  • request(const Request&)
  • member helpers for GET, HEAD, POST, PUT, PATCH, DELETE
  • configurable connect/read/write timeouts
  • one-shot free helpers for the same methods
  • default timeouts: 5s connect, 30s read, 30s write

Execution pipeline

Client::request() now performs:

1. request serialization and URL validation
2. OS-backed endpoint resolution
3. timed TCP connection establishment
4. request-head transmission
5. zero-copy request-body transmission
6. incremental socket reads
7. incremental HTTP/1.1 response parsing
8. completed owning Response return

Timeout semantics

• connect timeout bounds TCP connection establishment
• write timeout is one shared budget for the complete request transmission (head + body)
• read timeout applies to each read_some() operation, matching the transport contract

EOF/error behavior

• transport ConnectionClosed is treated as HTTP EOF and passed to ResponseParser::finish_eof()
• valid close-delimited responses therefore complete successfully
• premature closure of Content-Length/chunked responses maps to parser UnexpectedEof
• other transport, URL, DNS, timeout, and protocol errors propagate through Result<Response>

Tests

Adds local loopback end-to-end coverage for:

• custom-header GET request and Content-Length response
• POST body transmission and automatic Content-Length
• chunked response decoding through the full Client path
• close-delimited response completion on peer close
• malformed response propagation
• unsupported HTTPS rejection before networking

All integration tests use local ephemeral loopback sockets only.

Scope

This PR intentionally opens a fresh TCP connection for every request. It does not implement persistent connection reuse or redirect handling yet. Those remain isolated follow-up changes so the basic execution pipeline can stabilize first.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Propagate connection resets instead of treating them as EOF

When a close-delimited response is interrupted by ECONNRESET/WSAECONNRESET, TcpConnection::read_some() reports ConnectionClosed with a nonzero native error, so this branch calls finish_eof() and returns the partially received body as a successful response. Only an orderly recv() == 0 closure is valid EOF; reset-style closures must remain errors to avoid silently accepting truncated response data.

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