2.3.0 (2026-09-13)

• #112: allow serving custom HTTP responses for non-upgrade requests
• Validate incoming HTTP request lines (GET, non-empty target, HTTP/1.1), header names and values
  (token names, no folded headers or invalid control characters, 128-header limit), and body framing
  (no Transfer-Encoding; Content-Length, when present, must be a single zero value).
• Add WSUpgradeResponse.create_ok_response for constructing HTTP 200 responses
• Add HTTPS proxy support to ws_connect, including proxy authentication and a separate
  proxy_ssl_context for the TLS connection to the proxy