- Add forwarding_try_splice() with Linux splice syscall for zero-copy data transfer between client and upstream sockets, reducing CPU overhead by avoiding userspace buffer copies
- Remove stale config list management in config hot reload, replacing it with direct config reference counting to simplify memory handling and eliminate potential use-after-free bugs
- Fix connection event handling to process buffered data when upstream closes, preventing data loss during connection teardown
- Close existing upstream connection before establishing new one in upstream_connect(), preventing duplicate connections for the same client
- Add author comment with retoor <retoor@molodetz.nl> at top of Makefile
- Include 12 new source files (config_parser, http_response, client_handler, upstream, forwarding, base64, socket_utils, epoll_utils, time_utils, histogram, deque, rate_tracker, stats_collector) to SOURCES and TEST_LIB_SOURCES
- Add corresponding backup copies of auth.c, config.c, connection.c, and monitor.c to src/backup/ directory
Add detection of pipelined requests in handle_client_read by checking if buffered data starts with a new HTTP request. When a pipelined request is detected, the server now sends a 400 Bad Request response with a descriptive body, closes the upstream connection, and transitions the client state to CLIENT_STATE_CLOSING. Previously, the server would silently close the upstream connection and continue reading headers. The change also includes a comprehensive test that validates the rejection behavior, response content, and connection state transitions for pipelined requests.
Add logic in connection_close to detect remaining buffered data on client read buffer when an upstream connection is closed, and invoke handle_client_read to process it. Also add a forward declaration for handle_client_read and include debug logging for routing decisions. A new test validates that pipelined requests buffered before upstream close are correctly handled.
Reset multiple connection flags (content_type_checked, is_textual_content, response_headers_parsed, original_content_length, content_length_delta, patch_blocked) when reusing connection for internal route keep-alive. Add immediate handling of any buffered read data after state reset to prevent stale data blocking subsequent requests. Add comprehensive test verifying second request processing on internal dashboard route via Unix socket pair.
Add real-time tracking of accepted connections, upstream connection success/failure, DNS errors, and retries to connection.c. Introduce histogram, rate tracker, and health score data structures in types.h and monitor.h/c. Redesign dashboard HTML/CSS with color-coded health metrics, responsive charts grid, and tall chart containers for improved visualization of system performance data.
