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* handle socket options for UNIX socket same as others * set FD_CLOEXEC by default * invoke `socket_options` callback if set * Offer Client info even on UNIX socket based Server HTTP Request header "REMOTE_PORT" contains client process id if possible when Server works on UNIX socket. * retrigger checks * retrigger checks * add support macOS Co-authored-by: Changbin Park <changbin.park@ahnlab.com>