FILES ----- */etc/nghttpx/nghttpx.conf* The default configuration file path nghttpx searches at startup. The configuration file path can be changed using :option:`--conf` option. Those lines which are staring ``#`` are treated as comment. The option name in the configuration file is the long command-line option name with leading ``--`` stripped (e.g., ``frontend``). Put ``=`` between option name and value. Don't put extra leading or trailing spaces. The options which do not take argument in the command-line *take* argument in the configuration file. Specify ``yes`` as an argument (e.g., ``http2-proxy=yes``). If other string is given, it is ignored. To specify private key and certificate file which are given as positional arguments in command-line, use ``private-key-file`` and ``certificate-file``. :option:`--conf` option cannot be used in the configuration file and will be ignored if specified. SIGNALS ------- SIGQUIT Shutdown gracefully. First accept pending connections and stop accepting connection. After all connections are handled, nghttpx exits. SIGUSR1 Reopen log files. SIGUSR2 Fork and execute nghttpx. It will execute the binary in the same path with same command-line arguments and environment variables. After new process comes up, sending SIGQUIT to the original process to perform hot swapping. SERVER PUSH ----------- nghttpx supports HTTP/2 server push in default mode. nghttpx looks for Link header field (`RFC 5988 `_) in response headers from backend server and extracts URI-reference with parameter ``rel=preload`` (see `preload `_) and pushes those URIs to the frontend client. Here is a sample Link header field to initiate server push: .. code-block:: http Link: ; rel=preload Link: ; rel=preload Currently, the following restriction is applied for server push: 1. The associated stream must have method "GET" or "POST". The associated stream's status code must be 200. This limitation may be loosened in the future release. UNIX DOMAIN SOCKET ------------------ nghttpx supports UNIX domain socket with a filename for both frontend and backend connections. Please note that current nghttpx implementation does not delete a socket with a filename. And on start up, if nghttpx detects that the specified socket already exists in the file system, nghttpx first deletes it. However, if SIGUSR2 is used to execute new binary and both old and new configurations use same filename, new binary does not delete the socket and continues to use it. OCSP STAPLING ------------- OCSP query is done using external Python script ``fetch-ocsp-response``, which has been originally developed in Perl as part of h2o project (https://github.com/h2o/h2o), and was translated into Python. The script file is usually installed under ``$(prefix)/share/nghttp2/`` directory. The actual path to script can be customized using :option:`--fetch-ocsp-response-file` option. If OCSP query is failed, previous OCSP response, if any, is continued to be used. TLS SESSION RESUMPTION ---------------------- nghttpx supports TLS session resumption through both session ID and session ticket. SESSION ID RESUMPTION ~~~~~~~~~~~~~~~~~~~~~ By default, session ID is shared by all worker threads. If :option:`--tls-session-cache-memcached` is given, nghttpx will insert serialized session data to memcached with ``nghttpx:tls-session-cache:`` + lowercased hex string of session ID as a memcached entry key, with expiry time 12 hours. Session timeout is set to 12 hours. TLS SESSION TICKET RESUMPTION ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ By default, session ticket is shared by all worker threads. The automatic key rotation is also enabled by default. Every an hour, new encryption key is generated, and previous encryption key becomes decryption only key. We set session timeout to 12 hours, and thus we keep at most 12 keys. If :option:`--tls-ticket-key-memcached` is given, encryption keys are retrieved from memcached. nghttpx just reads keys from memcached; one has to deploy key generator program to update keys frequently (e.g., every 1 hour). The example key generator tlsticketupdate.go is available under contrib directory in nghttp2 archive. The memcached entry key is ``nghttpx:tls-ticket-key``. The data format stored in memcached is the binary format described below:: +--------------+-------+----------------+ | VERSION (4) |LEN (2)|KEY(48 or 80) ... +--------------+-------+----------------+ ^ | | | +------------------------+ (LEN, KEY) pair can be repeated All numbers in the above figure is bytes. All integer fields are network byte order. First 4 bytes integer VERSION field, which must be 1. The 2 bytes integer LEN field gives the length of following KEY field, which contains key. If :option:`--tls-ticket-key-cipher`\=aes-128-cbc is used, LEN must be 48. If :option:`--tls-ticket-key-cipher`\=aes-256-cbc is used, LEN must be 80. LEN and KEY pair can be repeated multiple times to store multiple keys. The key appeared first is used as encryption key. All the remaining keys are used as decryption only. If :option:`--tls-ticket-key-file` is given, encryption key is read from the given file. In this case, nghttpx does not rotate key automatically. To rotate key, one has to restart nghttpx (see SIGNALS). SEE ALSO -------- :manpage:`nghttp(1)`, :manpage:`nghttpd(1)`, :manpage:`h2load(1)`