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Tatsuhiko Miyagawa


PSGI::Extensions - PSGI extentions


The PSGI environment MAY include the following additional extensions. They are OPTIONAL and applications and middleware components SHOULD check if they exist in the environment before using the functionality provided.

  • psgix.io: The raw IO socket to access the client connection to do low-level socket operations. This is only available in PSGI servers that run as an HTTP server, and should be used when (and only when) you want to jailbreak out of PSGI abstraction, to implement protocols over HTTP such as BOSH or WebSocket.

  • psgix.input.buffered: A boolean which is true if the HTTP request body (for POST or PUT requests) is buffered using a temporary filehandle or PerlIO in psgi.input. When this is set, applications or middleware components can safely read from psgi.input without worrying about non-blocking I/O and then can call seek to rewind the input for the transparent access.

  • psgix.logger: A code reference to log messages. The code reference is passed one argument as a hash reference that represents a message to be logged. The hash reference MUST include at least two keys: level and message where level MUST be one of the following strings: debug, warn, info, error and fatal. message SHOULD be a plain string or a scalar variable that stringifies.

  • psgix.session: A hash reference for storing and retrieving session data. Updates made on this hash reference SHOULD be persisted by middleware components and SHOULD be restored in the succeeding requests. How to persist and restore session data, as well as how to identify the requesting clients are implementation specific.

    psgix.session.options: A hash reference to tell Middleware components how to manipulate session data after the request. Acceptable keys and values are implementation specific.

  • psgix.harakiri: A boolean which is true if the PSGI server supports harakiri mode, that kills a worker (typically a forked child process) after the current request is complete.

    psgix.harakiri.commit: A boolean which is set to true by the PSGI application or middleware when it wants the server to kill the worker after the current request.


Copyright Tatsuhiko Miyagawa, 2009-2011.

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