FastCGI Extension 1.5 for IIS 6.0 and IIS 5.1 LockedRSS

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Last post Apr 20, 2009 06:10 PM by ruslany

  • FastCGI Extension 1.5 for IIS 6.0 and IIS 5.1

    Apr 20, 2009 06:10 PM|ruslany|LINK

    Today IIS team has released the FastCGI Extension 1.5 for IIS 6.0 and IIS 5.1 - Beta. This version is based on FastCGI Extension 1.0 and it adds several important improvements and features.

    Install the Beta of FastCGI Extension 1.5 for IIS 6.0 and IIS 5.1

    Install with Web Platform Installer 

    or, download:

    FastCGI Extension 1.5 for IIS 6.0 and IIS 5.1 (x86)

    FastCGI Extension 1.5 for IIS 6.0 and IIS 5.1 (x64)

    Upgrade from FastCGI Extension 1.0 release

    If you already have FastCGI Extension version 1.0 installed then the installation package will upgrade it to version 1.5. All the related IIS configuration and settings in fcgiext.ini file will be preserved during upgrade. Note that during upgrade the comments in fcgiext.ini will not be updated and will not mention new configuration settings. However the new settings can still be used after upgrade.

    New Features

    The FastCGI Extension 1.5 includes these new features:

    • Monitor changes to a file. The extension can be configured to listen for file change notifications on a specific file and when that file changes, the extension will recycle FastCGI processes for the process pool. This feature can be used to recycle PHP processes when changes to php.ini file occur.

    • Real-time tuning of MaxInstances setting. This MaxInstances setting dictates the maximum number of FastCGI processes which can be launched for each application pool. If it is set to 0 then FastCGI extension will automatically adjust the number of instances up or down every few seconds based on the system load and number of requests waiting in the queue. 

    • STDERR stream handling. There are several options of how the extension can handle text sent by FastCGI application on STDERR. The extension can send the error data as a failure response to the HTTP client or it can ignore the error and send whatever was received on STDOUT as a response with 200 status code.

    • Sending a termination signal to FastCGI processes. The extension can be configured to send a termination signal to FastCGI process before terminating it. This enables FastCGI process to do a clean shutdown before getting killed.

    • _FCGI_X_PIPE_ environment variable. This variable is set by FastCGI extension and it contains the name of the named pipe that is used for communication between the extension and FastCGI process.

    • Relaxed enforcement of response headers syntax. The FastCGI extension has less strict enforcements for the correctness of the response headers.

    FCGI Library ver2

    Over the last few months, Coast Research has developed a second generation FCGI library (libfcg2.dll) with a handler for the termination signal introduced in this release. This library was developed in conjunction with this release leading to the inclusion of the_FCGI_X_PIPE_ environment variable and the termination signal (defined by the SignalBeforeTerminateSeconds configuration setting) to provide the ability to gracefully shutdown a FastCGI application (releasing database handles and other resources for example) before getting killed.

    The library maintains a large degree of compatibility with the original dll, adding direct access to most used request parameters like: QUERY_STRING, CONTENT_LENGTH and Request Method (to avoid slow string and parsing operations for each request), while retaining the legacy request variable structure.

    Also added:

    • Direct random access to STDIN/STDOUT/STDERR streams
    • Error handing with full text descriptions
    • Debug mode for examining FCGI Record flow
    • Optimized (in place) URL decoding

    libfcgi2.dll (39k) headers, examples and binaries are freely available from

    More information

    Refer to the following resources for more information