ExternalAppClass directive in .NET framework

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ExternalAppClass directive
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Use this directive when you have a FastCGI application running on another system Syntax: ExternalAppClass FastCGI_application_name [-host
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host:port] [-socket sock_name]
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Context: Server config In the following example, the echofcg application is running on a host called fcginiteccom and listening to port 9090 The <FastCGI-application-name> is just an identifier that can be used to describe the application running on the remote host, so it can be any name you want Make sure the name you choose is not already used in another AppClass or ExternalAppClasss directive
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ExternalAppClass echofcg -host fcginiteccom:9090
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The optional parameters to the ExternalAppClass directive are: host This option enables you to specify the host and the TCP port number of the FastCGI application running on another system Use host:port format to specify the host and port You can use either a hostname or an IP address socket This option enables you to specify the pathname of the Unix domain socket being used by a FastCGI application
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FastCgiIpcDir directive
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This directive specifies the default path for Unix domain sockets created by the module The default /tmp location is fine as long as you do not have cron jobs set up to clean up your /tmp directory from time to time Syntax: FastCgiIpcDir path_to_UNIX_domain_socket Default: FastCgiIpcDir /tmp Context: Server config The socket name has the following format:
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OM_WS_npid n is a number and pid is the process ID of the main Apache process If you do set
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this directive to a path, make sure only Apache has read and write access to the directory
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Configuring httpdconf for FastCGI
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To configure FastCGI applications, you need a combination of mod_fastcgi directives and directives provided by the Apache server Use the AppClass directive to start the FastCGI applications that you want to be managed by this Web server The applications are managed in the sense that the server logs an error message when a managed process dies and attempts to restart managed processes that die Use one or both of the AppClass and ExternalAppClass directives to define an association between a pathname and the connection information for a FastCGI application Connection information is either the pathname of a Unix domain socket or the IP address and port number of a TCP port The difference between the two directives is this: A single AppClass directive both starts an application and sets up the association for communicating with it, whereas ExternalAppClass only defines the association In the case of AppClass, the pathname used in the association is always the pathname of the application s executable; with ExternalAppClass, the pathname is arbitrary
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14 Configuring Apache for FastCGI
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For an HTTP request to be processed by mod_fastcgi, the request s handler must be fastcgi-script or the request s MIME type must be application/x-httpd-fcgi Apache provides several ways to set the handler and MIME type of a request: SetHandler (in the context of a Location or Directory section or per-directory access control file) can associate the handler fastcgi-script with a specific file or all the files in a directory AddHandler can associate the handler fastcgi-script with files based on file extension ForceType (in the context of a Location or Directory section or htaccess file) can associate the MIME type application/x-httpd-fcgi with a specific file or all the files in a directory AddType can associate the MIME type application/x-httpd-fcgi with files based on file extension After the mod_fastcgi module is configured, it handles requests as follows: 1 The connection information associated with the requested pathname is retrieved If no connection information is associated with the pathname, the server returns the error code 404 Not Found 2 The mod_fastcgi module connects to the FastCGI application process If the connection attempt fails, the server returns 500 Server Error 3 The request is transmitted to the FastCGI application process, which generates a response 4 The application s response is received and transformed into an HTTP response The server sends this response back to the client You should back up your existing httpdconf file but do not use the example configuration file in Listing 14-4 right away It is a minimal configuration that only uses the httpdconf file for testing purposes Use this configuration for initial testing with FastCGI, and when you ve verified that this configuration works, merge the FastCGI-specific aspects of this configuration with your own configuration
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