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1 Client system sends a request to the Web server The Web server determines if the request needs to be serviced by a CGI program or not 2 The Web server creates a new CGI process and the process initializes itself The Web server passes various request-related information to the program via environment variables Depending on the request method (GET or POST), the user data is stored in either an environment variable called QUERY_STRING or put in the process s standard input 3 The CGI application performs its tasks and sends all its output to the standard output, which the Web server reads and parses (with the exception of nonparsed header applications) 4 The CGI program exits and the server returns the CGI output to the client 5 The output of the CGI program is sent to the client system FastCGI processes are persistent After finishing a request, they wait for a new request instead of exiting, as shown in Figure 14-3

Much to our advantage, the Active Directory does a good job of configuring its own replication topology and solving replication problems as they occur. The following sections point out the most common replication problems and show you how the Active Directory resolves these issues.

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In the case of nonparsed header applications, the CGI application is responsible for producing appropriate HTTP headers, and in all other cases the Web server produces appropriate HTTP headers based on the content type found in the STDOUT of the program The Web server logs any error information that is written to the CGI program s standard error The Web server creates FastCGI application processes to handle requests The processes may be created at startup or on demand The FastCGI program initializes itself and waits for a new connection from the Web server Client request processing in a single-threaded FastCGI application proceeds as follows: 1 When a client request comes in, the Web server decides if the connection needs to be handled by a FastCGi program or not 2 If the request needs to be serviced by a FastCGI program, the Web server then opens a connection to the FastCGI process, which is already running 3 The server sends the CGI environment variable information and standard input over the connection The FastCGI process sends the standard output and error information back to the server over the same connection and then the FastCGI process closes the connection 4 The Web server responds to the client with the data that has been sent by the FastCGI process, completing the request The FastCGI process then waits for another connection from the Web server

Figure 12.1 Water treatment plant, with number of measurements shown at different points in the system

As you already know, unlike a CGI program, a FastCGI program keeps running after it processes a request This allows it to process future requests as soon as they come, and also makes the architecture of the FastCGI program different from a CGI program A CGI program executes sequentially and exits, whereas a FastCGI program executes sequentially and loops forever Figure 14-4 shows the basic architecture of a FastCGI application As the figure shows, a FastCGI program typically has an initialization code segment and a response loop segment that encapsulates the body of the program The initialization code is run exactly once, when the application is initialized Initialization code usually performs time-consuming operations such as opening databases or calculating values for tables The response loop runs continuously, waiting for client requests to arrive The loop starts with a call to FCGI_Accept, a routine in the FastCGI library The FCGI_Accept routine blocks program execution until a client requests the FastCGI application When a client request comes in, FCGI_Accept unblocks, runs one iteration of the response loop body, and then blocks again, waiting for another client request The loop terminates only when the system administrator or the Web server kills the FastCGI application

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