<!--#if expr= ($win = yes && $loss = false) != ($profit = yes) --> in .NET

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<!--#if expr= ($win = yes && $loss = false) != ($profit = yes) -->
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Here, the ($win = yes && $loss = false) is evaluated before the != operator is evaluated Anything that is not recognized as a variable or as an operator is treated as a string Strings can also be quoted, like this: string Unquoted strings cannot contain white space (blanks and tabs) because they are used to separate tokens such as variables If multiple strings are found in a row, they are concatenated using blanks If you require more complex flow control constructs, you can use the following:
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<!--#if expr= test_condition1 --> Do something specific to the first test condition <!--#elif expr= test_condition2 --> Do something specific to the first second condition <!--#else --> Do something as default <!--#endif -->
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13 Server Side Includes (SSI)
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The elif enables you to create an else-if condition For example:
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<!--#if expr= ${HTTP_USER_AGENT} = /MSIE/ --> <!--#set var= browser value= MicrosoftIE --> <!--#include flie= mypageasp --> <!--#else --> <!--#set var= browser value= Others --> <!--#include flie= mypagehtml --> <!--#endif -->
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Here, the HTTP_USER_AGENT variable is checked to determine whether it contains the string MSIE (a string used by Microsoft Internet Explorer browser) If it does contain this string, then the browser variable is set to MicrosoftIE, and a file named mypageasp is inserted in the current document On the other hand, if the HTTP_USER_AGENT does not contain the MSIE string, it is assumed to be the another browser (such as Netscape Navigator, Lynx), and thus the browser variable is set to Others and the mypagehtml file is inserted in the current document By using the if-then-else construct, this example sets a different value to the same variable and loads different files
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his chapter discusses FastCGI and how it solves the performance problems inherent in CGI, without introducing the overhead and complexity of proprietary APIs FastCGI is fast, open, and maintainable It offers features such as in-memory caching, persistent connections, and distributed architecture The migration path from CGI to FastCGI is also reasonably simple
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C H A P T E R
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In This
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Explaining FastCGI Describing the basic architecture of a FastCGI application Compiling and installing the FastCGI module for Apache Configuring
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What is FastCGI
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Simply speaking, a FastCGI application acts like a server application, which is often called a daemon in the Unix world Unlike a CGI script, a FastCGI application is persistent and services all incoming requests by using a single instance, eliminating the overhead of starting a new process per request as in the CGI version For example, if you need to generate a set of dynamic pages by using contents from a database, a CGI script has to connect to the database every time it is run per request On the other hand, a FastCGI application can connect once and keep the connection alive for all the subsequent requests, and this time-saving results in higher performance Hence, FastCGI is considered a highperformance alternative to CGI for writing Web-server applications in a variety of languages, including Perl, C, C++, Java, and Python The existence of CGI, FastCGI, and the Server API creates a great deal of confusion for developers and server administrators To shed some light on this murky subject, Table 14-1 provides some key feature comparisons among these technologies
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Table 14-1 Comparing CGI, Server API, and FastCGI
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Feature Programming language dependency CGI Language independent CGI applications can be written in almost any programming language (usually C/C++) Applications separate processes; buggy applications cannot crash the Web server or access the server s private internal state and compromise security Bugs in the core server can corrupt applications Open standard Some form of CGI has been implemented on every Web server Server API Applications have to be written in a language supported by the vendor API programming language Feature not supported Because the FastCGI applications run in the server s address space, buggy applications can corrupt the core server FastCGI Language independent Like CGI, FastCGI applications can be written in any programming language
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