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This chapter will introduce the Apache API with a general overview It will give information about how Apache handles Web requests (ie, what is going on under the hood)
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Modules
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Modules are the first critical component of the Apache API A module is a bit of code written to handle a specific task, such as logging, authentication, directory and alias handling, access control, content negotiation, and CGI and Server-Side Includes Most of Apache is implemented as a module the Apache core handles some pieces of the server but generally hands processing off to a module Each module can be compiled into Apache, similar to a statically linked library, or compiled as a dynamically shared object (DSO), similar to a shared library Static modules become part of the httpd binary and are automatically recognized by the Apache core DSOs each have a file on the file system and must be loaded by a LoadModule command in Apache s httpdconf file in order to be initialized The flow of operations is shown in Figure 22
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Apache flow of operations
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Phases
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Phases are one of the three critical components of the Apache API The Apache flow of operation goes through eight phases each time Apache receives a request to serve a Web page A request flows from Phase 1 to Phase 8 in sequential order When Apache receives a request for a document, it starts by passing it through Phase 1; by the time the request reaches Phase 8, the response has been sent and Apache waits for a new request The eight phases of Apache are illustrated in Figure 23
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Handlers
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A handler is a set of C functions that a module uses to perform a task Inside the code of each module is a structure identifying what type of processes it can perform, as well as the code to actually perform it; this is a handler Each module can have one or more handlers defined in it The handler is the part of the module that performs actions If a module is written to process CGI scripts, the module will have a structure telling Apache which handler function to call when it sees a request for a CGI
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Apache phases
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script Apache keeps a list of which handlers perform which functions and which modules are associated with each handler When each module is initialized, Apache looks at the module s handler structure(s) to determine what that module does These structures tell Apache each phase for which they are appropriate, as well as how to call the handler when needed Each handler has the option of declining the request or attempting to handle the request when called If the request is declined, Apache tries the next handler registered for that phase If the request returns a success, the next phase is attempted If it returns a failure, the request goes straight to the last phase: logging the request There are exceptions to this flow of operations For instance, when a handler returns a success after handling a request, the request moves to the next phase, except for the Non-authentication Access Checking, Fixup and Logging the Request phases In these phases, all handlers run as long as no failures are returned by previous handlers Apache handlers are shown in Figure 24
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Apache handler processing
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Phases in Detail
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To give you a better understanding of how Apache works, the next section will explain each of the eight phases in more detail
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Phase 1: URI to File Name Translation
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Requests come in with a URI, which is a subset of the URL that identifies the path to the Web page If you were to open the URL http://wwwlinuxcertificationcom/indexepl in a Web browser, the browser would connect to the host named wwwlinuxcertificationcom and send it the following request:
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