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Lifecycle of Apache Servers A recent survey revealed that Apache web servers power 56 percent of all web sites. Although known for robustness, performance, and security, one reason for this remarkable success is a modular architecture that enables easy extension with optional functionality, third party add-ons, and custom modifications.
So how do you go about writing an Apache module? There are, of course, numerous freely available third-party modules; http: Although compiling into Apache can provide a small performance boost, there are advantages to working with shared objects.
For instance, a rapid compile-debug cycle benefits from the shared-object approach. Moreover, it is generally easier to deploy and maintain versions when the modules are distinct objects on disk. The full module is contained in this file, although I can link in as many additional libraries as I like.
A module is simply a library of callback functions. The heart of the library is the struct of type module see Example 1which Apache uses to register the callback functions. The name of the module struct is not arbitrary. For Apache to load the module, configuration directives are inserted into the config file like this: The LoadModule directive provides Apache with the name of the struct and the location of the shared object on disk.
Command Processing In the lifecycle of an Apache process for more lifecycle information, see the accompanying text box entitled "Lifecycle of Apache Servers"the first calls to the module come from configuration directives, if Apache encounters any while digesting httpd.
Since I want to be able to configure the greeting from the Apache config file, I need to register code to act on config directives. The fourth element specifies how this configuration directive is to be used.
I am going with the simplest: The fifth element specifies how many arguments will be processed by the directive. In this case, I am only passing in one. Again, options exist here, from taking the unparsed line to iterating over a list of parameters.
The final parameter is a descriptive string used for error reporting. Were the config file misconfigured, Apache would error and abort on startup. If, in processing the command, you hit an unrecoverable error, you could return a string instead of NULL, again causing an abort.
Since Apache acts on config files top to bottom, this directive must be inserted after the LoadModule directive. Module Initialization Once Apache has processed all config files, each module is initialized.Current Apache HTTP Server Project Members¶.
This page exists to recognize the efforts and contributions of the core individuals in the Apache HTTP Server Project. Linux Apache Web Server Administration, Second Edition (Craig Hunt Linux Library) [Charles Aulds] on yunusemremert.com *FREE* shipping on qualifying offers.
Authoratative Answers to All Your Apache Questions--Now Updated to Cover Apache Linux Apache Web Server Administration is . This book will show you how to write Apache modules. Because you can get so much done with Perl modules, the focus of the book is on the Apache API through the eyes of the Perl.
Apache relies on return values from handlers to signify whether a request was handled or not, and if so, whether the request went well or not. If a module is not interested in handling a specific request, it should always return the value DECLINED.
Apache 2: Featured Articles. In this section we highlight some of the articles on the web that are of interest to Apache 2 users.
In Ryan Bloom's swan song for the Apache Basics series, he talks about one of the least publicised new features in Apache which is allowing one module to call into another module to execute an operation. In Apache , for two modules to execute the same. Configuring Apache to permit CGI.
In order to get your CGI programs to work properly, you'll need to have Apache configured to permit CGI execution.