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<title>Filters - Apache HTTP Server Version 2.4</title>
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<body id="manual-page">
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Modules | Directives | FAQ | Glossary | Sitemap
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Apache HTTP Server Version 2.4
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Apache > HTTP Server > Documentation > Version 2.4
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Available Languages: en |
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es |
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fr |
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ja |
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ko |
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This document describes the use of filters in Apache.
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 Smart Filtering
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Exposing Filters as an HTTP Service
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Using Filters
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See also
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The Filter Chain is available in Apache 2.0 and higher,
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and enables applications to process incoming and outgoing data
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in a highly flexible and configurable manner, regardless of
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where the data comes from. We can pre-process incoming data,
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and post-process outgoing data, at will. This is basically
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independent of the traditional request processing phases.
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Some examples of filtering in the standard Apache distribution are:
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mod_include, implements server-side includes.
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mod_ssl, implements SSL encryption (https).
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mod_deflate, implements compression/decompression on the fly.
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mod_charset_lite, transcodes between different character sets.
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mod_ext_filter, runs an external program as a filter.
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Apache also uses a number of filters internally to perform
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functions like chunking and byte-range handling.
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A wider range of applications are implemented by third-party filter
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modules available from modules.apache.org and
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elsewhere. A few of these are:
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HTML and XML processing and rewriting
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XSLT transforms and XIncludes
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XML Namespace support
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File Upload handling and decoding of HTML Forms
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Image processing
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Protection of vulnerable applications such as PHP scripts
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Text search-and-replace editing
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mod_filter, included in Apache 2.1 and later,
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enables the filter chain to be configured dynamically at run time.
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So for example you can set up a proxy to rewrite
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HTML with an HTML filter and JPEG images with a completely
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separate filter, despite the proxy having no prior information
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about what the origin server will send. This works by using a
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filter harness, that dispatches to different providers according
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to the actual contents at runtime. Any filter may be either
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inserted directly in the chain and run unconditionally, or
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used as a provider and inserted dynamically. For example,
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an HTML processing filter will only run if the content is
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text/html or application/xhtml+xml
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A compression filter will only run if the input is a
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compressible type and not already compressed
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A charset conversion filter will be inserted if a text
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document is not already in the desired charset
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Filters can be used to process content originating from the client in
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addition to processing content originating on the server using the
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mod_reflector module.
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mod_reflector accepts POST requests from clients, and reflects
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the content request body received within the POST request back in the response,
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passing through the output filter stack on the way back to the client.
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This technique can be used as an alternative to a web service running within
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an application server stack, where an output filter provides the transformation
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required on the request body. For example, the mod_deflate
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module might be used to provide a general compression service, or an image
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transformation filter might be turned into an image transformation service.
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There are two ways to use filtering: Simple and Dynamic.
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In general, you should use one or the other; mixing them can
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have unexpected consequences (although simple Input filtering
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can be mixed freely with either simple or dynamic Output filtering).
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The Simple Way is the only way to configure input filters, and is
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sufficient for output filters where you need a static filter chain.
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Relevant directives are
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SetInputFilter,
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SetOutputFilter,
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AddInputFilter,
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AddOutputFilter,
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RemoveInputFilter, and
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RemoveOutputFilter.
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The Dynamic Way enables both static and flexible, dynamic configuration
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of output filters, as discussed in the mod_filter page.
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Relevant directives are
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FilterChain,
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FilterDeclare, and
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FilterProvider.
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One further directive AddOutputFilterByType is still supported,
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but deprecated. Use dynamic configuration instead.
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Available Languages: en |
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es |
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fr |
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ja |
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ko |
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Notice:This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our mailing lists.
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