October 2008
Intermediate to advanced
204 pages
3h 2m
English
Content preview from Apache 2 Pocket Reference
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Chapter 7. Filters
Filters are a mechanism introduced in Apache 2.0 to preprocess client POST data before it is seen by the content handler, and to postprocess the output from the handler before it is sent back to the client. Filters can be chained and can modify the metainformation as well as the data itself. They can be used explicitly and are also used internally by Apache, for example, for implementing SSL encryption. Table 7-1 lists the filters provided by standard Apache modules.
Table 7-1. Standard built-in filters
Filter name | Module | Description |
| mod_deflate | Output compression |
| mod_deflate | Input uncompression |
| mod_include | SSI processing |
| mod_substitute | Response body substitutions |
Simple Filter Configuration
Filters can be configured statically in mod_mime, which may be appropriate if the filtering requirements for a resource always remain the same.
AddInputFilter
SVDH* (FileInfo)
mod_mime (B)
OFF
AddInputFilter filter[;filter ...] ext ...
Compatibility: 2.0.26 and later
Maps each of the extensions to the input filter specified in the semicolon-separated filter list.
AddOutputFilter
SVDH* (FileInfo)
mod_mime (B)
OFF
AddOutputFilter filter[;filter ...] ext ...
Compatibility: 2.0.26 and later
Maps each of the extensions to the output filter specified in the semicolon-separated filter list.
RemoveInputFilter
VDH* (FileInfo)
mod_mime (B)
RemoveInputFilter ext ...
Compatibility: 2.0.26 and later
Removes any input filter associations for files with the specified extensions.
RemoveOutputFilter ...
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