Apache HTTP Server Version 2.3
Available Languages: en
Description: | Filtering Input (request) and Output (response) content using sed commands |
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Status: | Experimental |
Module Identifier: | sed_module |
Source File: | mod_sed.c sed0.c sed1.c regexp.c regexp.h sed.h |
Compatibility: | Available in Apache 2.3 and later |
mod_sed is an in-process content filter. The mod_sed filter implements the sed edit commands implemented by the Solaris 10 sed program as described in the man page. However, unlike sed, mod_sed doesn't take data from standard input. Instead, the filter acts on the entity data sent between client and server. mod_sed can be used as an input or output filter. mod_sed is a content filter, which means that it cannot be used to modify client or server http headers.
The mod_sed output filter accepts a chunk of data, executes the sed scripts on the data, and generates the output which is passed to next filter in the filter chain.
The mod_sed input filter reads the data from the next filter in filter chain, executes the sed scripts, and returns the generated data to the caller filter in the filter chain.
Both the input and output filter only process the data if new line characters are seen in the content. At the end of the data, the rest of the data is treated as the last line.
A tutorial article on mod_sed, and why it is more powerful than simple string or regular expression search and replace, is available on the author's blog.
# In following example, the sed filter will change the string
# "monday" to "MON" and the string "sunday" to SUN in html document
# before sending to client.
<Directory "/var/www/docs/sed">
AddOutputFilter Sed html
OutputSed "s/monday/MON/g"
OutputSed "s/sunday/SUN/g"
</Directory>
# In following example, the sed filter will change the string
# "monday" to "MON" and the string "sunday" to SUN in the POST data
# sent to php
<Directory "/var/www/docs/sed">
AddInputFilter Sed php
InputSed "s/monday/MON/g"
InputSed "s/sunday/SUN/g"
</Directory>
Complete details of the sed command can be found from the sed man page.
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Available Languages: en