Description:

mod_sed is an in-process content filter. The mod_sed filter implements
the sed editing commands implemented by the Solaris 10 sed program as
described in the manual 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 the
next filter in the chain.

The mod_sed input filter reads the data from the next filter in the
chain, executes the sed scripts, and returns the generated data to the
caller filter in the filter chain.