Lighttpd

mod_deflate is a modified version of
mod_compress. mod_deflate can compress any output from lighttpd static or
dynamic. It doesn't support caching compressed output like mod_compress.

Module options: {{{
deflate.enabled = "enable"
deflate.compression-level = 9
deflate.mem-level = 9
deflate.window-size = 15
deflate.bzip2 = "enable"
deflate.min-compress-size = 200
#deflate.sync-flush = "enable"
#deflate.output-buffer-size = 8192
deflate.work-block-size = 512
deflate.mimetypes = ("text/html", "text/plain")
#deflate.debug = "enable"
}}}

The sync-flush option allows dynamic scripts to flush output to the browser
and still use compression.
work-block-size is the number of kilobytes to compress at one time, it allows
the webserver to do other work (network I/O) in between compression.
min-compress-size is the smallest response size that will be compressed.

output-buffer-size is a per connection buffer for compressed output, it can
help decrease the response size(fewer chunks to encode). If it is set to
zero or if sync-flush is enabled a shared buffer will be used.