Compressed page streams detection and optimization

Hello,

I have a website serving a number of different PHP based applications.
Some of them natively serve their own gzipped pages, others only serve
compressed HTML but uncompressed .css and .js files, others don’t
compress
anything.

So far I have a per /location/ Nginx gzip configuration. Gzip is
globally
disabled and is explicitly enabled per location.
The apps I need or want to be compressed by Nginx simply have this:

location /blah/ {
include my_gzip_custom.conf
}

That conf file works great for all but one web app that serves a weird
mix
of compressed and uncompressed pages / related files.
What happens if Nginx gets served by PHP-FPM a compressed page and maybe
1
compressed .css file + 5 uncompressed .css files and 6 .js?
Does it “spend time and resources” re-compressing the already compressed
streams?
Does it wrap the gzipped compressed streams inside its own compressed
streams? (I admit my ignorance about if nested compressed streams are
even
supported by web standards).

Or does it - hopefully - detect an incoming stream “magic numbers” or
headers and transparently skips re-compression / wrapping?
That is, may I get an efficient output where Nginx only compresses the
specific page-included files (.css etc) that required it and
passes-through
the already compressed contents?

If not, is it possible to implement such a mechanism by means of
configuration and how?

Thanks in advance.

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,242802,242802#msg-242802

Hello!

On Thu, Sep 12, 2013 at 06:07:05AM -0400, dfumagalli wrote:

[…]

What happens if Nginx gets served by PHP-FPM a compressed page and maybe 1
compressed .css file + 5 uncompressed .css files and 6 .js?

[…]

Or does it - hopefully - detect an incoming stream “magic numbers” or
headers and transparently skips re-compression / wrapping?

Yes, it checks if a response is already compressed based on the
Content-Encoding header, and only compresses the response if it’s
not. It’s usually enough to just configure/enable gzip at http{}
or server{} level.


Maxim D.
http://nginx.org/en/donation.html

Thank you very much!

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,242802,242813#msg-242813

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