Using nginx to check Accept header

[Kai Hendry]

I noticed https://groups.google.com/a/webmproject.org/forum/#!msg/webp-discuss/GWrE6nBWiNg/JUlnMmmy6UIJ for Apache.

Are there any nginx users out there?

And for the cherry on top, has anyone using dwebp on the fly for browsers that don't support Webp? When I decompress a simple WebP graphics I get a 2M PNG result which is a bit unusable. Wondering if people have good tips for this.

We use WEBP upon http://cam.hackerspace.sg

Thanks,

[James Zern]

On Tuesday, August 27, 2013 12:39:47 AM UTC-7, Kai Hendry wrote:

I noticed https://groups.google.com/a/webmproject.org/forum/#!msg/webp-discuss/GWrE6nBWiNg/JUlnMmmy6UIJ for Apache.

Are there any nginx users out there?

There was a write-up about using the accept-header with nginx recently [1], maybe it's useful.

 

And for the cherry on top, has anyone using dwebp on the fly for browsers that don't support Webp? When I decompress a simple WebP graphics I get a 2M PNG result which is a bit unusable. Wondering if people have good tips for this.

There were a few recent changes which added writing the decoded output to stdout. So using this workflow you could now send that on for further processing:

$ dwebp input.webp -o - | convert - output.jpeg

 

We use WEBP upon http://cam.hackerspace.sg

Thanks,

[1] http://www.igvita.com/2013/05/01/deploying-webp-via-accept-content-negotiation/ 

[Kai Hendry]

On 29 August 2013 04:05, James Zern <jz...@google.com> wrote:
> There were a few recent changes which added writing the decoded output to
> stdout. So using this workflow you could now send that on for further
> processing:
> $ dwebp input.webp -o - | convert - output.jpeg

Oh I think I see the change:
http://git.chromium.org/gitweb/?p=webm/libwebp.git;a=commit;h=61405a143d1af15b5d844b19c9c4e24d8fc3891c

I'm using 0.3.1-3 of libwebp on Archlinux. `dwebp` seems unable to
print a version identifier sadly.

Will look into building from source.

Thanks!

[Pascal Massimino]

Hi Kai,

 you can use 'dwebp -version' 

Will look into building from source.

Yes, this patch hasn't made it to any official release yet.

Thanks!

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[Kai Hendry]

On 29 August 2013 09:00, Pascal Massimino <pascal.m...@gmail.com> wrote:
> you can use 'dwebp -version'

Oh I should have looked at the man page instead of the stdout help.
`-v` being useless confused me. :-)

[Kai Hendry]

An nginx configuration with:

if ($http_accept !~* "webp") {
rewrite ^/(.*\.webp)$ /webp2jpg.php?f=$1 last; break;
}


And webp2jpg.php looking like:

<?php
header("Content-Type: image/jpeg");
$webp = $_REQUEST["f"];
if (file_exists($webp)) {
system("dwebp " . escapeshellarg($webp) . " -o - | convert - jpg:-");
} else {
echo "$webp did not exist";
}
?>


Seems to do the trick!