WebP issue in 1.10.33.0

[Jeff Kaufman]

We've had reports that 1.10.33.0 is sending WebPs images to browsers
that don't support it. We're working on fixing this, and in the mean
time we recommend people either hold off on upgrading or temporarily
disable WebP conversion. To do this, add to your configuration:

# Temporarily disable webp filters. This block can be removed after
# upgrading to 1.10.33.1 or later.
ModPagespeedDisableFilters convert_jpeg_to_webp;
ModPagespeedDisableFilters convert_to_webp_lossless;
ModPagespeedDisableFilters convert_to_webp_animated;

On Mon, Dec 14, 2015 at 2:26 PM, Jeff Kaufman <jef...@google.com> wrote:
> Release 1.10.33.0-beta
>
> The first release of mod_pagespeed 1.10 is now available for download as a
> beta release. With this release we have several high-impact features to
> share. We're most excited about Responsive Image Support, which delivers
> high resolution images to high pixel-density screens by automatically
> generating html5srcset attributes for images. Other big changes include
> Caching Gzip Output, which lets us run gzip at the most agressive encoding
> level, Remote Config, which lets you load additional configuration over the
> network, and converting Animated GIF to WebP, which reduces file size by
> 35%.
>
> Installation Instructions
>
> If you are currently on the beta channel, you can update as usual:
>
> If you installed the .rpm package, you can update with:
>
> sudo yum update mod-pagespeed-beta
> sudo /etc/init.d/httpd restart
>
> If you installed the .deb package, you can update with:
>
> sudo apt-get update
> sudo apt-get upgrade
> sudo /etc/init.d/apache2 restart
>
> If you are currently on the stable channel and would like to switch to the
> beta channel, first uninstall mod_pagespeed and install the beta package
> from:
>
> https://developers.google.com/speed/pagespeed/module/download
>
> Instructions for building from source are available at:
>
> https://developers.google.com/speed/pagespeed/module/build_mod_pagespeed_from_source
>
> New Automatically Enabled Features
>
> Cache Gzip OutputCompress rewritten resources at the highest compression
> setting and store them compressed in cache.Insert Universal AnalyticsIf
> enabled, the Insert Google Analytics filter will now insert Universal
> Analytics (analytics.js) instead of the legacy ga.js. This should have no
> impact on reporting, and gives you access to the benefits of Universal
> Analytics.Fetch resources over HTTPSHTTPS fetching is now enabled in the
> default configuration.Switch to new JS MinifierThe JavaScript minifier
> introduced in 1.8 is now the default.Add PageSpeedNoop Query ParameterAdd
> query parameter for cache busting.HTML5-compliant attribute namesHTML5
> requires all custom attributes to be prefixed with data-, and with this
> release PageSpeed generatesdata-pagespeed-foo attributes. Old-style
> pagespeed_foo attributes are still accepted.
>
> New Opt-In Features
>
> Remote ConfigurationFetch additional configuration directives over
> HTTPS.Responsive Image SupportMake images responsive by adding srcset
> attributes for different pixel densities.Animated WebPConvert animated GIF
> to animated WebP for browsers that can render it.Make showads.js
> AsynchronousConvert the blocking showads.js snippet into the asynchronous
> adsbygoogle.js snippet.HTTP/2-specific configuration in ngx_pagespeedAllow
> configuring filters and sharding differently depending on whether the
> browser connection is HTTP/2.Request-specific downstream caching
> configurationAllow script variables in the downstream caching configuration.
> (Nginx only)Content ExperimentsAllow PageSpeed experiments to log data to a
> Google Analytics Content Experiment.
>
> Issues Resolved
>
> Issues Affecting both Nginx and Apache
>
> Issue 931 Do not serve source map on hash mismatch.
> Issue 979 Allow spaces between filter names in PageSpeedFilters header.
> Issue 1085 Don't update Last-Modified when cache-extending.
> Issue 1092 Parsing complex CSS can fail, leaving cache in an inconsistent
> state.
> Issue 1109 Can't set MessageBufferSize to 0.
> Issue 1116 Support gcc 4.6.3 when building from source.
> Issue 1131 When building from source, respect the CXX variable.
> Issue 1149 WebP transcoding doesn't work with MapProxyDomain+IPRO.
> Issue 1150 BoringSSL won't compile under gcc5.
> Issue 1154 Spin in serf.
> Issue 1160 Don't serve WebP to Firefox on Android
> Issue 1164 Do not abbreviate 0s in CSS files as 0.
> Issue 1173 Disallow should apply to defer_javascript.
> Issue 1182 Don't try to resize images with invalid desired dimensions.
> Issue 1183 Race condition in the shared memory cache between delete and
> write.
> Issue 1184 Include canonical links for images and pdfs we rewrite.
> Issue 1185 Improve CSS parser's handling of new constructs.
> Issue 1186 Remove /wp-admin from our url blacklist.
> Issue 1187 Prioritize Critical CSS writes a mixture of optimized and
> unoptimized content.
> Issue 1188 Location headers not rewritten when proxying redirects.
> Issue 1189 Race in FileCache.
> Issue 1193 File reading tracks line numbers.
> Issue 1202 Improve resource usage for on-the-fly optimizations.
> Issue 1203 File cache entries are read in 10k chunks.
>
> Apache-specific Issues
>
> Issue 1077 Purging fails if the top-level configuration has PageSpeed as
> off.
> Issue 1088 Allow server owners to block access to handlers such that they
> can't be re-enabled in.htccess.
> Issue 1179 Compilation issue in ApacheFetch under 32-bit.
> Issue 1191 IPRO recorder crashes on corrupt brigades with multiple EOS
> buckets.

[Jeff Kaufman]

Release 1.10.33.1 is out, which fixes this issue. The workaround
below is no longer necessary if you've upgraded.