Page Speed: Specify a Vary: Accept-Encoding header

Bugs in some public proxies may lead to compressed versions of your resources being served to users that don't support compression. Specifying the Vary: Accept-Encoding header instructs the proxy to store both a compressed and uncompressed version of the resource.

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Page Speed

Avoid bad requests
Avoid CSS expressions
Combine external CSS
Combine external JavaScript
Defer loading of JavaScript
Enable gzip compression
Leverage browser caching
Leverage proxy caching
Minify CSS
Minify HTML
Minify JavaScript
Minimize cookie size
Minimize DNS lookups
Minimize redirects
Minimize request size
Optimize images
Optimize the order of styles and scripts
Parallelize downloads across hostnames
Put CSS in the document head
Remove query strings from static resources
Remove unused CSS
Serve resources from a consistent URL
Serve scaled images
Serve static content from a cookieless domain
Specify a cache validator
Specify a character set early
Specify a Vary: Accept-Encoding header
Specify image dimensions
Use efficient CSS selectors