Suggest allowing use of WebP and Brotli to lighten loads on servers/client that support it.

[DamonHD]

Pitch

Integrating support for the now-well-tested WebP image format (Accept: image/webp) and Brotli compression (Accept-Encoding: br) would reduce bandwidth demands significantly, eg during a preview stampede.

Motivation

Save bandwidth all round (and reduce climate change)!

[renchap]

Duplicate of #20896 for webp support (which would probably require a huge refactor of our media pipeline)

For Brotli compression, we already compress the assets using Brotli. It is up to the server admin to configure their webserver to serve those properly. For dynamic Brotli compression of the dynamic pages, same, this is up to the server admin to configure their webserver/proxy to compress on the fly, but this might not be a good idea as Brotli might have significant overhead.

[DamonHD]

I don't believe that you are accepting Brotli compressed HTML pages from servers that offer them: not from my server for example. My relevant HTML pages are precompressed with zopfli and Brotli but you appear not to accept-encoding br, only gzip.