Enable brotli compression to be forced #375
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mod_deflate's force-gzip by adding support for a force-brotli environment variable
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Copy the mechanism used in the mod_deflate module to allow compression to be forced by using an environment variable named force-brotli.
An example use case:
Our reverse proxy needs to run the SUBSTITUTE filter on pages returned from a 3rd party app server. We strip out the Accept-Encoding header before proxying the request to the 3rd party, but that prevents brotli from running after we've run SUBSTITUTE. By adding this environment variable check, we can check the Accept-Encoding header using mod_rewrite, set the force-brotli environment variable if appropriate, unset the Accept-Encoding header to get raw content from 3rd party server, while still sending compressed data to the client, thus saving large amounts of bandwidth.