Github user bryancall commented on the issue:
https://github.com/apache/trafficserver/pull/1557
Added the requirements here:
```
Here are the requirements for supporting brotli encoding.
If the Accept-Encoding has brotli, then the normalize AE should pick up
brotli. (Should we send both "br" and "gzip" in AE?
If the response is already encoded then do nothing. Should we have a
configuration to force brotli encode the response?
If the response is unencoded and if Accept-Encoding has brotli then encode
using brotli.
```
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