Compress text responses using Brotli or gzip compression,
based on the client's Accept-Encoding header.
Values:
UNDEFINED_COMPRESSION_MODE (0):
A value indicating that the enum field is not
set.
AUTOMATIC (165298699):
Automatically uses the best compression based
on the Accept-Encoding header sent by the
client.
DISABLED (516696700):
Disables compression. Existing compressed
responses cached by Cloud CDN will not be served
to clients.