X-Thrift-Protocol:

[1] Buck: HTTP Cache API ( (2017-03-28 18:39:38 +09:00)) <https://buckbuild.com/concept/http_cache_api.html>

X-Thrift-Protocol compact, binary, json, simple_json
The X-Thrift-Protocol is intended to specify the thrift protocol used to serialize the Thrift Metadata Section of the body.