commit 0a11c0431f0f4c1585db1407b043b75cee881bc3
author Maxim Dounin <mdounin@mdounin.ru> Sat Mar 17 23:04:25 2018 +0300
committer Maxim Dounin <mdounin@mdounin.ru> Sat Mar 17 23:04:25 2018 +0300
tree 0ac81283fdacc0546598b4f47eae3bd99adfe82c
parent 5b27dea29a934b27c5ddec3d8bf08f466ed729de

gRPC: special handling of the TE request header.

According to the gRPC protocol specification, the "TE" header is used
to detect incompatible proxies, and at least grpc-c server rejects
requests without "TE: trailers".

To preserve the logic, we have to pass "TE: trailers" to the backend if
and only if the original request contains "trailers" in the "TE" header.
Note that no other TE values are allowed in HTTP/2, so we have to remove
anything else.