[bp/1.29] http: keep trailers
TE header instead of removing it (#32255)
#33018
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Official grpc library does not allow empty TE header. This causes an issue when proxying requests through Envoy which currently deletes the TE header since #30535.
I (@quantumsheep ) opened a related MR on the grpc library to allow this header to be empty as the HTTP/2 RFC allows it but it might cause issues with other libraries.
Risk Level: medium (behavioral change)
Testing: modified an existing test
Docs Changes: n/a
Release Notes: inline
Platform Specific Features:
Runtime guard: keep the previous one
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Testing:
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