gRPC C++: Limited options for displaying headers in logs, GRPC_TRACE=api is too verbose

[eliekozah]

The GRPC_TRACE environment variable is used to enable detailed logging for various gRPC components. While GRPC_TRACE=api successfully displays request and response headers in the output, using other combinations, such as GRPC_TRACE=http, does not show these headers. GRPC_TRACE=api, while displaying headers, results in an extremely verbose output (thousands of lines) regardless of the GRPC_VERBOSITY level (INFO or DEBUG).

Proposed solution:
Implement a lightweight interceptor mechanism in the gRPC C++ SDK that customers can utilize. This interceptor would allow users to capture and view request and response headers without enabling overly verbose logging.