package envoy.extensions.filters.http.grpc_http1_reverse_bridge.v3

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gRPC reverse bridge filter configuration

• string content_type = 1

  The content-type to pass to the upstream when the gRPC bridge filter is applied. The filter will also validate that the upstream responds with the same content type.

• bool withhold_grpc_frames = 2

  If true, Envoy will assume that the upstream doesn't understand gRPC frames and strip the gRPC frame from the request, and add it back in to the response. This will hide the gRPC semantics from the upstream, allowing it to receive and respond with a simple binary encoded protobuf. In order to calculate the ``Content-Length`` header value, Envoy will buffer the upstream response unless :ref:`response_size_header <envoy_v3_api_field_extensions.filters.http.grpc_http1_reverse_bridge.v3.FilterConfig.response_size_header>` is set, in which case Envoy will use the value of an upstream header to calculate the content length.

• string response_size_header = 3

  When :ref:`withhold_grpc_frames <envoy_v3_api_field_extensions.filters.http.grpc_http1_reverse_bridge.v3.FilterConfig.withhold_grpc_frames>` is true, this option controls how Envoy calculates the ``Content-Length``. When ``response_size_header`` is empty, Envoy will buffer the upstream response to calculate its size. When ``response_size_header`` is set to a non-empty string, Envoy will stream the response to the downstream and it will use the value of the response header with this name to set the ``Content-Length`` header and gRPC frame size. If the header with this name is repeated, only the first value will be used. Envoy will treat the upstream response as an error if this option is specified and the header is missing or if the value does not match the actual response body size.

gRPC reverse bridge filter configuration per virtualhost/route/weighted-cluster level.

• bool disabled = 1

  If true, disables gRPC reverse bridge filter for this particular vhost or route. If disabled is specified in multiple per-filter-configs, the most specific one will be used.