Is the gRPC Web filter supposed to deal with "application/grpc-web+json" requests?

[Diego Marangoni]

I have a a frontend client using connect-web to request to a backend behind envoy proxy, when I set the frontend to use binary format (application/grpc-web+proto) it works just fine, but when I disable the binary format (to use application/grpc-web+json) then it fails with this message:

invalid gRPC request content-type "application/grpc-web+json"

So, I wondering if envoy gRPC Web is even supposed to handle json encoding or if I doing something wrong.

My envoy config is attached here, just in case I'm doing something wrong

[Yan Avlasov]

These are the content types this extension understands: https://github.com/envoyproxy/envoy/blob/6c6f6200b7d3236ea1de96dfcf7ac78b81d1452f/source/extensions/filters/http/grpc_web/grpc_web_filter.cc#L61

JSON is not one of them.

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