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Grpc doesn't work over the browser. This is stated explicitly in the FAQ.

See https://groups.google.com/forum/#!topic/grpc-io/5Ic8MKgltwY

It's rather painful that they don't seem to have any design docs up for their HTTP transport, leaving it to things like FAQ entries to explain these details. This was my first thought too- grpc does this.

The protocol is documented - https://github.com/grpc/grpc-common/blob/master/PROTOCOL-HTT...

However, you still need the FAQ to figure out that browser transport isn't supported

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