fastpi: return error responses formatted for the connectrpc protocol #77
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This PR changes the FastAPI adapter to return error responses in the format expected by the Connect protocol (see https://connectrpc.com/docs/protocol/#error-end-stream).
All errors will now be reported as a http response with a non-200 status code, and a JSON body with this shape:
Two status codes are now reserved to indicate issues with http request signatures:
ValueError
raised when the signature uses an unsupported hashing algorithm or when it didn't contain all the expected attributes (these should never occur when connected to the Dispatch platform)