CORS

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When accessing gRPC from a browser via HTTP transcoding or gRPC-Web, CORS headers may be required for the browser to allow access to the gRPC endpoint. Adding CORS headers can be done by using GRPC.Server.Interceptors.CORS as an interceptor in your GRPC.Endpoint module, configuring it as described in the module documentation:

Example:

# Define your endpoint
defmodule Helloworld.Endpoint do
  use GRPC.Endpoint

  intercept GRPC.Server.Interceptors.Logger
  intercept GRPC.Server.Interceptors.CORS, allow_origin: "mydomain.io"
  run Helloworld.Greeter.Server
end