View Source GRPC.Server.Interceptors.CORS (grpc v0.11.2)

Sends CORS headers when the client is using RPC via Web transcoding or gRPC-web.

Options

• :allow_origin - Required. A string containing the allowed origin, or a function capture (e.g. &MyApp.MyModule.function/2)) which takes a req and a stream and returns a string.
• :allow_headers - A string containing the allowed headers, or a function capture (e.g. &MyApp.MyModule.function/2)) which takes a req and a stream and returns a string. Defaults to nil. If defined as nil, the value of the "access-control-request-headers" request header from the client will be used in the response.

Usage

defmodule Your.Endpoint do
  use GRPC.Endpoint

  intercept GRPC.Server.Interceptors.CORS
end

defmodule Your.Endpoint do
  use GRPC.Endpoint

  intercept GRPC.Server.Interceptors.CORS, allow_origin: "some.origin"
end


defmodule Your.Endpoint do
  use GRPC.Endpoint

  def allow_origin(req, stream), do: "calculated.origin"
  intercept GRPC.Server.Interceptors.CORS, allow: &Your.Endpoint.allow_origin/2
end