Narrow GrpcWebMiddleware rules to only rewrite POST requests #1618
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User reporting an issue when combing gRPC-Web with CORS - dotnet/AspNetCore.Docs#25046
I'm not sure how they interfere with each other. gRPC-Web middleware should only trigger when content-type = "application/grpc-web".
My only theory is content-type is incorrectly being set on OPTIONS preflight request. This PR updates middleware to only modify the request when it a POST (all gRPC requests are POST)