问题
I have a grpc server proxied by grpc-gateway. When I make a HTTP call to the gateway endpoint, my corresponding grpc service method is called. Now, the grpc service implementation receives a Context which has the headers. I couldn't figure out how to access the headers.
When I debug my grpc service and put a breakpoint, this is the structure of the Context object which my service receives. Now, how can I get the value of any of the HTTP request headers?
回答1:
HTTP headers are stored in metadata.
md, ok := metadata.FromIncomingContext(ctx) should work for getting the incoming metadata.
来源：https://stackoverflow.com/questions/57686963/how-to-access-request-headers-in-grpc-service-proxied-by-grpc-gateway-in-golang