If I try calling the SendSimpleResponse without a body but with some length then the client hangs due to the Keep-Alive header which instructs the client the wait for data that will never come.

This doesn't sound right. The Keep-Alive header simply hints that the client can reuse the TCP connection for further requests. It shouldn't affect whether the client hangs around

Looks like you're using -X HEAD instead of -I. There's special client logic for HEAD responses in HTTP (to precisely avoid waiting); that's only triggered in curl if you use the -I option.

Sounds like if you try SendSimpleResponse with -I on the curl command line it might get the desired result?

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