Yes, http.sys is an http server implemented in the Windows Kernel it’s the http server IIS and all other http based windows services use and has an API for 3rd

Yes, http.sys is an http server implemented in the Windows Kernel it’s the http server IIS and all other http based windows services use and has an API for 3rd party servers. https://docs.microsoft.com/en-us/iis/get-started/introduction-to-iis/introduction-to-iis-architecture#hypertext-transfer-protocol-stack-httpsys https://docs.microsoft.com/en-us/iis/get-started/introductio... The point being that there are advantages to implementing a kernel or hybrid mode HTTP server and Microsoft has done it on Windows some other implementations exist but other than MF/Big Unix I’ve never seen them in actual use. I don’t think there is much of a point of implementing an HTTP client library in the kernel tho since the performance should be an issue really on the client side.