Connection Close Behavior on HTTP1.0 Requests #56223
Description
Is there an existing issue for this?
- I have searched the existing issues
Describe the bug
if (requestVersion <= Constants.V1_0 // Http.Sys does not support "Keep-Alive: true" or "Connection: Keep-Alive"
The comment in the code indicates http.sys does not support "Connection: Keep-Alive". However, we certainly see that header got to work in IIS, so the comment might be wrong. Thus, we want to change the behavior so that it aligns with IIS.
The reason we want to change this behavior on the server-side is that we don't want to keep closing connections on every request for http1.0, that will increase TLS costs on our end for subsequent re-connects. Given http1.0 traffic is not trivial amount.
Expected Behavior
If the request is http1.0 AND the request contains "Connection: keep-alive", we also send the "Connection: keep-alive" header in the response.
Steps To Reproduce
Send http 1.0 request using curl to ASP.NET endpoint with "Connection: keep-alive" header
curl.exe --http1.0 -i <ASP.NET endpoint uri> -H "Connection: keep-alive"
From the response, you'll see the "Connection: close" header.
Exceptions (if any)
No response
.NET Version
6.0.131
Anything else?
No response