Do not set up Host header for CNAME #560
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Issue with Kerberos authentication in HTTP requests. Specifically, the issue occurred when the SPN (Service Principal Name) was being retrieved and the Host header in the HTTP request was being set to the final resolved host name from the URL.
This causes problems when working with proxies that must authenticate the client and then redirect clients. It is not clear why this was done in the original code. Without setting this header, everything starts working.
Example
service1.example.com-> proxy.example.com -> <target server>
In this case, the proxy service uses a single account with all SPNs for all services after it (e.g., HTTP/service1.example.com and HTTP/proxy.example.com). Therefore, everything works when the client retrieves any SPN. However, the Host header in the request was also changed, which caused the proxy to not understand which service to redirect the request to.