Forum Discussion
Filip_Mikulík_1
Cirrus
In HTTP v 1.1 is Host header mandatory. It is used for resolution destination web server (like the virtual host on apache, or server behind a reverse proxy,...).
cwkim_261931
Jul 31, 2018Nimbostratus
I found this article.
Note: HTTP/1.1 requires the Host header to be present in the request but does not require the header to contain a value. If you do not have a specific host name on your server, a value of Host: suffices in most cases. A null value is valid unless the HTTP server requires them for virtual hosting.
(https://support.f5.com/csp/article/K3224)
So, I want to know the reason of different result by using HOST and NULL HOST.