explicitly set hostname at the proxy server

[spaparaju]

At ReverseProxy, HTTP Header value for Host is not set properly (instead contains the hostname of the token-refresher).
With this problem, The local tests would pass as both the source and host to proxy are both 'localhost'.
This problem can be reproduced when the host to proxy to is different from the the host the token-refresher runs.
This fix require explicitly setting the hostname as part of HttpRequest at the ReverseProxy.

Checkout reference to this problem here

[squat]

the NewSIngleHostReverseProxy function only creates a director function and returns a ReverseProxy struct, so calling the function and then overriding the director with a new one is funny because it's the same as not calling the function.

Better would be to return a ReverseProxy{Director: func(){//scome code here}}

[spaparaju]

Makes sense. Switched to directly creating ReverseProxy.

[squat]

great 🚀