Fix hostname support

[DerEnderKeks]

This PR is split from #861

A device will otherwise block the request, when requesting with a hostname instead of the plain IP.

[emontnemery]

Please better explain what this is intended to fix, I can't reproduce any case where this is blocked myself.

Maybe paste some examples using curl to craft the working and non-working requests?
Are you sure the problem you see is not caused by an issue in your network configuration?

[DerEnderKeks]

When requesting the /setup/eureka_info endpoint using a hostname (instead of a plain IP), the request is blocked. I can reproduce this both with an Nvidia Shield and a Google Home Mini. I doubt my network influences this, as the devices are on the same L2 and L3 network and can communicate directly. Here are some simple curl commands for reproduction:

Working

$ curl https://x.x.x.x:8443/setup/eureka_info -k -v
*   Trying x.x.x.x:8443...
* Connected to x.x.x.x (x.x.x.x) port 8443
* schannel: disabled automatic use of client certificate
* schannel: using IP address, SNI is not supported by OS.
* ALPN: curl offers http/1.1
* ALPN: server did not agree on a protocol. Uses default.
* using HTTP/1.x
> GET /setup/eureka_info HTTP/1.1
> Host: x.x.x.x:8443
> User-Agent: curl/8.4.0
> Accept: */*
>
< HTTP/1.1 200 OK
< Access-Control-Allow-Headers:Content-Type
< Cache-Control:no-cache
< Content-Length:1274
< Content-Type:application/json
<
{...json...}* Connection #0 to host x.x.x.x left intact

$ curl -H 'Host:' https://homeminitest:8443/setup/eureka_info -k -v
*   Trying x.x.x.x:8443...
* Connected to homeminitest (x.x.x.x) port 8443
* schannel: disabled automatic use of client certificate
* ALPN: curl offers http/1.1
* ALPN: server did not agree on a protocol. Uses default.
* using HTTP/1.x
> GET /setup/eureka_info HTTP/1.1
> User-Agent: curl/8.4.0
> Accept: */*
>
< HTTP/1.1 200 OK
< Access-Control-Allow-Headers:Content-Type
< Cache-Control:no-cache
< Content-Length:1274
< Content-Type:application/json
<
{...json...}* Connection #0 to host homeminitest left intact

Blocked

$ curl https://homeminitest:8443/setup/eureka_info -k -v
*   Trying x.x.x.x:8443...
* Connected to homeminitest (x.x.x.x) port 8443
* schannel: disabled automatic use of client certificate
* ALPN: curl offers http/1.1
* ALPN: server did not agree on a protocol. Uses default.
* using HTTP/1.x
> GET /setup/eureka_info HTTP/1.1
> Host: homeminitest:8443
> User-Agent: curl/8.4.0
> Accept: */*
>
< HTTP/1.1 403 Forbidden
< Content-Length:0
<
* Connection #0 to host homeminitest left intact