Is there any method to bind localhost + port to custom hostname

Question

I just tried to set up a reverse proxy in blazor web server application with YARP. When I built it, it runs on localhost:5278. I just want to change adress with something else like www.mybeautifultestsite.com. Editing the hosts file does not enable me to bind to http:://www.mybeautifultestsite.com on the 5278 port. I still need to use http:://www.mybeautifultestsite.com:5278 to reach it. Is there any method for this? Here my appsettings.json file. Thanks in advance.

"ReverseProxy": {
 "Routes": {
  "api-route": {
    "ClusterId": "api-cluster",
    "Match": {
      "Host": "www.mybeautifultestsite.com",
      "Path": "{**catch-all}"
    }
  }
},
"Clusters": {
  "api-cluster": {
    "Destinations": {
      "api-destination": {
        "Address": "http://127.0.0.1:5278"
      }
    }
  }
}

} }

Answer 1

By default Kestrel will listen on a random port between 5000-5300 (7000-7300 for HTTPS).

In addition to adding the hostname to the hosts file you need to instruct Kestrel to listen on port 80. Something like this:

{
  // Kestrel
  "AllowedHosts": "*",
  "Kestrel": {
    "Endpoints": {
      "Http": {
        "Url": "http://[::]:80",
        "Protocols": "Http1AndHttp2"
      },
    }
  },

  // YARP
  "ReverseProxy": {
    "Routes": {
      "api-route": {
        "ClusterId": "api-cluster",
          "Match": {
            "Host": "www.mybeautifultestsite.com",
            "Path": "{**catch-all}"
          }
        }
      }
    },
    "Clusters": {
      "api-cluster": {
        "Destinations": {
          "api-destination": {
            "Address": "http://127.0.0.1:5278"
          }
        }
      }
    }
  }
}

Disclaimer: Not tested