Android: “Bad Request-Invalid Hostname” When accessing localhost from emulators

问题

I am not able to use localhost with xamarin.android application. I have executed Web project & Service project(not mobile app) on Chrome Browser.

The displayed port number I tried browsing in Android Studio emulators & Genymotion emulators by appending 10.0.2.2: & 10.0.3.2: respectively, I got result Bad Request-Invalid Hostname. Even I have tried Service project port number, both not working.

Web Project: ASP.NET project using Visual Studio 2017 & Having service project in the same solution.

回答1:

Open your solution folder. You might have several projects inside 1 folder, you don't need project's folder but the root one. Inside you'd have .vs/config/applicationhost.config file, open it.

find <sites> inside you'll have sites that you are running, might have several, if you switch startup projects in one solution. The name will be corresponding to one displayed by IIS in taskbar when you right-click it's icon. The tag could be, for example, <site name="ServerApp" id="2">. Now you need to add a line to bind external connections to your machine ip, for example

      <site name="ServerApp" id="2">
...
        <bindings>
...
          <binding protocol="http" bindingInformation="*:60424:127.0.0.1" />
        </bindings>
      </site>

Set appropriate port number and protocol, what matters here is just map them to 127.0.0.1, not "localhost" then they will be available for android emulator via 10.0.2.2:60424

回答2:

I have solved this issue from below answer. By using third party software ngrock.

How to use it.

来源：https://stackoverflow.com/questions/49270453/android-bad-request-invalid-hostname-when-accessing-localhost-from-emulators