Bad Request- Invalid Hostname while connect to localhost via wifi from mobile phone

Step 1: Add Inbound Rule of Windows Firewall

1. Open the Windows Firewall with Advanced Security.
   
2. At the left panel, right click on Inbound Rule > New Rule
   
3. Rule Type: Port
   Protocol and Ports: TCP
   Specific local ports: 57976
   Action: Allow the connection
   Profile: Tick all (Domain, Private, Public)
   Name: Name, Description(optional)
   
4. Finish.
   
   

Step 2: IIS or IIS Express

Add Bindings of IIS Manager

1. Open the IIS Manager.
   
2. At the left panel, Go to Sites > Default Web Sites.
   
3. At the right panel, click on the Bindings. Then, the new dialog pop ups.
   
4. At the pop-up dialog, click on the "Add" buttons. Input the port number and the hostname.
   For my case,
   port = 57976;
   hostname = 192.XXX.XXX.XXX (my IP address)
   
   

Add Bindings of IIS Express (Visual Studio)

1. Stop the current Site
   
2. For Visual Studio 2015, change the IIS config under your project folder C:\Projects\<ProjectName>\.vs\config\applicationhost.config‌​.
3. For previous version of Visual Studio 2015, change the IIS config under IIS Express folder C:\Users\<your profile name>\Documents\IISExpress\config\applicationhost.config
   

4. In applicationhost.config, search by the port number (for my case is 57976), then one more binding with your IP Address
   

       <site name="Web(1)" id="9">
         <application path="/" applicationPool="Clr4IntegratedAppPool">
           <virtualDirectory path="/" physicalPath="E:\abc\project\dev\web" />
         </application>
         <bindings>
           <binding protocol="http" bindingInformation="*:57976:localhost" />
           <binding protocol="http" bindingInformation="*:57976:192.XXX.X.XXX" />
         </bindings>
       </site>
   

Updated:

For windows 10 or Visual Studio 2015 users, you may get the error message below:

Unable to launch the IIS Express Web server, Failed to register URL, Access is denied

Solution:

1. Close Visual Studio
2. Right click on Visual Studio > Run as Administrator

Reference: https://azure.microsoft.com/en-us/documentation/articles/mobile-services-dotnet-backend-how-to-configure-iis-express/