How to Fix net_http_client_execution_error in UWP Apps Accessing Localhost?

Resolving net_http_client_execution_error in UWP Apps Accessing Localhost

The Issue:

UWP applications, after deployment via .appxbundle, may encounter a net_http_client_execution_error when attempting to access localhost (127.0.0.1), typically a local database. This error doesn't manifest during Visual Studio debugging. The root cause is Windows' default restriction on localhost access for UWP apps.

The Fix:

Microsoft's checknetisolation.exe utility allows granting loopback exceptions. Here's how to enable it:

1. Open a command prompt (cmd.exe).
2. Navigate to the checknetisolation.exe directory (usually C:WindowsSystem32).
3. Execute the following command, replacing <package family name> with your app's package family name:

<code>checknetisolation loopbackexempt -a -n=<package family name></code>

4. Verify the exemption using:

<code>checknetisolation loopbackexempt -l</code>

Important Considerations:

• Locate your app's package family name within Visual Studio's Package.appxmanifest (Packaging tab) or using PowerShell's Get-AppxPackage cmdlet.
• If the exemption becomes ineffective, clear all existing exemptions:

<code>checknetisolation loopbackexempt -c</code>

• Then, re-apply the exemption individually for your application.
• For comprehensive information, consult Microsoft's documentation: https://www.php.cn/link/10a9288f519d683f87f6443f7b6810e6 (Note: This link may be outdated. Search for "UWP Localhost Access" on the Microsoft Docs website for the most up-to-date information).

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