HttpClientHandler Proxy Unsupported

Question

In the MacOS, Proxy member in HttpClientHandler throw exception "Operation is not supported on this platform."
In code is marked
[UnsupportedOSPlatform("browser")]
What mean is "browser"? I think it must by "maccatalist"?
Is there any way to use a proxy on MacOS in HttpClient?

Answer 1

Hello,

The NSUrlSessionHandler is an HTTP client handler that delegates its work to Apple’s built-in NSUrlSession.

Referring to the underlying NSUrlSessionHandler wrapper at NSUrlSessionHandler.cs, you could find the following code snippet:

   // We dont support any custom proxies, and don't let anybody wonder why their proxy isn't  
   // being used if they try to assign one (in any case we also return false from 'SupportsProxy').  
   [UnsupportedOSPlatform ("ios")]  
   [UnsupportedOSPlatform ("maccatalyst")]  
   [UnsupportedOSPlatform ("tvos")]  
   [UnsupportedOSPlatform ("macos")]  
   public IWebProxy? Proxy {  
   get => null;  
   set => throw new PlatformNotSupportedException ();  
   }  

Therefore, we could know that HttpClientHandler doesn't support custom proxies in MacCatalyst.

There is a pull request in progress to implement this for .Net 7. You could follow this issue: .NET Implement NSUrlSessionHandler members that throw PlatformNotSupportedException #14632.

Best Regards,

Alec Liu.

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