.NET MAUI iOS "Operation not supported on this platform"

[vladsava87]

Describe the bug
In a .NET MAUI project running on iOS, creating an new instance of RestClient, throws an "Operation not supported on this platform" exception.
Android works as expected.

To Reproduce
Create new .NET MAUI project, add RestSharp nuget and create new RestClient object.
Run project on iOS configuration.

Expected behavior
Create a new instance of RestClient

Stack trace
at System.Net.Http.NSUrlSessionHandler.set_Proxy(IWebProxy value)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
--- End of stack trace from previous location ---
at System.Net.Http.HttpClientHandler.InvokeNativeHandlerMethod(String name, Object[] parameters)
at System.Net.Http.HttpClientHandler.SetProxy(IWebProxy value)
at System.Net.Http.HttpClientHandler.set_Proxy(IWebProxy value)
at RestSharp.RestClient.ConfigureHttpMessageHandler(HttpClientHandler handler)
at RestSharp.RestClient..ctor(RestClientOptions options, Action`1 configureDefaultHeaders)
at RestSharp.RestClient..ctor()
at MauiAuth0App.MauiProgram.CreateMauiApp() in /Users/vladsteer73/Work/R&D/dotnet-maui-auth0-app-main/MauiProgram.cs:line 32

Desktop (please complete the following information):

• OS: macOS
• .NET 6
• Version 6.0.400

[FirewizzNL]

Got the same issue

[vadd98]

I have the same issue and I had to move to use the HttpClient in System.Net.Http

[FirewizzNL]

Thanks, I will move to too. After a bit of searching it looks like this has been like this for ages

[SebastianGrief]

Setting the handler.Proxy in RestClient.cs:142 is causing that because custom proxies are not allowed in NSUrlSessionHandler:625-628

So adding if(handler.SupportsProxy) handler.Proxy = Options.Proxy; in RestClient fixes the instance creation.
I've not yet tested that any further tho. Edit: Everything is working fine for me with that one line changed.

[dennisarriola]

Hello, I am experiencing this too. Hope this will be supported by RestSharp in their next release.
I'm using 108.0.1 by the way.

[alexeyzimarev]

Thanks, I will move to too. After a bit of searching it looks like this has been like this for ages

For's been there for ages is irrelevant as RestSharp doesn't work as it used to.

Thanks @SebastianGrief for the tip, mind opening a PR?

[dennisarriola]

Hello,

Is the fix included in v108.0.2 release?
I am using the library from nuget.

[alexeyzimarev]

https://github.com/restsharp/RestSharp/releases/tag/108.0.2

[dennisarriola]

Hello @alexeyzimarev

I tried v108.0.2 and it throws Timeout error.
Here's the exact error message, "The request was canceled due to the configured HttpClient.Timeout of 100 seconds elapsing."
I'm not sure if I missed something, but it works perfectly fine in Android and in Windows platforms. This only happens in iOs platform.

Do you have any idea on how to resolve this?

Thank you very much.

[dennisarriola]

Hello,

We would like to follow-up, if .NET Maui iOS platform is already supported by this fix?
Thank you.

[alexeyzimarev]

[alexeyzimarev]

The fix resolved the "Operation not supported on this platform" issue with the proxy. That's what issue was about, and that's why it's closed.