Handling network exceptions (Android)

[ncruces]

A request that fails on Android (due to a network error) is currently throwing a Java.Net.IOException, which (in Xamarin.Android) inherits directly from System.Exception.

This is unfortunate because the only way of dealing with this in a PCL is to catch every possible System.Exception, and use reflection from there (or IoC) since you obviously can't use the Java.* classes in a PCL.

I don't suggest ModernHttpClient marshals every exception, but maybe it makes sense to catch all Java.Lang.IOException here and marshal them into System.Net.WebException.
#153 seems related.

Don't know about iOS?

[paulhickman-a365]

I get this problem when using a Wi-Fi network that requires you to login in the browser before being able to reach internet hosts, and I am connected to Wi-Fi but not logged in. A Java.Net.ConnectionException occurs which derives from Java.Net.IOException.

[viniciussalvati]

I know this issue seems old, but someone already made a Pull Request to fix this. See #116

Since the merge request itself is old, and the project seems somewhat abandoned, I fixed the issue, based on the merge request I mentioned, with the following class, https://gist.github.com/viniciusmelquiades/629fe226bf7fa8564fd0de2aab85b446