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Create a console app that runs the following line of code:
var uri = new Uri ("https://_foo/bar.html");
The url is parsed.
System.UriFormatException: Invalid URI: The hostname could not be parsed.
at System.Uri.Parse (UriKind kind, System.String uriString) [0x00020] in /private/tmp/source-mono-4.4.0-c7sr1/bockbuild-mono-4.4.0-branch-c7sr1/profiles/mono-mac-xamarin/build-root/mono-x86/mcs/class/System/System/Uri.cs:1306
at System.Uri.ParseUri (UriKind kind) [0x00000] in /private/tmp/source-mono-4.4.0-c7sr1/bockbuild-mono-4.4.0-branch-c7sr1/profiles/mono-mac-xamarin/build-root/mono-x86/mcs/class/System/System/Uri.cs:1176
at System.Uri..ctor (System.String uriString, Boolean dontEscape) [0x00059] in /private/tmp/source-mono-4.4.0-c7sr1/bockbuild-mono-4.4.0-branch-c7sr1/profiles/mono-mac-xamarin/build-root/mono-x86/mcs/class/System/System/Uri.cs:282
at System.Uri..ctor (System.String uriString) [0x00000] in /private/tmp/source-mono-4.4.0-c7sr1/bockbuild-mono-4.4.0-branch-c7sr1/profiles/mono-mac-xamarin/build-root/mono-x86/mcs/class/System/System/Uri.cs:160
On Windows the code works without any exception being thrown.
Mono 4.4.2 (mono-4.4.0-branch-c7sr1/f72fe45 Wed Jul 27 16:20:13 EDT 2016)
Fixed in master and Mono 4.6