RazorLight: System.UriFormatException: Invalid URI: The hostname could not be parsed

Describe the bug RazorLight works perfectly on my laptop (Windows). It also works perfectly at Azure Functions (Windows) (service functions to do various tasks)

However I have issues at Azure Application Service (Linux): (main application backend)

• Versions 2.0.0-rc.1 - 2.0.0-rc.3 works well without issues!
• Versions 2.0.0-rc.4, 2.0.0-rc.6 and 2.0.0 raise following exception:

Invalid URI: The hostname could not be parsed.

Stack Trace:

   at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind)
   at System.Uri..ctor(String uriString)
   at System.UriBuilder..ctor(String uri)
   at RazorLight.Compilation.DefaultAssemblyDirectoryFormatter.GetAssemblyDirectory(Assembly assembly)
   at RazorLight.Compilation.DefaultMetadataReferenceManager.<Resolve>b__12_2(Assembly p)
   at System.Linq.Enumerable.SelectArrayIterator`2.ToList()
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at RazorLight.Compilation.DefaultMetadataReferenceManager.Resolve(Assembly assembly, DependencyContext dependencyContext)
   at RazorLight.Compilation.DefaultMetadataReferenceManager.Resolve(Assembly assembly)
   at RazorLight.Compilation.RoslynCompilationService.EnsureOptions()
   at RazorLight.Compilation.RoslynCompilationService.get_ParseOptions()
   at RazorLight.Compilation.RoslynCompilationService.CreateSyntaxTree(SourceText sourceText)
   at RazorLight.Compilation.RoslynCompilationService.CreateCompilation(String compilationContent, String assemblyName)
   at RazorLight.Compilation.RoslynCompilationService.CompileAndEmit(IGeneratedRazorTemplate razorTemplate)
   at RazorLight.Compilation.RazorTemplateCompiler.CompileAndEmitAsync(RazorLightProjectItem projectItem)
   at RazorLight.Compilation.RazorTemplateCompiler.OnCacheMissAsync(String templateKey)
   at RazorLight.EngineHandler.CompileTemplateAsync(String key)
   at RazorLight.EngineHandler.CompileRenderAsync[T](String key, T model, ExpandoObject viewBag)
   at ... RazorEngineService.cs:line 90

To Reproduce Create an account at Azure (perhaps it allows to do that using a free tier) Create a new Application Service and select Linux as OS:

I use following source codes (cleaned from logging stuff and unnecessary methods)

public class RazorEngineService : IHtmlTemplateRendererService
{
	private static readonly IRazorLightEngine EngineService;

	static RazorEngineService()
	{
		EngineService = new RazorLightEngineBuilder()
			.UseEmbeddedResourcesProject(typeof(RazorEngineService))
			.SetOperatingAssembly(typeof(RazorEngineService).Assembly)
			.UseMemoryCachingProvider()
			.Build();
	}
	
	public async Task<string> GenerateCodeAsync<T>(string path, T model, string key)
	{
		var cacheResult = EngineService.Handler.Cache.RetrieveTemplate(key);
		if (cacheResult.Success)
		{
			// report is already compiled, render using a cache
			var templatePage = cacheResult.Template.TemplatePageFactory();
			return await EngineService.RenderTemplateAsync(templatePage, model);
		}

		return await EngineService.CompileRenderAsync(path, model);
	}
}

...

services.AddScoped<IHtmlTemplateRendererService, RazorEngineService>();

Expected behavior It shouldn’t fail 😃 It works well on 2.0.0-rc.3 and earlier. It doesn’t work after that

Information (please complete the following information):

• OS: Unix 4/5
• Platform: .NET Core 3.1
• RazorLight version: 2.0.0 (final)
• Are you using the OFFICIAL RazorLight package? Yes
• Rider 2022.1.1

Production environment (gathered from Azure Kudu):

OS version: Unix 5.4.0.1063
64 bit system: True
64 bit process: True
CLR version: 3.1.22

Development environment (gathered from Azure Kudu):

OS version: Unix 4.15.0.162
64 bit system: True
64 bit process: True
CLR version: 3.1.22

Additional context For now, I have to use 2.0.0-rc.3 until this issue is resolved in the latest RazorLight package I can test any internal builds at the Azure development environment - just let me know 😃