![]() Go to the Properties folder in your WebAPI project and open launchSettings.json The launchSettings.json file is in your WebAPI project in the Properties folder. If you’re running your Angular application from Visual Studio or Visual Studio for Mac, you’ll need to add that environment variable setting to the launchSettings.json file for your project. "ASPNETCORE_HOSTINGSTARTUPASSEMBLIES": "" Enable launching a web browser when ASP.NET Core starts. That’s what that file is in your Angular app. ![]() When you do Angular work in development mode, Angular helps you to keep stuff simple by using a proxy server to serve your app. What’s Going Wrong? It’s the ASP.NET Core SPA Proxy. The Swagger UI for the services came up just fine…that’s unexpected. It’s the Angular app isn’t launching or somehow isn’t available. Totally unexpected and that also means that the WebAPI project actually *did* launch properly. What was unusual was that if I went to that the swagger ui would come up. The browser would open on port 5001 like I’d expect. : Information: Now listening on: The app would launch. NET Core launch, I noticed that there was a message saying that it was listening on a completely wrong port. What could possibly have gone wrong?!?!?! Angular application returns HTTP 404 Not Found error on launch from VSCode The error is a basic HTTP 404 Not Found error. ![]() It’s been working for months but for some reason today, it completely stopped working when I launched it from VSCode, Visual Studio, or the. I’ve got an Angular application that runs using. ![]()
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