Enable CORS in ASP.NET Core Web Api

Bogdan Bujdea

Expert generalist • Independent Contractor • Microsoft MVP • Home Assistant enthusiast Hi there! I'm Bogdan Bujdea, a software developer from Romania. I'm currently a .NET independent contractor, and in my free time I get involved in the local .NET community or I'm co-organizing the @dotnetdays conference. I consider myself an expert generalist, mostly because I enjoy trying out new stuff whenever I get the chance and I get bored pretty easily, so on this blog you'll see me posting content from programming tutorials to playing with my smart gadgets.

Independent Contractor • Microsoft MVP • Home Assistant enthusiast

No matter how many times I do this on my local machine I always forget how to enable CORS for "*", just for testing something quick on my machine. This means that there's a proper way to do this and there's a "I don't care how I do it, just stop my requests from returning CORS Error".

CORS Error Dev Tools

The snippet below is for the latter, so it's just for development, but in the next few days I'll try to cover how to do this in production as well.

https://gist.github.com/thewindev/e1f12436b3de7964ccffd8dc23243328

Basically, we do 3 things to enable CORS:

Create a policy with an arbitrary name
Configure that policy with the origins we want to allow (in my case, I use "*")
Enable CORS using for that policy

Enable CORS in ASP.NET Core Web Api

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