Headers not working

[Gagan Janjua]

Hi, I am doing something like this

		let client =  graphql("http://localhost:5000/graphql", {
		  headers: {
		    "Access-Control-Allow-Origin": "*"
		  }
		})

but I am getting the following error
Access to XMLHttpRequest at 'http://localhost:5000/graphql' from origin 'http://localhost:8080' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
Can you please let me know what I am doing wrong here ?
Thanks

[Fatih Kadir Akın]

Access-Control-Allow-Origin: * header should be sent by the server not client. That's why your request throws an error.

[Gagan Janjua]

Thanks , setting it on the server fixed the issue . Much Appreciated.