Add CORS layer to mediator server for cross-origin requests

[Hermann-Core]

No description provided.

[Christiantyemele]

Though we have no way of testing it 😄

[IngridPuppet]

Though we have no way of testing it 😄

Start the server and do fetch('http://localhost:port') in a browser console. If the request goes through then it is all fine.

[Christiantyemele]

Though we have no way of testing it 😄

Start the server and do fetch('http://localhost:port') in a browser console. If the request goes through then it is all fine.

This will be a get request which is allowed by default we need to test a post request instead

[IngridPuppet]

This will be a get request which is allowed by default we need to test a post request instead.

Note that a GET request is not allowed by default with regard to CORS policy. Also, if you need to test POST requests specifically, you can set the option on the fetch command. Long story short, CORS configurations are testable.