Getting express server to accept CORS request

Question

I have my express server running on http://localhost:3000 (I call this web-server) I have another application running on localhost:8100 (I call this simply \'app\')

Answer 1

I thought I'd had cracked this one before but once I swapped back from IIS to IIS Express, I started to get the error again!!

Started to Google once again and tried numerous suggestions, including the ones above but none of them worked until I found this article from Melvin's Web Stuff - Enable CORS IIS Express which suggested the following:

Add the following 2 lines to the section under the section:

to the applicationhost.config located in:

%HOMEPATH%\Documents\IISExpress\config

The final result should look like this:

This worked nicely for me but note that I didn't need the above when running in IIS.