I was playing around with swagger-ui and was trying to point it to a local endpoint that I started with IIS Express. I was getting an error saying that it needed the endpoint to accept Access-Control-Allow-Origin requests.
I went Googling and it couldn't find anything specific to IIS Express but managed to use some guidance for full blown IIS.
The solution is to go to
C:\Program Files (x86)\IIS Express\AppServer and open the
httpProtocol and you should see this:
<httpProtocol> <customHeaders> <clear /> <add name="X-Powered-By" value="ASP.NET" /> </customHeaders> <redirectHeaders> <clear /> </redirectHeaders> </httpProtocol>
Now add this to the
<add name="Access-Control-Allow-Origin" value="*" /> <add name="Access-Control-Allow-Headers" value="Content-Type" />
Just bear in mind this opens up your webserver so you may need to find something alternative for a live production environment.
Anyway you should now be able to start accepting requests via CORS when you fire up IISExpress