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If this were a dynamic response, I'd simply do Response.Headers.Add("Access-Control-Allow-Origin", "*"); but I have a static file I'd like to allow cross domain access to.
Is there a way to assign this header to a particular file just using web.config? Say it's just example.com/flat.json
I guess I could route the file to dynamic page, but that would be a bit silly.
673
Sounds like the recommended way to do it is to have your server read the Origin header from the client, compare that to the list of domains you would like to allow, and if it matches, echo the value of the Origin header back to the client as the Access-Control-Allow-Origin header in the response.
Right click the site you want to enable CORS for and go to Properties. Change to the HTTP Headers tab. In the Custom HTTP headers section, click Add. Enter Access-Control-Allow-Origin as the header name.
You need just need your site to send the HTTP header Access-Control-Allow-Origin with the value * to "turn off" CORs (well allow any origin).
This should work
<location path="Sample.txt">
<system.webServer>
<httpProtocol>
<customHeaders>
<add name="Access-Control-Allow-Origin" value="*" />
</customHeaders>
</httpProtocol>
</system.webServer>
</location>
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