topic Re: IIS CORS Access-Control-Allow-Origin' header contains multiple values in ArcGIS JavaScript Maps SDK Questions

IIS CORS Access-Control-Allow-Origin' header contains multiple values

Vakhtang_Zubiashvili — Tue, 10 May 2022 12:12:21 GMT

Hi all,

Again, i am about CORS issue.

I sue IIS for my web map.

So, in my map i sue wms service from another server, that's why i get CORS issue. When i use CORS extension on chrome, i can use this service without problem.

I looked around in google, in stack, but could not find decision of this.

In web.config i have added:

<?xml version="1.0" encoding="utf-8"?> <configuration> <system.webServer> <httpProtocol allowKeepAlive="false"> <customHeaders> <clear /> <add name="Access-Control-Allow-Origin" value="*" /> <add name="Access-Control-Allow-Methods" value="GET, PUT, POST, DELETE, HEAD, OPTIONS" /> <add name="Access-Control-Allow-Headers" value="*" /> </customHeaders> </httpProtocol> </system.webServer> </configuration>

but no result, still Access-Control-Allow-Origin' header contains multiple values.

My map is in Default web Site folder.

I used proxy, but it did not help.

Any ideas how it could be fixed?

Re: IIS CORS Access-Control-Allow-Origin' header contains multiple values

ReneRubalcava — Tue, 10 May 2022 18:43:21 GMT

edit - Is this on the server you are trying to get the WMS from?

Re: IIS CORS Access-Control-Allow-Origin' header contains multiple values

AdrianaPaese — Tue, 10 May 2022 18:25:30 GMT

The CORS extension on Chrome has helped me too. Thank you

Re: IIS CORS Access-Control-Allow-Origin' header contains multiple values

Vakhtang_Zubiashvili — Wed, 11 May 2022 06:26:25 GMT

WMS is outsource, it is on another server and i have no access on it to change CORS options.

Re: IIS CORS Access-Control-Allow-Origin' header contains multiple values

ReneRubalcava — Wed, 11 May 2022 14:11:53 GMT

Ah, you can't fix this via your server then. The origin server has deliberately disabled CORS or only has certain allows. You can try to write a proxy server for this. The crossorigin.me dev site publishes their source code and you can try to use that as a base for your own. https://github.com/corihudson/crossorigin.me