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CORS error - not the normal sort

AdrianMarsden

Hi
This Cross Origin thingy, AKA CORS has been discussed many time, however I have read those threads and none covers exactly what I am seeing.

I am only seeing this issue when I make a request for a legend. The error doesn't always happen. At 3.5 it would happen a few times, 2 out of 10 start ups. When it fails my TOC breaks. So I was naughty and put a loop in to simply try again. The users didn't notice.

Now, using 3.7 and IE8 I get this every time, and of course my loop goes on forever.

I get

XMLHttpRequest cannot load http://ARGISserver/arcgis/rest/services/LIVEinternal/aerials/MapServer/legend?f=json. The 'Access-Control-Allow-Origin' whitelists only 'http://appURL'. Origin 'http://appURL_dev' is not in the list, and is therefore not allowed access. (index):1
k {stack: "Error: Unable to load http://ARGISserver/arcgis/rest???ev/arcgis_js_api/library/3.7/3.7/init.js:3570:29)", message: "Unable to load http://ARGISserver/arcgis/rest/servic???nternal/aerials/MapServer/legend?f=json status: 0", response: Object, status: 0, responseText: ""???}

So, have I forgotten that I've set one domain onto a whitelist somewhere? I can't recall doing so. Or is it a IE policy stting I have no control over?

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amenahgeebril

I have the same error
did you find it out?

AdrianMarsden

adding

  <system.webServer>   <httpProtocol>
     <customHeaders>
       <add name="Access-Control-Allow-Origin" value="*" />
     </customHeaders>
   </httpProtocol>
 </system.webServer>

to my web.config (using IIS7 )

Helped a lot - still get the odd issue, but that cleared my main one.

AdrianMarsden

OK - the error is now a bit more limited - certainly to Chrome based browsers.

I now get only
I get

XMLHttpRequest cannot load http://my server name/arcgis/rest/info?f=json. The 'Access-Control-Allow-Origin' whitelists only 'http://myURL, *'. Origin 'http://myURL' is not in the list, and is therefore not allowed access.

The request to http://my server name/arcgis/rest/info?f=json seems to be how the API determines if the server supports CORS (see http://forums.arcgis.com/threads/71824-quot-NetworkError-404-Not-Found-http-tasks.arcgis.com-ArcGIS-rest-info-f-json-quot)

It may be a genuine Chrome bug - see

https://code.google.com/p/chromium/issues/detail?id=321517

But it is causing issues here.

Cheers

ACM

AdrianMarsden

bump - still getting this - anyone any ideas how to make it stop?

RobertScheitlin__GISP

Adrian,

Have you considered just turning cors detection off? esri.config.defaults.io.corsDetection = false;

AdrianMarsden

Not sure I know where to put that. However, I replaced the * in the

http://server/arcgis/admin/system/handlers/rest/servicesdirectory

With some random text and that sorted it. I think too many things were trying to do the same thing - I have really no idea what I am talking about.

AdrianMarsden

Brill - that worked as well - much better than playing with options I had no idea about, many thanks

PaulCrickard1

Using Server Manager, in IIS, you can navigate to the site and under the HTTP Response Headers you can choose ADD, then title Access-Control-Allow-Origin and value is the IP or domain of the site you want to allow. Could always choose * for everyone.

While you can do it in your code, Server side is probably the best option.

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