I while back I worked on a Silverlight application that was hosted in SharePoint. The Silverlight application was to call a web service written by a third party vendor in .NET 2.0.
Problem
As what we all normally would do in a Silverlight app is to call this web service. However, I got the following error when my application tries to call the asmx web service:
“An error occurred while trying to make a request to URI 'http://localhost:1000/webservice.asmx'. This could be due to attempting to access a service in a cross-domain way without a proper cross-domain policy in place, or a policy that is unsuitable for SOAP services. You may need to contact the owner of the service to publish a cross-domain policy file and to ensure it allows SOAP-related HTTP headers to be sent. Please see the inner exception for more details.”
Solution
After some research, I found a recipe to get it going again:
- Create a new file within the web service application (at the root of the requesting domain), called clientaccesspolicy.xml with the following contents:
<?xml version="1.0" encoding="utf-8"?>
<access-policy>
<cross-domain-access>
<policy>
<allow-from http-request-headers="*">
<domain uri="*"/>
</allow-from>
<grant-to>
<resource path="/" include-subpaths="true"/>
</grant-to>
</policy>
</cross-domain-access>
</access-policy>
- Create another file within the web service application(at the root of the requesting domain), called crossdomain.xml with the following contents:
<?xml version="1.0" encoding="utf-8"?>
<cross-domain-access>
<allow-http-request-headers-from domain="*" headers="*"/>
</cross-domain-access>
After adding these policy files, my app started working. Hope this helps.
References
http://timheuer.com/blog/archive/2008/06/10/silverlight-services-cross-domain-404-not-found.aspx
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