Use this in Your WebConfig
<system.webServer>
<modules runAllManagedModulesForAllRequests="true" />
<httpProtocol>
<customHeaders>
<add name="Access-Control-Allow-Origin" value="*" />
<add name="Access-Control-Allow-Headers" value="Content-Type" />
</customHeaders>
</httpProtocol>
</system.webServer>
<system.serviceModel>
<behaviors>
.
.
.
</behaviors>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true" />
<standardEndpoints>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true" />
<httpProtocol>
<customHeaders>
<add name="Access-Control-Allow-Origin" value="*" />
<add name="Access-Control-Allow-Headers" value="Content-Type" />
</customHeaders>
</httpProtocol>
</system.webServer>
<system.serviceModel>
<behaviors>
.
.
.
</behaviors>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true" />
<standardEndpoints>