JS cannot call Web api, it will get block, add code below to Web API web.config to enable cors.
<system.webServer>
<modules runAllManagedModulesForAllRequests="true" />
<!--<handlers>
<add
name="ExtensionlessUrlHandler-Integrated-4.0" path="*."
verb="*" type="System.Web.Handlers.TransferRequestHandler"
preCondition="integratedMode,runtimeVersionv4.0" />
</handlers>-->
<httpProtocol>
<customHeaders>
<!--<add
name="Access-Control-Allow-Origin" value="*" />
<add
name="Access-Control-Allow-Headers" value="*" />
<add
name="Access-Control-Allow-Methods" value="*" />-->
<remove name="X-Powered-By" />
</customHeaders>
</httpProtocol>
</system.webServer>
