CORS - ajax POST Request, Handle 405 method not found


Today, when I published WCF service and website on UAT server, I started getting 405 (Method not allowed) error on ajax POST requests. After searching a lot on internet, I finally fixed the issue. I am hoping that my findings will save others time.


We can fix this issue using following different options
  1. Add following code in WCF global.asax file. Publish the code and deploy it.
protected void Application_BeginRequest(object sender, EventArgs e)
{
    HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "*");
    if (HttpContext.Current.Request.HttpMethod == "OPTIONS")
    {
        HttpContext.Current.Response.AddHeader("Cache-Control", "no-cache");
        HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods", "GET, POST");
        HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers", "Content-Type, Accept, Authorization");
        HttpContext.Current.Response.AddHeader("Access-Control-Max-Age", "1728000");
        HttpContext.Current.Response.End();
    }
}
  1. If you are still getting same issue then add following line of code in your WCF web.config file
<handlers>
                                     <remove name="OPTIONSVerbHandler" />
                                     <remove name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" />
                                     <remove name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" />
                                     <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
                                  <add name = "OPTIONSVerbHandler" path="*." verb="GET,HEAD,POST,DEBUG,DELETE,PUT,PATCH,OPTIONS" />
                                     <add name = "ExtensionlessUrlHandler-ISAPI-4.0_32bit" path="*." verb="GET,HEAD,POST,DEBUG,DELETE,PUT,PATCH,OPTIONS" />
                                     <add name = "ExtensionlessUrlHandler-ISAPI-4.0_64bit" path="*." verb="GET,HEAD,POST,DEBUG,DELETE,PUT,PATCH,OPTIONS" />
                                     <add name = "ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="GET,HEAD,POST,DEBUG,DELETE,PUT,PATCH,OPTIONS" />
                 </handlers>
    <modules runAllManagedModulesForAllRequests="true" />
    
                   <httpProtocol>
                                     <customHeaders>
                                                         <add name="Access-Control-Allow-Origin" value="*" />
                                     <add name="Access-Control-Allow-Methods" value="GET, POST" />
                                     <add name="Access-Control-Allow-Headers" value="X-Requested-With, Content-Type" />
                                     </customHeaders>
                   </httpProtocol>
 
 

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