405 method options not allowed in asp.net web api controller?

Question

I have this very common issue where it says method not allowed (OPTIONS) for a GET request. I am getting the following error whenever I make an API

Answer 1

In your handlers after <remove name="OPTIONSVerbHandler"/>, add this:

<add name="OPTIONSVerbHandler" path="*" verb="OPTIONS"
  modules="IsapiModule" requireAccess="None"
  scriptProcessor="C:\Windows\System32\inetsrv\asp.dll"
  resourceType="Unspecified" />

See the answer at IIS hijacks CORS Preflight OPTIONS request.

Or maybe even just this:

 <add name="OPTIONSVerbHandler" path="*" verb="OPTIONS"
   modules="ProtocolSupportModule" requireAccess="None" />

If that doesn’t work, something that will is adding the following in your global.asax or other code:

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("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE");
        HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers", "Content-Type, Accept");
        HttpContext.Current.Response.AddHeader("Access-Control-Max-Age", "1728000" );
        HttpContext.Current.Response.End();
    }
}