Response for preflight has invalid HTTP status code 405
Looks like I have found solution. I just added second method:
[<OperationContract>]
[<WebInvoke(UriTemplate = "PostTest",
RequestFormat= WebMessageFormat.Json,
ResponseFormat = WebMessageFormat.Json, Method = "POST")>]
abstract PostTest: obj: Test -> unit
[<OperationContract>]
[<WebInvoke(UriTemplate = "PostTest",
RequestFormat= WebMessageFormat.Json,
ResponseFormat = WebMessageFormat.Json, Method = "OPTIONS")>]
abstract PostTestOptions: unit -> unit
It is just empty methods that do nothing. I don't know the reason, but all is working.
I want to show what work for me.
First you must enable CORS on web.config
(like Mihai sad):
<httpProtocol>
<customHeaders>
<add name="Access-Control-Allow-Origin" value="*" />
<add name="Access-Control-Allow-Headers" value="Content-Type" />
<add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
</customHeaders>
</httpProtocol>
If you have some extra HEADER parameter, you must add it to Access-Control-Allow-Headers, like:
<add name="Access-Control-Allow-Headers" value="Content-Type, X-Your-Extra-Header-Key" />
And finally, to handle OPTIONS requests you must reply with empty response, adding in your application class:
protected void Application_BeginRequest()
{
if (Request.Headers.AllKeys.Contains("Origin") && Request.HttpMethod == "OPTIONS")
{
Response.Flush();
}
}
Although this already has an answer, but heres my solution.
In the web config you have to remove the instruction to <remove name="OPTIONSVerbHandler" />
First add in the customHeaders
<httpProtocol>
<!-- THESE HEADERS ARE IMPORTANT TO WORK WITH CORS -->
<customHeaders>
<add name="Access-Control-Allow-Origin" value="*" />
<add name="Access-Control-Allow-Methods" value="POST, PUT, DELETE, GET, OPTIONS" />
<add name="Access-Control-Allow-Headers" value="content-Type, accept, origin, X-Requested-With, X-Authentication, name" />
</customHeaders>
</httpProtocol>
Then either comment out or delete the instruction to remove the OPTIONSverbHandler
<handlers>
<remove name="ExtensionlessUrlHandler-Integrated-4.0" />
<!-- <remove name="OPTIONSVerbHandler" /> -->
<remove name="TRACEVerbHandler" />
<add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
</handlers>