ASP.net WEB API CORS 404 error

Question

I create a Windows Service with a integrated ASP.net Host and WEB API. The host and API works fine. When I use my internet Browser I get response from my controller, so no p

Answer 1

I think your cors configuration is not correct. Web client and web api connections are different so I understand your problem.

I'm writing our configuration below so you can check it.

ASP.NET (OWIN)

Install-Package Microsoft.Owin.Cors -Version 3.1.0

Startup.cs:

app.UseCors(CorsOptions.AllowAll)

Web Config:

<system.webServer>
  <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>
</system.webServer>

ASP.NET (System.Web)

Install-Package Microsoft.AspNet.WebApi.Cors

App_Start/WebApiConfig - Register method:

config.EnableCors();

FooController:

[EnableCors(origins: "*", headers: "*", methods: "*")]