enable CORS setting for soap web service on visual studio development server

Question

i am trying to add CORS setting by enabling "Access-Control-Allow-Origin" header in Web Service method shown below. However, I'm still getting error: No 'Access-Control-Allow-Origin' header is present on the requested resource.' Am i missing anything?

        [ScriptMethod(UseHttpGet = true)]
        [WebMethod]
        public ClientData[] GetClientData(int Number)
        {

            HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "http://localhost:52630");

            ClientData[] Clients = null;

            if (Number > 0 && Number <= 10)
            {
                Clients = new ClientData[Number];
                for (int i = 0; i < Number; i++)
                {
                    Clients[i].Name = "Client " + i.ToString();
                    Clients[i].ID = i;
                }
            }

            return Clients;
        }

Chrome does not support localhost for CORS, see: http://stackoverflow.com/questions/10883211/deadly-cors-when-http-localhost-is-the-origin — Shiraz Bhaiji, Jul 21 '15 at 20:14
@Shiraz: so far it only works in IE, doesn't work in Mozilla or chrome either. — user3399326, Jul 21 '15 at 20:56

TLJ · Answer 1 · 2015-11-06T08:26:34.607

2

Put this in your web.config

You can adjust if needed. This example I only open for .aspx

<configuration>
  <system.web>
      <httpHandlers>
        <add verb="GET,HEAD,POST,OPTIONS" path="*.aspx" type="System.Web.UI.PageHandlerFactory" />
      </httpHandlers>
  </system.web>
</configuration>

You may need something like this too.

    if (Request.HttpMethod == "OPTIONS")
    {
        Response.AppendHeader("Access-Control-Allow-Origin", "*");
        Response.AppendHeader("Access-Control-Allow-Headers", "Content-Type");
        return;
    }

edited Nov 06 '15 at 08:26

answered Nov 06 '15 at 08:08

TLJ

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@PoloHoleSet On your handler. The basic idea is that, we need to intercept the option preflight and reply with appropriate headers. – TLJ Apr 04 '18 at 16:12
That's what I suspected, but sometimes my assumptions lead me astray. Thanks for circling back so long after answering. – PoloHoleSet Apr 04 '18 at 16:42

enable CORS setting for soap web service on visual studio development server

1 Answers1