ASMX Javascript proxy using different host headers

I am using an ASMX service in my app and would like it to point to a particular web service URL.

I have defined it as below:

string serviceUrl = SPContext.Current.Web.Url + "/_vti_bin/MyService.asmx";

ScriptManager scriptManager = ScriptManager.GetCurrent(Page);

if (scriptManager != null) scriptManager.Services.Add(new ServiceReference(serviceUrl));
else
{
    scriptManager = new ScriptManager();
    scriptManager.Services.Add(new ServiceReference(serviceUrl));

    Page.Form.Controls.Add(scriptManager);
}

Here SPContext.Current.Web.Url ==> http://mysite/mysubsite

But when I invoke the service from Javascript like below, host header inspection in the Firebug suggests that the Javascript proxy is actually calling the service at: http://mysite/_vti_bin/MyService.asmx/Execute

MyWorkCore.API.Execute("GetData", dataXml, function (response) {
    // doing something he开发者_如何转开发re
});

You specified server relative path, as I see it. Try using and resolving the path like this:

~site/_vti_bin/MyService.asmx

In SPUtility class there a function that resolves such prefixed paths with prefixes "~site" (resolved to current SPWeb url) and "~sitecollection" that resolved to current SPSite URL.

Here "current" means SPContext.Current.Site for SPSite and SPContext.Current.Web for SPWeb.