C# - Allow POST To "static" Files On Development Server?

I have an issue where a service needs to POST to the root of my ASP.net application that is running in my Visual Studio development instance (/myapp/ for example). However, ASP.net complains that "The HTTP verb POST used to access path '/myapp/' is not allowed.

How can I enable post to this path? Would URL rewriting be better (rewirte /myapp/ to /myapp/Default.aspx)?

EDIT:

I was just able to provide a work around by adding this to my Global.asax:

void Application_BeginRequest(object sender, EventArgs e) {
string p = Request.Path;
if (p.Equals("/myapp/")) {
var query = "?" + Request.QueryString.ToString();
if (query.Equals("?")) {
query = "";
}
Context.RewritePath("/myapp/Default.aspx" + query);
}
}

But I haven't tested this much and I am curious if there is a better solution. This also won't work when deployed to IIS.