protected string PostStringResultOrNull(string relativePath, NameValueCollection form)
{
using (var browser = new Browser())
{
browser.AppendHeader("Accept-Language", "en-GB,en");
var result = browser.Post("/" + relativePath, form);
if (result.StatusCode == 404 || result.ResponseText.Contains("The resource cannot be found")) return null;
Assert.Equal(200, result.StatusCode);
return result.ResponseText;
}
}