In ASP.NET the HttpBrowserCapabilities object easily allows you to determine which web browser your site’s visitors are using. This information is pulled from the User Agent data sent by each visitors web browser.
Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:18.104.22.168) Gecko/20070515 Firefox/22.214.171.124
Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv 126.96.36.199) Gecko/20070515 Firefox/188.8.131.52
I have since fixed this issue in aspNETserve, and it now correctly outputs the __doPostBack method. What started as a frustrating attempt to get the __doPostBack method to be properly included for pages hosted within my ASP.NET web server, turned into a chance to better understand the inner workings of ASP.NET.