I was working on an application with http client and it even included some use cases with involving requests through proxy, was actually in lookout for a website which responds slow. Found one nice utility which someone developed and sharing here as it might help others who end in same boat.
Source: https://stackoverflow.com/a/9770981
Httpbin is awesome that it works as a HTTP request mirror which provides all the request information like headers, cookies, IP, user agent, redirects, dummy content in html, xml, images etc, auth support, setting cookies and lot more.