How to get the request url from HttpServletRequest [duplicate]

This question already has answers here: How to get the URL fragment identifier from HttpServletRequest (2 answers) Closed 6 years ago.

Say i make a get request like this:

GET http://cotnet.diggstatic.com:6000/js/loader/443/JS_Libraries,jquery|Class|analytics|light开发者_如何学Pythonbox|label|jquery-dom|jquery-cookie?q=hello#frag HTTP/1.0
Host: cotnet.diggstatic.com:6000

My servlet takes request like this: HttpServletRequest req;

When i debug my server and execute, i get the following:

req.getRequestURL().toString() = "http://cotnet.diggstatic.com:6000/js/loader/443/JS_Libraries,jquery%7cClass%7canalytics%7clightbox%7clabel%7cjquery-dom%7cjquery-cookie"
req.getRequestURI() = "/js/loader/443/JS_Libraries,jquery%7cClass%7canalytics%7clightbox%7clabel%7cjquery-dom%7cjquery-cookie"
req.getQueryString() = "q=hello"

How does one get the fragment information ? Also, when i debug the request, i see a uri_ field of type java.net.URI which has the fragment information. This is exactly what i want. How can i get that ?

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"The fragment identifier functions differently than the rest of the URI: namely, its processing is exclusively client-side with no participation from the server." Wikipedia about the Frament Identifiert

For further reference see the RFC 2394 Section 4.1