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From: Nigel Wade <nmw@ion.le.ac.uk>
Newsgroups: comp.lang.java.programmer
Subject: Re: URLEncoder and #
Date: Wed, 18 Jun 2014 11:30:23 +0100
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On 18/06/14 10:37, Roedy Green wrote:
> It seems URLEncoder converts # to %23
>
> Why would there be any need to encode it?

Because # is a special character in a URI. It separates the main URI from a fragment suffix. Have you never used "NAME" 
tag in your web pages to identify sub-sections? The browser shouldn't send anything after a # in a request, it's used by 
the browser to identify a fragment within the returned page.

The URI specification should satisfy your curiosity.

>
> The AppVisor people are complaining about URLs containing # saying
> they need to be URLEncoded.  Surely that is not true.
>

I think it probably is true.