Online Url Encoder

I have the following code:

String a1 = "gùt";String a2 = "gùt";

When I do

URLEncoder.encode(a1, "UTF-8")URLEncoder.encode(a2, "UTF-8")

I am receiving different results. How is this possible?I was counting on the fact that I am receiving the same result. Is there a way I can use the encoder and get the same result for the same string value?

I'm looking for a (fast) standard implementation for base64url according to RFC4648 in C#.

I found HttpServerUtility.UrlTokenEncode but it looks like this doesn't follow RFC4648 (UrlTokenEncode adds a number at the end which indicates the number of = signs that were removed; see here and here).

Example:

base64 encoding:

Convert.ToBase64String(System.Text.Encoding.ASCII.GetBytes("AA")); //returns "QUE="

base64url encoding:

HttpServerUtility.UrlTokenEncode(System.Text.Encoding.ASCII.GetBytes("AA")); //returns "QUE1" but I would expect "QUE"

When I read the xml through a URL's InputStream, and then cut out everything except the url, I get "http://cliveg.bu.edu/people/sganguly/player/%20Rang%20De%20Basanti%20-%20Tu%20Bin%20Bataye.mp3".

As you can see, there are a lot of "%20"s.

I want the url to be unescaped.

Is there any way to do this in Java, without using a third-party library?

I've been looking at Network.HTTP, but can't find a way to create properly URL encoded key/value pairs.

How can I generate the post data required from [(key, value)] pair list for example? I imagine something like this already exists (perhaps hidden in the Network.HTTP package) but I can't find it, and I'd rather not re-invent the wheel.

Sorry to bother, but I cannot find any reference or manual includes how to write this special letter capital İ inside an URL.

This is the actual URL:

https://www.hocahanimurunleri.com/image/catalog/PROPOLİS DAMLA 20 GR.jpg

It is an i with dot not with grave or acute. Anybody knows how to or found a reference could share it with me.

Thanks in advance.