URL Decoder c# asp.net

Question

In a QueryString I have a part that looks like this

...u4w51EEcg8%2bj04e7C....

When I am using HttpUtility.UrlDecode the part "%2b" which represents a "+" just turns into a white space. I'm using HttpUtility.UrlEncode in the first place to encode the string.

Does anyone have any clue to what is going on?

CBHacking · Accepted Answer · 2015-10-14 07:38:32Z

1

Are you decoding twice? For convenience, a + sign in a URL decodes to (space, 0x20). While %2b should decode to +, decoding that will give you .

EDIT: Just saw your self-answer, and yeah, always check whether your getter functions / properties automatically decode for you. Double-decoding usually doesn't produce the desired result, and can even lead to security risks.

answered Oct 14, 2015 at 7:38

CBHacking

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user3314032 · Accepted Answer · 2015-10-14 07:37:28Z

0

It looks like that "Request.QueryString[]" decodewhatever it gets, so what happened was that I decode the QueryString 2 times, which makes "+" a whitespace.

answered Oct 14, 2015 at 7:37

user3314032

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