Does Multiple URL Encoding result in different strings?

Question

Suppose one URL encodes a string.

urlencode(String1); => Becomes String2

Does successive url encoding on String2 create a string that is different from String 2?

meaning, urlencode(String2) == String2 ?

urlencode(String2) != String2 ?

Yes, if String1 contained characters that need encoding. Why not try out? — Pekka
– Pekka, Commented Jun 10, 2011 at 14:19

Jon · Accepted Answer · 2011-06-10 14:21:21Z

6

It certainly does create a different string, if the original string contained any non-alpha and non--_ character.

So, if the first urlencode encodes even one non-space, it will put a % in the resulting string as part of a %XX pattern. Subsequent urlencodes will re-encode that % (and start mangling your original string beyond recognition).

See it in action.

answered Jun 10, 2011 at 14:21

Jon

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