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Editorial Team
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Asked: 2026-06-04T20:48:13+00:00

first of all it is a userscript and I can’t change the server-side encoding.

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first of all it is a userscript and I can’t change the server-side encoding.

My problem is that when using encodeURIComponent() for encoding POST params (later sent via xhr.setRequestHeader), the characters are encoded in utf-8, but the server needs to receive iso-8859-1 data. Is there an alternative to encodeURIComponent() that would encode in iso-8859-1 ?

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To make sure you understand, here is an exemple:

A classic form on the website send é like this: yournewmessage:%E9

Ajax via xhr.send('yournewmessage='+encodeURIComponent('é')) sends this: yournewmessage:%E9%80%80

The server needs the former. Thanks to anyone who can help me.

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1 Answer

  1. Editorial Team

    So, I’ve since figured out this problem. What I did was searching for an equivalence between utf-8 and iso-8859-1, what I found was between utf-8 and cp1252 (Windows-1252) so there are two conversions, utf-8 to cp1252 and cp1252 to iso-8859-1 (these two having a lot of similarities)

    http://pastebin.com/jTDqR2PQ

    Ugly code, comments left in French, and unelegant solution, but I feel bad seeing this question unansered while I actually found a solution that works.

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