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Editorial Team
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Asked: 2026-05-16T14:07:34+00:00

So, the javadoc for URLEncoder’s encode and URLDecoder’s decode have this note in them:

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So, the javadoc for URLEncoder’s encode and URLDecoder’s decode have this note in them:


Note: The World Wide Web Consortium Recommendation states that UTF-8 should be used. Not doing so may introduce incompatibilites."

However, if someone sends in a request with a different encoding type, wouldn’t it be a bad idea to encode with UTF-8? Is there anything wrong with checking a header (if it exists) and using whatever encoding is specified in there? Perhaps some more background to this note would allow it to make more sense to me, if anyone can provide it.

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  1. Editorial Team

    In the same documentation

    The recommended encoding scheme to use is UTF-8. However, for compatibility reasons, if an encoding is not specified, then the default encoding of the platform is used.

    You can change the encoding, but as it’s not W3C compliant it would be a bad idea.

    Resources :

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