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Asked: 2026-05-10T17:23:43+00:00

I’m modifying a mature CGI application written in Perl and the question of content

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I’m modifying a mature CGI application written in Perl and the question of content encoding has come up. The browser reports that the content is iso-8859-1 encoded and the application is declaring iso-8859-1 as the charset in the HTTP headers but doesn’t ever seem to actually do the encoding. None of the various encoding techniques described in the perldoc tutorials (Encode, Encoding, Open) are used in the code so I’m a little confused as to how the document is actually being encoded.

As mentioned, the application is quite mature and likely predates many of the current encoding methods. Does anyone know of any legacy or deprecated techniques I should be looking for? To what encoding does Perl assume/default to when no direction is provided by the developer?

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  1. By default Perl handles strings as being byte sequences, so if you read from a file, and print that to STDOUT, it will produce the same byte sequence. If your templates are Latin-1, your output will also be Latin-1.

    If you use a string in text string context (like with uc, lc and so on) perl assumes Latin-1 semantics, unless the string has been decoded before.

    More on Perl, charsets and encodings

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