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Asked: May 10, 20262026-05-10T16:01:54+00:00 2026-05-10T16:01:54+00:00

In an HTML form post what are valid characters for creating a multipart boundary?

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In an HTML form post what are valid characters for creating a multipart boundary?

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  1. 2026-05-10T16:01:55+00:00Added an answer on May 10, 2026 at 4:01 pm

    According to RFC 2046, section 5.1.1:

     boundary := 0*69<bchars> bcharsnospace   bchars := bcharsnospace / " "   bcharsnospace := DIGIT / ALPHA / "'" / "(" / ")" /                   "+" / "_" / "," / "-" / "." /                   "/" / ":" / "=" / "?" 

    So it can be between 1 and 70 characters long, consisting of alphanumeric, and the punctuation you see in the list. Spaces are allowed except at the end.

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