创建多部分表格边界的有效字符是什么? [英] What are valid characters for creating a multipart form boundary?

问题描述

在HTML表单中，用于创建多部分边界的有效字符是什么?

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

推荐答案

根据 RFC 2046 ，第5.1.1节:

According to RFC 2046, section 5.1.1:

 boundary := 0*69<bchars> bcharsnospace

 bchars := bcharsnospace / " "

 bcharsnospace := DIGIT / ALPHA / "'" / "(" / ")" /
                  "+" / "_" / "," / "-" / "." /
                  "/" / ":" / "=" / "?"

因此它的长度可以在1到70个字符之间，由字母数字和在列表中看到的标点组成.除末尾外，都允许有空格.

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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