为什么'％20'用作URL中的空格的原点 [英] The origin on why '%20' is used as a space in URLs

问题描述

我有兴趣知道为什么'％20'用作URL中的空格，特别是为什么使用％20，为什么我们甚至首先需要它。

I am interested in knowing why '%20' is used as a space in URLs, particularly why %20 was used and why we even need it in the first place.

推荐答案

这是编码百分比。某些字符不能在URI中（例如＃，因为它表示URL片段），所以它们用可以是（＃成为％23 ）

It's called percent encoding. Some characters can't be in a URI (for example #, as it denotes the URL fragment), so they are represented with characters that can be (# becomes %23)

这是同一篇文章的摘录： / p>

Here's an excerpt from that same article:

当保留的一个字符（保留字符）具有
特殊含义（保留目的）时某个上下文和一个URI
scheme表示有必要将该字符用于其他
目的，那么该字符必须是的百分号编码。
编码保留字符的百分比编码涉及将
字符转换为ASCII对应的字节值，然后将
表示为一对十六进制数字。 ，
前面带有百分号（％），用作转义字符，然后在URI中使用
代替保留字符。 （对于
非ASCII字符，通常将其转换为
UTF-8中的字节序列，然后每个字节值如上所示。）

When a character from the reserved set (a "reserved character") has special meaning (a "reserved purpose") in a certain context, and a URI scheme says that it is necessary to use that character for some other purpose, then the character must be percent-encoded. Percent-encoding a reserved character involves converting the character to its corresponding byte value in ASCII and then representing that value as a pair of hexadecimal digits. The digits, preceded by a percent sign ("%") which is used as an escape character, are then used in the URI in place of the reserved character. (For a non-ASCII character, it is typically converted to its byte sequence in UTF-8, and then each byte value is represented as above.)

空格字符的字符代码是 32 ：

The space character's character code is 32:

> ' '.charCodeAt(0)
32

哪个是 20基础16中的

> ' '.charCodeAt(0).toString(16)
"20"

百分号在前面标记，你得到％20 。

Tack a percent sign in front of it and you get %20.

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