URL 中的空格? [英] Spaces in URLs?

问题描述

w3fools 声称 URL 可以包含空格:http://w3fools.com/#html_urlencode

w3fools claims that URLs can contain spaces: http://w3fools.com/#html_urlencode

这是真的吗?URL 如何包含未编码的空格?

Is this true? How can a URL contain an un-encoded space?

我的印象是 HTTP 请求的请求行 使用了空格作为分隔符，格式为 {the method}{space}{the path}{space}{the protocol}:

I'm under the impression the request line of an HTTP Request uses a space as a delimiter, being formatted as {the method}{space}{the path}{space}{the protocol}:

GET /index.html http/1.1

那么 URL 怎么可以包含空格呢?如果可以，用+代替空格的做法从何而来?

Therefore how can a URL contain a space? If it can, where did the practice of replacing spaces with + come from?

推荐答案

URL 不得包含文字空格.它必须使用 百分比编码 或不同的编码进行编码使用网址安全字符(例如application/x-www-form-urlencoded 使用 + 而不是 %20 作为空格).

A URL must not contain a literal space. It must either be encoded using the percent-encoding or a different encoding that uses URL-safe characters (like application/x-www-form-urlencoded that uses + instead of %20 for spaces).

但是这句话是对是错取决于解释:从语法上讲，URI 不能包含文字空间，并且必须进行编码；从语义上讲，%20 不是空格(显然)但它代表一个空格.

But whether the statement is right or wrong depends on the interpretation: Syntactically, a URI must not contain a literal space and it must be encoded; semantically, a %20 is not a space (obviously) but it represents a space.

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