URL 中存在空格？
w3fools 声明 URL 可以包含空格： http://w3fools.com/#html_urlencode
这是真的吗？ URL 如何包含未编码的空格？
我的印象是 HTTP 请求的请求行 使用空格作为分隔符，格式为{方法}{空间}{路径}{空间}{协议}：
GET /index.html http/1.1
那么URL怎么能包含空格呢？如果可以的话，用+替换空格的做法从何而来？
w3fools claims that URLs can contain spaces: http://w3fools.com/#html_urlencode
Is this true? How can a URL contain an un-encoded space?
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
Therefore how can a URL contain a space? If it can, where did the practice of replacing spaces with + come from?
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（4）
URL 不得包含文字空格。它必须使用 percent-encoding 或其他编码进行编码使用URL安全字符（例如application/x-www-form-urlencoded 使用
+而不是%20来表示空格）。但该说法正确还是错误取决于解释：从语法上讲，URI 不得包含文字空格，并且必须对其进行编码；从语义上讲，
%20显然不是空格，但它代表一个空格。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%20for spaces).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
%20is not a space (obviously) but it represents a space.他们确实是傻瓜。如果您查看 RFC 3986 附录 A，您会发现语法中根本没有提及“空格”用于定义 URL。由于语法中没有提及，因此对空格进行编码的唯一方法是使用百分比编码 (
%20)。事实上，RFC 甚至声明空格是分隔符，应该被忽略：
和
奇怪的是，RFC 中没有提到使用
+作为空格编码，尽管它被保留为子分隔符。我怀疑它的使用要么只是约定，要么由不同的 RFC（可能是 HTTP）涵盖。They are indeed fools. If you look at RFC 3986 Appendix A, you will see that "space" is simply not mentioned anywhere in the grammar for defining a URL. Since it's not mentioned anywhere in the grammar, the only way to encode a space is with percent-encoding (
%20).In fact, the RFC even states that spaces are delimiters and should be ignored:
and
Curiously, the use of
+as an encoding for space isn't mentioned in the RFC, although it is reserved as a sub-delimeter. I suspect that its use is either just convention or covered by a different RFC (possibly HTTP).空格只需替换为“%20”，例如：
http://www.example.com/my% 20美丽%20页
Spaces are simply replaced by "%20" like :
http://www.example.com/my%20beautiful%20page
我认为那里的信息部分正确：
正如您所指出的，URL 不能使用空格。 HTTP 请求将会被搞砸。我不确定
+是在哪里定义的，尽管%20是标准的。The information there is I think partially correct:
As you noted, an URL can NOT use spaces. The HTTP request would get screwed over. I'm not sure where the
+is defined, though%20is standard.