file - HTTP 路径必须以斜杠开头吗？

Question

我有一个关于 HTTP 格式的问题。 HTTP 请求的第一行看起来像这样:

GET /path/to/resource.txt HTTP/1.1

或者换句话说:

METHOD URI HTTP-VERSION

是否要求 URI 以 / 字符开头，以便 /path/to/resource.txt 与path/to/resource.txt 两者都有效吗？

如果不需要前导 /，GET/HTTP/1.1 和 GET HTTP/1.1 也一样吗？ (GET 和 HTTP/1.1 之间的两个空格)

Answer 1

参见 RFC 7230, section 5.3 Request target :

Once an inbound connection is obtained, the client sends an HTTPrequest message (Section 3) with a request-target derived from thetarget URI. There are four distinct formats for the request-target,depending on both the method being requested and whether the requestis to a proxy.

request-target = origin-form

                / absolute-form
                / authority-form
                / asterisk-form

你说的是原始形式，在 subsection 5.3.1 中有描述。 :

When making a request directly to an origin server, other than aCONNECT or server-wide OPTIONS request (as detailed below), a clientMUST send only the absolute path and query components of the targetURI as the request-target. If the target URI's path component isempty, the client MUST send "/" as the path within the origin-form ofrequest-target. A Host header field is also sent, as defined inSection 5.4.

For example, a client wishing to retrieve a representation of theresource identified as

http://www.example.org/where?q=now

directly from the origin server would open (or reuse) a TCPconnection to port 80 of the host "www.example.org" and send thelines:

GET /where?q=now HTTP/1.1

 Host: www.example.org

并且“绝对路径”在section 2.7 中定义得较早作为

 absolute-path = 1*( "/" segment )

所以是的，一些目标标识符是必需的，路径总是以斜杠为前缀，如果未知、为空或不适用，则为 /。