HTTP标头中的SP Char？

Question

我一直在检查HTTP 1.1规范,我看到这样的事情:

Request-Line =方法SP Request-URI SP HTTP-Version CRLF

我知道这个Request-Line代表什么,但我想知道它SP代表什么？这是什么角色？

链接:http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1

编辑:

为了帮助以某种方式访问​​此页面的人,我在答复人提供的页面中找到了这套完整的代码:

OCTET          = <any 8-bit sequence of data>
CHAR           = <any US-ASCII character (octets 0 - 127)>
UPALPHA        = <any US-ASCII uppercase letter "A".."Z">
LOALPHA        = <any US-ASCII lowercase letter "a".."z">
ALPHA          = UPALPHA | LOALPHA
DIGIT          = <any US-ASCII digit "0".."9">
CTL            = <any US-ASCII control character
                 (octets 0 - 31) and DEL (127)>
CR             = <US-ASCII CR, carriage return (13)>
LF             = <US-ASCII LF, linefeed (10)>
SP             = <US-ASCII SP, space (32)>
HT             = <US-ASCII HT, horizontal-tab (9)>
<">            = <US-ASCII double-quote mark (34)>

它们变得很重要,因为它们被用来购买规范来解释标题的格式以及许多其他的东西.

Answer 1

SP = US-ASCII SP,空格(32)

来源http://www.w3.org/Protocols/HTTP/1.0/spec.html