http 协议的有效字符

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已于 2025-06-10 15:10:49 修改 · 601 阅读

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#http #网络协议 #网络

于 2024-03-20 16:04:43 首次发布

最近在研究请求头、响应头的有效字符，首先看看 rfc2616 关于消息头的定义：

RFC2616 4.2 Message Headers

beyond the common forms.

       message-header = field-name ":" [ field-value ]
       field-name     = token
       field-value    = *( field-content | LWS )
       field-content  = <the OCTETs making up the field-value
                        and consisting of either *TEXT or combinations
                        of token, separators, and quoted-string>

这个是关于消息头的语法定义，其中一些细节在标准的2.2 Basic Rules内定义如下：

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)>
CRLF           = CR LF
LWS            = [CRLF] 1*( SP | HT )
OCTET          = <any 8-bit sequence of data>
CHAR           = <any US-ASCII character (octets 0 - 127)>
CTL