ETag的语法？ [英] Syntax for ETag?

问题描述

Redbot 报告我的网页标题无效：

Redbot reports that my webpage has invalid header:

ETag标头的语法无效。

The ETag header's syntax isn't valid.

我的标题设置为：

ETag: 4ae413bd

为什么它无效？

ETag的语法是什么？

What is the syntax for an ETag?

推荐答案

尝试 ETag：4ae413bd。
ETag的价值必须遵循 ABNF 表格：

  entity-tag = [ weak ] opaque-tag
  weak       = "W/"
  opaque-tag = quoted-string

  quoted-string  = ( <"> *(qdtext | quoted-pair ) <"> )
  qdtext         = <any TEXT except <">>
  quoted-pair    = "\" CHAR
  CHAR           = <any US-ASCII character (octets 0 - 127)>
  TEXT           = <any OCTET except CTLs, but including LWS>
  OCTET          = <any 8-bit sequence of data>
  LWS            = [CRLF] 1*( SP | HT )
  CTL            = <any US-ASCII control character (octets 0 - 31) and DEL (127)>
  CRLF           = CR LF
  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)>

，基本上是（[wW] /）？（[^ 常规正则表达式中的] | \\）*。

, which is basically ([wW]/)?"([^"]|\\")*" in regular regex.

请注意，两者都是\和/是etags的有效值。

Note that both "\" and "/" are valid values for etags.

参考文献： section-14.19 ， section-3.11 ， section-2.2 。

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