原来RFC规定url是不准带下划线的

今天想在tencent的网站下载一个foxmail，发觉打开连接失败，提示如下：


ERROR
The requested URL could not be retrieved

--------------------------------------------------------------------------------

While trying to retrieve the URL: http://dl_dir.qq.com/foxmail/foxmail65beta02.exe

The following error was encountered:

Invalid URL
Some aspect of the requested URL is incorrect. Possible problems:

Missing or incorrect access protocol (should be `http://'' or similar)
Missing hostname
Illegal double-escape in the URL-Path
Illegal character in hostname; underscores are not allowed
Your cache administrator is sysadm@cse.cuhk.edu.hk.



--------------------------------------------------------------------------------

Generated Tue, 05 Aug 2008 14:17:54 GMT by pluto.cse.cuhk.edu.hk (squid/2.5.STABLE12)

仔细看，似乎是因为underscore的问题。

网上搜得出了这个答案：

出错的原因是你提到的这个域名有一个不称职的管理员。


RFC 1034中明确指出：

代码:  

The following syntax will result in fewer problems with many applications that use domain names (e.g., mail, TELNET).

<domain> ::= <subdomain> | " "

<subdomain> ::= <label> | <subdomain> "." <label>

<label> ::= <letter> [ [ <ldh-str> ] <let-dig> ]

<ldh-str> ::= <let-dig-hyp> | <let-dig-hyp> <ldh-str>

<let-dig-hyp> ::= <let-dig> | "-"

<let-dig> ::= <letter> | <digit>

<letter> ::= any one of the 52 alphabetic characters A through Z in upper case and a through z in lower case

<digit> ::= any one of the ten digits 0 through 9




下划线有保留意义，不能随意使用。

文章来自: 本站原创
引用通告: 查看所有引用 | 我要引用此文章
Tags: tencenttencent RFCRFC
相关日志: