编辑“︁帮助:CS1 errors”︁（章节）

==<span id="bad_url">Check |url= value</span>==
<section begin=bad_url_help_text />{{help desk}}<span class="error">Check <code style="color:inherit; border:inherit; padding:inherit;">|url=</code> value</span>

External links in {{cs1}} and {{cs2}} templates are made from two parts: the ''title'' ({{para|title}}, {{para|chapter}}, etc.) and the ''URL'' ({{para|url}}, {{para|archive-url}}, {{para|chapter-url}}, {{para|lay-url}}, etc.). The {{para|url}} parameter and other URL parameters must begin with a supported [[URI scheme]]. The URI schemes <code>http://</code>, <code>https://</code> and the protocol relative scheme <code>//</code> are most commonly used; <code>irc://</code>, <code>ircs://</code>, <code>ftp://</code>, <code>news:</code>, <code>mailto:</code> and <code>gopher://</code> are also supported.

The URL field is checked to ensure that it contains only Latin characters and does not contain spaces.  The URL may be protocol relative (begins with <code>//</code>).  If there are no spaces and the URL is not protocol relative, then the scheme must comply with <nowiki>RFC 3986</nowiki>.<ref>{{citation |mode=cs1 |contribution-url=http://tools.ietf.org/html/std66#section-3.1 |contribution=Scheme |title=Uniform Resource Identifier (URI): Generic Syntax |publisher=[[Internet Engineering Task Force]] |date=January 2005|rfc=3986}}</ref>  

Top- and second-level domain names are checked for proper form.  Generally, top-level domain names must be two or more letters; second-level domain names must be two or more letters, digits, or hyphens (first and last character must be a letter or digit).  [[Single-letter second-level domain]]s are supported for:
:all [[ccTLD]]s (the country code is not validated)
:the [[.org]] [[TLD]]
:certain letters of the [[.com]] TLD (q, x, z)
:certain letters of the [[.net]] TLD (i, q)
Third- and subsequent-level domain names are not checked.  The path portion of the URL is not checked.

To resolve this error, ensure that {{para|url}} and other URL parameters contain valid URLs.  Online tools are available to [[Internationalized domain name|internationalize]] URLs that are written in non-Latin scripts:
:{{cite web |url=http://mct.verisign-grs.com/ |title=IDN Conversion Tool |website=Verisign}}
:{{cite web |url=http://idna-converter.com/ |title=IDNA Conversion tool |website=IDNA-converter.com}}

Pages with this error are automatically placed in {{#ifeq: {{FULLPAGENAME}} | Category:Pages with URL errors | Category:Pages with URL errors | [[:Category:Pages with URL errors]]}}.<ref group="lower-alpha" name="categories" /><section end=bad_url_help_text />