Editing Help:CS1 errors (section)

==<span id="bad_url">Check |url= value</span>==
<section begin="bad_url_help_text" />{{help desk}}{{#invoke:Cs1 documentation support|help_text_error_messages|err_bad_url|$1=<code class="cs1-code">{{pipe}}url=</code>}}

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 [[Country code top-level domain|cc TLD]]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.

{{#invoke:Cs1 documentation support|help_text_error_messages|err_bad_url|$1=<code class="cs1-code">{{pipe}}archive-url=</code>}}

The cs1|2 templates expect that {{para|archive-url}} will hold a unique URL for an archived snapshot of the source identified by {{para|url}} or {{para|chapter-url}} (or any of its aliases).  This error message is emitted when the value assigned to {{para|archive-url}} is the same as the matching title or chapter URL.  

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=https://www.verisign.com/en_US/channel-resources/domain-registry-products/idn/idn-conversion-tool/index.xhtml?loc=en_US |title=IDN Conversion Tool |website=Verisign }}

Pages with this error are automatically placed in {{#invoke:cs1 documentation support|help_text_cats|err_bad_url|pages=yes}}.<ref group="lower-alpha" name="categories" /><section end="bad_url_help_text" />