Category:CS1 errors: URL

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This is a tracking category forCS1 citationsthat haveURI schemeerrors.

Help desk

External links inCitation Style 1andCitation Style 2templates are made from two parts: thetitle(|title=,|chapter=,etc.) and theURL(|url=,|archive-url=,|chapter-url=,etc.). The|url=parameter and other URL parameters must begin with a supportedURI scheme.The URI schemeshttp://,https://,and the protocol relative scheme//are most commonly used;irc://,ircs://,ftp://,news:,mailto:andgopher://are also supported.

The URL scheme and host are checked to ensure that they contain only Latin characters, certain (required) punctuation, and do not contain spaces. The URL may be protocol relative (begins with//). If there are no spaces and the URL is not protocol relative, then the scheme must comply with RFC 3986.^[1]

Some URL domains are written with non-Latin characters. cs1|2 does not accept those kinds of URLs so they must be 'internationalized'. Online tools are available to internationalize URLs that are written in non-Latin scripts:

• "IDN Conversion Tool".Verisign.

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 domainsare supported for:

• allcc TLDs(the country code is not validated)
• the.orgTLD
• certain letters of theTLD (q, x, z)
• certain letters of the.netTLD (i, q)
• certain other TLDs (.cash, pany,.foundation,.media,.org,.today)

Third- and subsequent-level domain names are not checked. The path portion of the URL is not checked.

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

To resolve this error, ensure that:

• |url=and other URL parameters contain valid URLs
• URLs copy-pasted from elsewhere include the URI scheme
• that the domain name uses only Latin characters

Pages with this error are automatically placed in Category:CS1 errors: URL.^[a]