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URL schemes: Difference between revisions

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(→‎data: URLs: Add an example with a comma in a quoted string.)
(→‎about: URLs: Add html-kind)
 
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Licensing: this page is under CC0, not the MIT License.
{{CC0 page}}


== about: URLs ==
== about: URLs ==
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|  
|  
|-
|-
| "invalid"
| [https://drafts.csswg.org/css-values-3/#about-invalid "invalid"]
| -
| -
| Used to represent a network error. See also [http://dev.w3.org/csswg/css3-values/ CSS Values and Units].
| Used by CSS's url() function as a default value
|-
|-
| "legacy-compat"
| [https://html.spec.whatwg.org/#about:html-kind "html-kind"]
| -
| Used as an identifier for kinds of media tracks for HTML <audio> and <video> elements.
|-
| [https://html.spec.whatwg.org/#about:legacy-compat "legacy-compat"]
| -
| -
| Used in HTML for XSLT serializers.
| Used in HTML for XSLT serializers.
|-
|-
| "srcdoc"
| [https://html.spec.whatwg.org/#about:srcdoc "srcdoc"]
| -
| -
| Used in HTML for its <iframe srcdoc> feature.
| Used in HTML for its <iframe srcdoc> feature.
|-
| "unicorn"
| A resource whose Content-Type is image/svg+xml and entity body is the contents of [http://html5.org/temp/unicorn.svg unicorn.svg].
| Unicorn!
|}
|}


To '''obtain a resource''' from an about: URL, run these steps:
about: URLs are handled as [https://fetch.spec.whatwg.org/#scheme-fetch part of the Fetch Standard]; all but about:blank cause a network error. Cases like about:config can also make it to the fallback paths of HTML's [https://html.spec.whatwg.org/#navigate navigate] algorithm.
 
* If URL's scheme data is not the literal string "blank" or "unicorn", return a network error. (URL's query and URL's fragment are simply not taken into account and can be anything.)
* Return the resource corresponding to the identifier as listed in the table above, with HTTP status code 200 and HTTP status text "OK".


See also [http://tools.ietf.org/html/rfc6694 The "about" URI Scheme] and [http://www.iana.org/assignments/about-uri-tokens/about-uri-tokens.xml "about" URI Tokens] which this wiki page obsoletes.
See also [http://tools.ietf.org/html/rfc6694 The "about" URI Scheme] and [http://www.iana.org/assignments/about-uri-tokens/about-uri-tokens.xml "about" URI Tokens] which this wiki page obsoletes.
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== javascript: URLs ==
== data: URLs ==


'''javascript: URLs''' represent a JavaScript script.
See [https://fetch.spec.whatwg.org/#data-url-processor the Fetch Standard]


To '''obtain a script''' from a javascript: URL, run these steps:
== javascript: URLs ==
 
* Let ''input'' be the concatenation of URL's scheme data, followed by "?" and URL's query if URL's query is non-null, followed by "#" and URL's fragment if URL's fragment is non-null.
* Set ''input'' to the result of [http://url.spec.whatwg.org/#percent-decode percent decoding] ''input''.
* If ''input'' starts with a U+FEFF, remove a single occurrence from the start of ''input''.
* Return ''input''.
 
See also [http://tools.ietf.org/html/draft-hoehrmann-javascript-scheme The 'javascript' resource identifier scheme] which this wiki page obsoletes.
 
== data: URLs ==
 
To '''obtain a resource''' from a [http://url.spec.whatwg.org/#concept-parsed-url parsed URL] whose ''scheme'' is a ASCII case-insensitive match for "data:", run these steps:


* Set ''input'' to the URL’s [http://url.spec.whatwg.org/#concept-url-scheme-data scheme data].
'''javascript: URLs''' represent a JavaScript script. They are handled by the HTML Standard's [https://html.spec.whatwg.org/#javascript-protocol navigate algorithm].
* If the URL’s [http://url.spec.whatwg.org/#concept-url-query query] is not null, append "?" and the query to ''input''.
* If ''input'' does not contain a U+002C COMMA code point, return a network error. (Note: the comma can come either from the scheme data or the query.)
* Split ''input'' at the first comma. Set ''header'' and ''body'' to the parts before and after the comma, respectively. ('''Issue:''' what if the comma is an a MIME quoted string for a parameter value? Example: <code>data:text/plain;foo="bar,baz";charset=utf8,body</code>)
* Set ''body-bytes'' to the result of running ''percent decode to bytes'' on ''body''.
* If ''header'' ends with ";base64" ('''Issue:''' Match how strictly? Case sensitive or not? Allow whitespace? Percent-encoding?) then:
** Remove the matched substring from ''header''
** Decode ''body-bytes'' with the [https://tools.ietf.org/html/rfc4648#section-4 Base 64 Encoding]. ('''Issues:''' Also accept the ''URL and Filename Safe Alphabet''? Mixed alphabets in the same body? Ignore which non-alphabet bytes? Missing/too little/too much padding?)
* Return a response with ''header'' as a ''Content-Type'' header and ''body-bytes'' as the body. The parsing and interpretation of ''header'' must be the same as for an HTTP ''Content-Type'' header.


To '''percent decode to bytes''', run the same algorithm as '''[http://url.spec.whatwg.org/#percent-decode percent decode]''' but replacing the last step with "Return ''bytes''."
See also [http://tools.ietf.org/html/draft-hoehrmann-javascript-scheme The 'javascript' resource identifier scheme] which the HTML Standard obsoletes.


== Others ==
== Others ==

Latest revision as of 19:31, 11 August 2020

The contents of this page, URL schemes, and all edits made to this page in its history, are hereby released under the CC0 Public Domain Dedication, as described in WHATWG Wiki:Copyrights.

about: URLs

about: URLs serve as identifier, potentially with an associated resource. The identifier is given in the URL's scheme data.

Identifier Resource Notes
"blank" A resource whose Content-Type is text/html;charset=utf-8 and entity body is the empty string.
"invalid" - Used by CSS's url() function as a default value
"html-kind" - Used as an identifier for kinds of media tracks for HTML <audio> and <video> elements.
"legacy-compat" - Used in HTML for XSLT serializers.
"srcdoc" - Used in HTML for its <iframe srcdoc> feature.

about: URLs are handled as part of the Fetch Standard; all but about:blank cause a network error. Cases like about:config can also make it to the fallback paths of HTML's navigate algorithm.

See also The "about" URI Scheme and "about" URI Tokens which this wiki page obsoletes.

Examples

Input Result
about:blanK network error (uppercase K)
about:bl%61nk network error (no percent decoding by either the URL parser or the obtain a resource algorithm)
about:blank?teehee works (query does not matter)
about:blank?teehee#hihi works (fragment does not matter either)

data: URLs

See the Fetch Standard

javascript: URLs

javascript: URLs represent a JavaScript script. They are handled by the HTML Standard's navigate algorithm.

See also The 'javascript' resource identifier scheme which the HTML Standard obsoletes.

Others

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