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URL
This documents research and notes around URLs for the URL standard.
Implementations
- http://trac.webkit.org/browser/trunk/Source/WebCore/platform/KURL.cpp
- http://trac.webkit.org/browser/trunk/Source/WebCore/platform/KURLWTFURL.cpp
- http://trac.webkit.org/browser/trunk/Source/WebCore/platform/KURLGoogle.cpp
- http://trac.webkit.org/browser/trunk/Source/WebCore/platform/network/DataURL.cpp (data URLs)
- http://mxr.mozilla.org/mozilla-central/source/netwerk/base/src/nsStandardURL.cpp
- http://mxr.mozilla.org/mozilla-central/source/dom/src/jsurl/nsJSProtocolHandler.cpp (javascript URLs)
- http://mxr.mozilla.org/mozilla-central/source/nsprpub/pr/src/misc/prnetdb.c#1544 (IPv6)
Tests
Variants of the following code (runs in Live DOM Viewer) are useful to test which code points are URL escaped in browsers:
<!DOCTYPE html>
<script>
var a = document.createElement("a")
i = 0
cp = 0x100
while ( i < cp ) {
a.href = "http://x" + String.fromCharCode(i) + "@x/"
if(a.href.length != "http://x)@x/".length) {
w(a.href)
}
i++
}
</script>
Parsing
- https://github.com/annevk/url/blob/master/url.js
- http://lists.w3.org/Archives/Public/public-whatwg-archive/2012Sep/0305.html has notes on file URLs in Gecko.
JavaScript libraries
For improving the API we might want to take inspiration from:
- http://medialize.github.com/URI.js/
- https://github.com/joyent/node/blob/master/doc/api/url.markdown
- https://github.com/bestiejs/punycode.js (just Punycode)
Schemes
Currently the parser does not separate out query, this could be problematic for about and maybe mailto.
- data
- javascript
- mailto
- about (uselessly defined in RFC 6694)
IDNA
IDNA2003 below is IDNA2003 with updated Unicode (in theory IDNA2003 restricts Unicode to 3.2?)
- Opera: http://www.alvestrand.no/pipermail/idna-update/2012-November/007455.html (IDNA2008 + deviations); email does not mention domain label separators or fullwidth mapping, presumably http://tools.ietf.org/html/rfc5895#section-2 is implemented too (though not entirely, see label separators)
- Firefox: IDNA2003
- https://bugzilla.mozilla.org/show_bug.cgi?id=479520 (implement IDNA2008)
- Safari/Chrome: IDNA2003
- Internet Explorer: ?
- http://mathias.html5.org/tests/url/idna2003-separators/ IDNA2003 domain label separators are supported everywhere
- Browsers have no restrictions in the ASCII range either. E.g. labels with underscores work.
What algorithms do we need. ToLabels(domain string) -> list of labels (trailing dot) or failure. ToASCII(label) -> ASCII-label. ToUnicode(label) -> Unicode label. ToLabels should do validation and such too. ToASCII and ToUnicode ideally never fail because ToLabels already ensured validity.