XMLHttpRequest should provided a futures based API

[jmesserly]

See these links for similar thing in Closure:
https://groups.google.com/forum/#!msg/closure-library-discuss/aHjKn7K6O9Q/kArNBi1NvDAJ
http://code.google.com/p/closure-library/source/browse/trunk/closure/goog/labs/net/xhr.js

We have one helper: "new XMLHttpRequest.get" that provides a callback API, but we should probably do something more substantial.

[iposva-google]

Removed Area-DOM label.
Added Area-HTML label.

[jmesserly]

see also jQuery's ajax method

[jmesserly]

Also, see angularjs $resource (example is on their homepage by "form validation")

     var Project = $resource('https://api.mongolab.com/api/1/databases' +
          '/angularjs/collections/projects/:id',
          { apiKey: '4f847ad3e4b08a2eed5f3b54' }, {
            update: { method: 'PUT' }
          }
      );

[sethladd]

See also issue #2677

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Added this to the Later milestone.

[sethladd]

See the http package for now: http://pub.dartlang.org/packages/http

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cc @munificent.

[munificent]

Unfortunately, the http package doesn't work browser-side yet. It's one of the many packages that's stuck waiting on platform-specific configuration. As soon as that's in the language, we do plan to support it in the browser as well as using dart:io.

[efortuna]

This should be fixed, yes? Reopen if we're missing something.

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Removed this from the Later milestone.
Added this to the M4 milestone.
Added Fixed label.