Features/config worker support and xhr channel support

[hthetiot]

Todo

• [x] Init worker
• [x] Add config worker
• [x] Send XHR to worker
• [x] Sync XHR from client via channel
• [x] Implement tests
• [x] Try common buffer format transferable for response (DISABLED)
• [x] Implement transferable Array buffer
• [x] Fix responseType arraybuffer in worker via native (test fail/disabled)
• [x] Add test end to end array buffer
• [x] Detect http2-cache location for default worker
• [x] Use worker by default if available
• [x] Piping logging over into the channel.
• [x] Add test-server ws/http1/http2 gzip support
• [x] Merge develop

Usage:

XMLHttpRequest.proxy({
        'transport': 'ws://localhost:7081/path',
        'worker': true, // bool to enable, string 'path to worker' or Worker instance
       // OR
        'worker': 'packages/http2-cache/dist/http2-cache.js'
        'proxy': [
            'http://cache-endpoint/',
            'http://localhost:7080/path/proxy',
        ]
    });

Test result

Reviewer note

Main commit is ece50afdab0170a83dd7629eedbcd8de01bc15e5 Previous commit to this one are in #88

configuration init worker handler

https://github.com/kaazing/http2-cache.js/blob/features/workerSupport/lib/configuration.js#L53

addConfig handler

https://github.com/kaazing/http2-cache.js/blob/features/workerSupport/lib/configuration.js#L339

sendViaChannel handler

https://github.com/kaazing/http2-cache.js/blob/features/workerSupport/lib/xhr.js#L413 https://github.com/kaazing/http2-cache.js/blob/features/workerSupport/lib/configuration.js#L459

Browser Support

Tested: Chrome, Firefox, Opera, Safari, IE.

Tests results

Test:

With gzip

npm run integration:worker

[dpwspoon]

This PR includes dist/ files. Please remove these. Follow up question, should the latest released dist/ file from the last release be on the develop branch? I would lean towards no, but I'm ok with it if that is better...

[hthetiot]

@dpwspoon Done

[hthetiot]

Need to fix failing test

Uncaught Failed to read the 'responseText' property from 'XMLHttpRequest': The value is only accessible if the object's 'responseType' is '' or 'text' (was 'json')

[hthetiot]

Need to fix karma tests

[dpwspoon]

@hthetiot Please change it to run in the worker by default (or confirm that it already does)

[dpwspoon]

Please see travis failures.

[dpwspoon]

We should consider piping/post-messaging the logging over into the main tab.

[hthetiot]

Note about gzip xhr support:

• https://gist.github.com/mamund/3490606

[hthetiot]

@jitsni Need to check with you for the possible related issue with encoding on http2.js

[hthetiot]

https://github.com/curl/curl/issues/661#issuecomment-184903489

[hthetiot]

Still having issues with gzip test-server using websocket + http2

[hthetiot]

@johnnykahalawai Merged with last http2-cache.js changes from develop.

@tejaede For testing you can use:

• https://github.com/kaazing/http2-cache.js/releases/tag/v0.2.11-beta

Note: Worker and ArrayBuffer enabled by default or can be disabled with this:

XMLHttpRequest.configuration.useTransferable = false;
XMLHttpRequest.configuration.useWorker = false;

More Example: https://github.com/kaazing/http2-cache.js/blob/features/workerSupport/integration-test/http2-worker-itest.js#L342

cc @dpwspoon

[dpwspoon]

LGTM