Features/config worker support and xhr channel support

[hthetiot]

Todo

• Init worker
• Add config worker
• Send XHR to worker
• Sync XHR from client via channel
• Implement tests
• Try common buffer format transferable for response (DISABLED)
• Implement transferable Array buffer
• Fix responseType arraybuffer in worker via native (test fail/disabled)
• Add test end to end array buffer
• Detect http2-cache location for default worker
• Use worker by default if available
• Piping logging over into the channel.
• Add test-server ws/http1/http2 gzip support
• 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 ece50af
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

[hthetiot]

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

[hthetiot]

curl/curl#661 (comment)

[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