WIP: Add support for sending event requests via proxy

[ndmanvar]

Do not merge...just yet.

[ndmanvar]

usage / test script:

var Raven = require('raven');
Raven.config('https://{PUBLIC_KEY}:{SECRET_KEY}@sentry.io/202440', {
    transport: new Raven.transports.HTTPSProxyTransport({
        proxyHost: 'localhost',
        proxyPort: 8080,
    })
}).install();

var x = {};
x.something();

http in URL -> HTTPProxyTransport
https in URL -> HTTPSProxyTransport

[mfpierre]

@ndmanvar I think you're missing setting the Host header to be set to client.dsn.host in case of proxy.
Without it the host header would keep the proxy host which cause the HTTP request to be rejected by the sentry.io server

[ndmanvar]

https://gist.github.com/ndmanvar/7ae7b4db7bf1cda30545c1480fde77fe

Works with https.
Host CustomTransport.js along with code, reference from Raven:

var Raven = require('raven');
var CustomTransport = require('./CustomTransport.js');

Raven.config('https://{PUBLIC_KEY}:{PRIVATE_KEY}@sentry.io/{PROJECT_ID}', {
    transport: new CustomTransport.HTTPSProxyTransport()
}).install();

var x = {};
x.something();

[ndmanvar]

Gist is the current workaround.

[ndmanvar]

Closed this, as I am working off of new branch: #397