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bounce HTTP requests around for load balancing or as an HTTP host router

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README.markdown

bouncy

Bouncy uses node's http parser innards to bounce http requests around to where they need to go in an entirely transparent way.

Use bouncy as a load balancer or http host router, either programmatically or with the simple command-line tool.

Bouncy is websocket and tls (https) capable.

trampoline

example

route.js

Route requests based on the host field

var bouncy = require('bouncy');

bouncy(function (req, bounce) {
    if (req.headers.host === 'beep.example.com') {
        bounce(8001).on('error', onerror);
    }
    else if (req.headers.host === 'boop.example.com') {
        bounce(8002).on('error', onerror);
    }

    req.on('error', onerror);
    function onerror () { req.destroy() }
}).listen(8000);

command-line

Just create a routes.json file like this:

{
    "beep.example.com" : 8000,
    "boop.example.com" : 8001
}

Then point the bouncy command at this routes.json file and give it a port to listen on:

bouncy routes.json 80

The routes.json file should just map host names to host/port combos. Use a colon-separated string to specify a host and port in a route.

Use "" for the host as a default route.

bouncy(opts={}, cb)

bouncy(cb) returns a new net.Server object that you can .listen() on.

If you specify opts.key and opts.cert, the connection will be set to secure mode using tls. Do this if you want to make an https router.

Your callback cb will get these arguments:

req

The node http module request object.

To catch parse errors, listen for the "error" event.

bounce(stream, opts={})

Call this function when you're ready to bounce the request to a stream.

The exact request that was received will be written to stream and future incoming data will be piped to and from it.

To send data to a different url path on the destination stream, you can specify opts.path.

You can specify header fields to insert into the request with opts.headers.

By default, "x-forwarded-for", "x-forwarded-port", and "x-forwarded-proto" are all automatically inserted into the outgoing header.

You can pass in an EventEmitter on opts.emitter to listen for "drop" events which occur when a .write() fails which happens with annoying frequency in node v0.4.x.

If you pass in an emitter you'll get the connection object on "drop" events so you can handle these yourself by writing an error message to the stream. If you don't pass in an opts.emitter, the connection will be .destroy()ed.

bounce() returns the stream object that it's using. This is useful if you pass in a port so you can .on('error', fn) to detect connection errors.

bounce(port, ...), bounce(host, port, ...), bounce(url)

These variants of bounce() are sugar for bounce(net.createConnection(port)) and bounce(net.createConnection(port, host)).

Optionally you can pass port and host keys to opts and it does the same thing.

Passing bounce() a string that looks like a url (with or without "http://") will set the opts.host, opts.port, and opts.path accordingly.

bounce.respond()

Return a new HTTP response object for the request. This is useful if you need to write an error result.

install

With npm, do:

npm install bouncy

to install as a library or

npm install -g bouncy

to get the command-line tool.

license

MIT/X11

jumping

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