The edge's intro from nathanwdavis

edge's Introduction

Edge

Edge is a lightweight edge server for a CDN that runs on Node. It has no dependencies (other than Node) is quite simple to use:

 var edge = require('Edge');
 var edge_server = edge.createServer({host: 'nodejs.org'});

This simple configuration will reverse proxy, then cache all responses keyed on the request URL.

Additional options:

 var edge_server = edge.createServer({host: 'nodejs.org', 
                                      port: 80,
                                      pathPrefix: '/docs/v0.4.7/api/assets',
                                      defaultMaxAge: 60*60*48 });

You can also just use directly from the command line (equivalent to above:

 > node lib/edge-server.js nodejs.org 80 /docs/api/v0.4.7/api/assets 172800

Edge supports the following common features:

Expires cached assets based on the Expires or Cache-Control headers of the origin request.
Correctly uses client request headers to respond with 304 if possible
Sets Cache-Control to a default if origin response doesn't have Cache-Control or Expires header
Cookieless
Simultaneous requests for the same cache missed asset will not result in multiple origin server requests. Each request will listen on the response of one single origin server request.

More: For more info on CDNs, Node, and why I built this see these presentation slides: https://docs.google.com/present/view?id=dggt936r_21gg4kc7f6

Note: This project has not been battle-tested. It is not production-ready.... yet.

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