The Superstatic AJAX proxy lets you make requests to other domians without violating the Same-Origin Policy. For instance, you could mount a proxy called api that pointed to https://api.your-app.com. Once you've done so, a request to e.g. /__/proxy/api/users.json would be proxied through to https://api.your-app.com/users.json.

The configuration for superstatic-proxy is an object where the keys are reference names for the service to which you're proxying and configuration details. An example (comments for clarity despite JSON syntax):

{
  "api": {
    // the origin of the server to which you want to make requests
    "origin": "https://api.your-app.com",
    
    // set default headers present on every request. these can be
    // overridden on individual AJAX requests
    "headers": {
      "Accept": "application/json"
    },
    
    // if true, send the cookies from the static app along to the server
    "cookies": false,
    
    // set a timeout for requests sent to the proxy (defaults to 30 seconds)
    "timeout": 30
  }  
}