The request configuration of the request associated with this response.

class HttpResponseConfig {
 /**
  * The request's URL
  */
 String url;

 /**
  * The request params as a Map
  */
 Map params;

 /**
  * The header map without mangled keys
  */
 Map headers;

 var data;


 var _headersObj;

 /**
  * Header accessor.  Given a string, it will return the matching header,
  * case-insentivitively.  Without a string, returns a header object will
  * upper-case keys.
  */
 header([String name]) {
   if (_headersObj == null) {
     _headersObj = {};
     headers.forEach((k,v) {
       _headersObj[k.toLowerCase()] = v;
     });
   }

   if (name != null) {
     name = name.toLowerCase();
     if (!_headersObj.containsKey(name)) return null;
     return _headersObj[name];
   }

   return _headersObj;
 }

 /**
  * Constructor
  */
 HttpResponseConfig({this.url, this.params, this.headers, this.data});
}