code: function(name, url, params, options) {
          OpenLayers.Layer.prototype.initialize.apply(this, [name, options]);
          this.url = url;
          if (!this.params) {
              this.params = OpenLayers.Util.extend({}, params);
          }
      }
docs: Constructor: OpenLayers.Layer.HTTPRequest
  
  Parameters:
  name - {String}
  url - {Array(String) or String}
  params - {Object}
  options - {Object} Hashtable of extra options to tag onto the layer