code: function getEC2IAMRole(callback) {
  		httpRequest({host: EC2_METADATA_HOST, path: SECURITY_CREDENTIALS_RESOURCE}, null, function(error, role, httpResponse) {
  			callback(error, _.isString(role) ? role.trim() : role, httpResponse);
  		});
  	}
docs: Gets the EC2 IAM role name from the metadata service.
  
  @method getEC2IAMRole
  @private
  @param {Function} callback Callback function that receives the role returned by the metadata service.