docs: function getOperationResponseHeaders(operation) {
      var headers = [];
  
      if (operation) {
          _.each(operation.responses, function(response, responseCode) {
              // Convert responseCode to a numeric value for sorting ("default" comes last)
              responseCode = parseInt(responseCode) || 999;
  
              _.each(response.headers, function(header, name) {
                  // We only care about headers that have a default value defined
                  if (header.default !== undefined) {
                      headers.push({
                          order: responseCode,
                          name: name.toLowerCase(),
                          value: header.default
                      });
                  }
              });
          });
      }
  
      return _.sortBy(headers, 'order');
  }