docs: def canned_handlers(self, environ, start_response, code = '200', headers = []):
          '''
          We convert an error code into
          certain action over start_response and return a WSGI-compliant payload.
          '''
          headerbase = [('Content-Type', 'text/plain')]
          if headers:
              hObj = Headers(headerbase)
              for header in headers:
                  hObj[header[0]] = '; '.join(header[1:])
          start_response(self.canned_collection[code], headerbase)
          return ['']