code: def remote_addr(self):
          
          if not hasattr(self, "_remote_addr"):
              if self.app.config.PROXIES_COUNT == 0:
                  self._remote_addr = ""
              elif self.app.config.REAL_IP_HEADER and self.headers.get(
                  self.app.config.REAL_IP_HEADER
              ):
                  self._remote_addr = self.headers[
                      self.app.config.REAL_IP_HEADER
                  ]
              elif self.app.config.FORWARDED_FOR_HEADER:
                  forwarded_for = self.headers.get(
                      self.app.config.FORWARDED_FOR_HEADER, ""
                  ).split(",")
                  remote_addrs = [
                      addr
                      for addr in [addr.strip() for addr in forwarded_for]
                      if addr
                  ]
                  if self.app.config.PROXIES_COUNT == -1:
                      self._remote_addr = remote_addrs[0]
                  elif len(remote_addrs) >= self.app.config.PROXIES_COUNT:
                      self._remote_addr = remote_addrs[
                          -self.app.config.PROXIES_COUNT
                      ]
                  else:
                      self._remote_addr = ""
              else:
                  self._remote_addr = ""
          return self._remote_addr
docs: Attempt to return the original client ip based on X-Forwarded-For
          or X-Real-IP. If HTTP headers are unavailable or untrusted, returns
          an empty string.
  
          :return: original client ip.