- Fix CVE-2026-55717, 'serve-expired-client-timeout' and 'response-ip'

CNAME redirect could lead to a crash. Thanks to Qifan Zhang, Palo
  Alto Networks, for the report. In addition, thanks to Xin Wang,
  Jiapeng Li, and Jiajia Liu, Northwestern Polytechnical University,
  for also reporting this issue.