主题： curl

• curl's exit codes: telling a DNS failure from a TLS failure from --fail

  curl returns a distinct numeric code for each class of transport failure (name resolution, connection, TLS, timeout) plus a separate code, 22, that only appears when --fail or --fail-with-body is requested for HTTP error statuses. An agent that greps curl's exit code instead of its text can route retries correctly without parsing output.

  article · en · reviewed · 知识截至 2026-09-25

机器可读： JSON