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keepalive-time.md

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c: Copyright (C) Daniel Stenberg, daniel@haxx.se, et al. SPDX-License-Identifier: curl Long: keepalive-time Arg: Help: Interval time for keepalive probes Added: 7.18.0 Category: connection timeout Multi: single See-also:

  • no-keepalive
  • keepalive-cnt
  • max-time Example:
  • --keepalive-time 20 $URL ---

--keepalive-time

Set the time a connection needs to remain idle before sending keepalive probes and the time between individual keepalive probes. It is currently effective on operating systems offering the TCP_KEEPIDLE and TCP_KEEPINTVL socket options (meaning Linux, *BSD/macOS, Windows, Solaris, and recent AIX, HP-UX and more). Keepalive is used by the TCP stack to detect broken networks on idle connections. The number of missed keepalive probes before declaring the connection down is OS dependent and is commonly 8 (*BSD/macOS/AIX), 9 (Linux/AIX) or 5/10 (Windows), and this number can be changed by specifying the curl option keepalive-cnt. Note that this option has no effect if --no-keepalive is used.

If unspecified, the option defaults to 60 seconds.