[1] [CITE[TCP Keepalive HOWTO]]
([TIME[2007-05-04 22:26:59 +09:00]] 版)
<http://www.tldp.org/HOWTO/html_single/TCP-Keepalive-HOWTO/>


[2] [CITE[Issue 401142 - chromium - on android some requests take in the order of minutes before reporting an error - An open-source project to help move the web forward. - Google Project Hosting]]
([TIME[2015-09-27 20:06:58 +09:00]] 版)
<https://code.google.com/p/chromium/issues/detail?id=401142>

[3] [CITE[curl - How To Use]]
([TIME[2020-09-21T09:01:13.000Z]], [TIME[2020-10-01T06:19:43.681Z]])
<https://curl.haxx.se/docs/manpage.html#--keepalive-time>