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Perform any connection upkeep checks.
|Component||Version||macOS||Windows||Server||FileMaker Cloud||FileMaker iOS SDK|
|curl||The CURL session handle.||$curl|
Returns OK or error.
DescriptionPerform any connection upkeep checks.
Some protocols have "connection upkeep" mechanisms. These mechanisms usually send some traffic on existing connections in order to keep them alive; this can prevent connections from being closed due to overzealous firewalls, for example.
Currently the only protocol with a connection upkeep mechanism is HTTP/2: when the connection upkeep interval is exceeded and CURL.Upkeep is called, an HTTP/2 PING frame is sent on the connection.
This function must be explicitly called in order to perform the upkeep work. The connection upkeep interval is set with CURL.SetOptionUpkeepIntervalMS.
Created 31st October 2018, last changed 31st October 2018
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