timeout and keepalive parameter in ProxyPass

[Usha Nayak <ushanay@xxxxxxxxx>]

Hello

Need help in understanding the highlighted parameters:

ProxyPass "/example" "http://backend.example.com"  timeout=3600 keepalive=On

keepalive parameter - As I understand relates to TCP or socket keep alive probes that are sent to prevent idle connection. 

My confusion is :

Assuming the backend server takes 4 hrs to process a request and I have 'keepalive on' in Apache httpd with the OS setting to send tcp probes every 2 minutes. Backend server and Apache httpd are sending TCP keep alive packets to indicate the socket connection is not idle.

•  In this case, would the 'apache httpd' close the connection in 1 hr ( timeout = 3600) because the 'apache httpd' didn't get the http data? Is this timeout  'apache httpd' application timeout ? 

Appreciate help.

Thanks.