Can http monitor use Keep-Alive?

Yes, and yes. To close the connection, you can use a send string like this:

 

 

GET /path/to/file.html\r\nHost: example.com\r\nConnection: close\r\n

 

 

Aaron

Is it correct in the following understanding?

 

 

Specifying "Connection:Keep-Alive" is efficient, because the connection established first keeps being used.

 

 

Sorry, I mis-read your original question. I know that the connection to the server can be kept open if the Connection: close isn't used, and that this can leave connections open for longer than necessary, but I don't know whether LTM would ever re-use it if it's still open. I'll try testing to see.

 

 

Aaron

Testing on 9.2.x, I see LTM selecting a new port regardless of the send string configuration, which I guess follows with the recommendation to use the Connection: close header to tell the server to close the TCP connection.

 

 

Aaron

Thanks for clarifying, Aaron.

 

 

It was my understanding as well that LTM would not re-use a monitor connection even if it was specified as a Keep-Alive connection.

 

 

Best practice is to specify either HTTP 1.0 or Connection: Keep-Alive to keep the connection to the server from remaining open longer than necessary.

 

 

/deb