Persistent vs non persistent connections

Question

I am trying to verify which type of connection is being made - persistent or non persistent. I see the following and if someone could explain what each of these mean

Keep-Alive: 300 
Connections:keep-alive
Keep-Alive: timeout=max=100

Answer 1

If this is exactly what was in the trace file, the connection will not be persistent as the headers are not correct. The correct header would be:

Connection: keep-alive

Please note that:

In HTTP/1.0 the connection is non-persistent by default unless you add the "Connection: keep-alive" header in the http request. After that, it is up to the server to choose whether to use a persistent connection or not
In HTTP/1.1 the connection is persistent by default unless you add the "Connection: close" header to the http request. In which case the server has to close the connection the requested object has been sent.