how to check connection is closed by server or server supports keep alive?

how can I check that server supports keep-alive ? I want to check this by analyzing http response.

I am using mongoose c++ server. and I am 开发者_如何学编程setting header keep-alive. But I doubt it is closing the connection. As it is always taking time required to connect to host from client. I doubt connection is getting close.

How I can check that connection is getting closed or not ?

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The "close" takes place on the TCP level - so IMHO the most relaibale place to check for it is the network level - you can check that by using Fiddler or Wireshark...