what significance has Connection :"keep-alive" in response headers

In a web application i saw the following in response headers :
Connection :"keep-alive"
I want to mimic it and thinking of adding the following to my spring mvc code :
        response.setHeader("Connection", "keep-alive");
Does it make any difference whether i pass that in header or not ?
What does it mean ?

Rohit BajajAsked:
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F IgorDeveloperCommented:
Conection: keep-alive means a request with a persistent connection.
The communication socket keeps alive for multiple requests
The common behavior is one connection-request-response. With keep alive, the  browser (client) can request multiple resources using a single connection socket.

When you send this header, the client (only if supports keep-alive)  tries to keep sending request using sonly one connection until the connection is closed,

See more details:
Rohit BajajAuthor Commented:
so it makes sense to send back keep alive in response only if the request has keep alive ?
its like if the client has sent keep alive then it means it supports persistent connection and when we send it in response then a kind of approval is send which forces client to keep the connection open ?
is it possible to see it happenning in some open source browser code , just to get more familiar with concept?
F IgorDeveloperCommented:
Almost all modern http clients supports keep alive to boost performance

See the apache httpclient component and look for libraries or source code:

And check java technical documents about this topic like:

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