Try this:
http://download.oracle.com/javase/1.5.0/docs/guide/net/http-keepalive.html
and this:
http://www.io.com/~maus/HttpKeepAlive.html
The salient points are:
0. 'Keep Alive' is really a connection cache.
1. 'Keep Alive' is default on Http 1.1 (and who remembers 1.0?)
2. 'Keep Alive' is basically a way that the server caches the connections for re-use to the client -
the operative word is cache. An idle connection will be painlessly recycled for you.
3.There is no specific Keep-Alive timeout - see 2. above.
Typically a given server can support 100+ connections - on Tomcat its a configuration setting - it
probably is in all the other app-servers (or at least it should be...) - an 'active' connection is
one that actually has data travelling across it, in one direction or another. A modern, high
capacity machine can support many more.
HTH
Alan
On 1/27/2011 1:59 PM, Richi Plana wrote:
On Thu, Jan 27, 2011 at 2:38 PM, Thomas Broyer <[email protected]
<mailto:[email protected]>> wrote:
That's HTTP: a request and a response, within a single TCP connection (and
using pipelining
and/or keep-alive, you could send multiple requests and receive their
responses all in a
single TCP connection).
The fact that it's asynchronous from your point of view (the code) is a
different thing.
This is what I meant by "keeping the persistent connection open". If multiple requests go on the
same TCP connection, how long is it kept alive? How many operations go over it before it is
disconnected? My concern is that a GWT application might require a persistent TCP connection with
the app server to the point that it hits a system maximum is users leave their application on even
though no activity is taking place.
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