[vbox-dev] vboxweb.cpp patch for HTTP keep-alive

[Ian Moore]

Hello,

The attached patch adds HTTP keep-alive support to vboxwebsrv.

When working on a web interface for VirtualBox, I found a lot of sockets on
the vboxwebsrv end are left in TIME_WAIT for quite a while. This takes up
system resources and can cause vboxwebsrv to use all of its allotted open
files on *nix systems. This is not "wrong," but can be somewhat alleviated.
With this patch I went from hundreds of connections left in TIME_WAIT to 0.

By default, each object property accessed by a web service is a separate TCP
connection to vboxwebsrv. When obtaining.. say .. a list of VMs and their
properties, this is a lot of connections. With HTTP keep-alive enabled in
gSOAP, all SOAP requests go through the same, existing HTTP connection. This
keeps the amount of socket connections to a minimum.

In accordance with VirtualBox's contributor information: The attached patch
is submitted under the MIT license.

Thank you for your time.
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