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<h4 class="subsection">1.4.3 Poor Man's Multiplexing</h4>
<p><a name="index-Poor-Man_0027s-Multiplexing-13"></a><a name="index-multiplexing-14"></a>
A major weakness of the HTTP protocol is its inability to share a
single connection between multiple simultaneous transactions — to
<dfn>multiplex</dfn> a number of transactions over a single connection. In
HTTP, a client can either request all instances sequentially, which
significantly increases latency, or else open multiple concurrent
connections, with all the problems that this implies
(see <a href="Persistent-connections.html#Persistent-connections">Persistent connections</a>).
<p>Poor Man's Multiplexing (PMM) is a technique that simulates
multiplexing by requesting an instance in multiple segments; because
the segments are fetched in independent transactions, they can be
interleaved with requests for other resources.
<p>Obviously, PMM only makes sense in the presence of persistent
connections; additionally, it is only effective in the presence of
pipelining (see <a href="Pipelining.html#Pipelining">Pipelining</a>).
<p>PMM poses a number of reliability issues. If the resource being
fetched is dynamic, it is quite possible that it will change between
segments; thus, an implementation making use of PMM needs to be able
to switch to full-resource retrieval when it detects a dynamic
resource.
<p>Polipo supports PMM, but it is disabled it by default (see <a href="PMM.html#PMM">PMM</a>).
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