ESI within an img tag

[Ruslan Sivak]

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<img src='http://www.somesite.com/test.gif?random=<esi:include
src="/esi/random.pl"/>' alt="" height="1" width="1" />


This doesn't seem to get processed properly by varnish, but something like

<esi:include src="/esi/random.pl"/>


does get processed properly.  Is it because it's within a single quote?
 Is there a way of escaping things or something to get it to work the
way I want?

Russ
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