doc, SSI is as the name says, server side.
thus, to get the real source, you need to get access to the original ssi document which tells where it loads the source from.
and thus, you can't get it from web unless the server is misconfigured...
for not executing the SSI but showing it.
and another thing...
having SSI source in web viewable location kinda takes out some of the meaning of it.
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