Why "standard_error_message" gets called?

Hello,

we have a standard_error_message which contains some static HTML and
additionally sets some non-caching-HTTP-headers.
Example:
<dtml-call "REQUEST.response.setHeader('Cache-Control', 'no-cache')">
<dtml-call "REQUEST.response.setHeader('Pragma', 'no-cache')">

In our site, I got a problem in some places of our site with caching,
because pages got non-caching-HTTP headers from anywhere. I found out,
that these headers got set by the standard_error_message. But the
affected pages get delivered without an error. I fixed this with a
workaround meanwhile, but the fact, that standard_error_message gets
called anywhere in the zms-process but does not show an error is still
there. I guess, it has something to do with recursive embedding links.

Do you have any idea about this?

Regards
PeterZ


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Tätigkeit eines ordnenden Wesens.", Hayek