[TYPO3-core] RFC: pageNotFound_handling HTTP status fix

[Dmitry Dulepov]

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Hi!

This is a CVS patch request

Branch: HEAD

Problem: if $TYPO3_CONF_VARS['FE']['pageNotFound_handling'] is set to
absolute or relative URL, than
$TYPO3_CONF_VARS['FE']['pageNotFound_handling_statheader'] is ignored
and client is redirected to error page using code 302. This is
especially bad for search engines like Google because (1) they may not
remove such pages from their index (2) sitemaps do not work properly.

Solution: use cURL (if enabled in install tool) or fopen to fetch error
page internally and pass it to client with correct header. Pass correct
information about user agent and referrer.

Patch was asked by many people in the mailing lists in the past and
lately by Netcreators. So here it is.

Dmitry.
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