[Typo3] 301 Moved Permanently

[Pierre Rossel]

Hello,

When publishing a new site version made with Typo3, we have the option to 
remove the old files from the web server... or not.

If removed, search engines like Google will get a 404 error and remove the 
page from the index. Or with Typo3, it will get the home page by default. 
I'm not sure of the consequences, but Google really don't like many urls 
that have the same content as it is considered as search engine spam.

If old pages are left in place, they will not be removed from search engines 
and visitors may miss the new content.

For this reason I once wrote a small php file to handle the 404 error, look 
up requested files in a CSV table and if found return a "HTTP/1.0 301 Moved 
Permanently" header along with the new page location. This is very valuable 
because search engines will replace old url by the new one and in the case 
of Google, transfer PageRank from the old page to the new page. Before the 
crawler updates the index, a google user clicking on the old url is 
automatically and transparently redirected to the new url.

Now the point is that I don't think my php file is compatible with Typo3 
with SimulateStatic link. Most urls are invalid and rewrited to index.php by 
the mean of .htaccess.

So my question is: how can I tell Typo3 that some old url sould return a 
"HTTP/1.0 301 Moved Permanently" heaer to update search engines instead of 
displaying the default home page ?

Thank you.
Pierre Rossel