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http proxy should be able to: termination https connections (use http to internal servers)
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link translation (replace internal links from the https servers)
You can do these two tasks with Apache. Just use the proxy and rewriting modules to fetch the pages from the internal servers. There is a module to rewrite internal links IIRC, but I prefer to use the canonical name for the internal servers too and access them through an alias. This way the internal servers produce the correct links right from the start without need for output filtering.
Ralf Döblitz -- Ralf Döblitz asco GmbH Amtsgericht Braunschweig r.doeblitz@asco.de Mittelweg 7 HRB 5035 Tel 0531/3906-116 38106 Braunschweig Geschäftsführer Fax 0531/3906-400 http://www.asco.de Jochen Grote