mediawiki redirect issue when nginx is behind varnish and listen to not 80

[Chris]

Hi

I hava migrated a mediawiki site to nginx server.Nginx listen to port 81
and is behind Varnish listen to 80.Varnish and Nginx on same server.Seems
like the configuration used for the Nginx wiki have a redirect issue.Visit
example.com index page will redirect to example:81.

Any ideas?
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