In case of JIRA/Confluence I was able to do this configuring the server.xml's http connector adding redirectport=443 and ssl connector adding proxyname="confluence.mydomain.net" to it which did the job, but I don't know how to do any similar to fisheye's config.xml.
I'm sorry but unfortunately is not possible to auto-redirect from http to https in FishEye. This configuration needs to be done directly in your proxy.
I've found some documents I think that might be helpful.
In this document, please take a look at David Hergert's comment and its replies.
There is also an improvement request at https://jira.atlassian.com/browse/FE-3920with some discussion about this feature in its comments. This comment contained in its comments might be useful for you, but please notice this configuration is unsupported, as stated by Tom Davies in the next comment.
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