fix: defer loading of head.html to allow inclusion of request cookie #2275
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This fix changes the way how the remote head.html is loaded (the remote head.html version is needed to properly calculating how the local head.html needs to be injected into the html page).
instead of fetching the head.html during startup, it is deferred until the proxy server actually needs it. this is after the browser sent eventual request cookie. this allows that the remote head.html can be fetched also for authenticated sites.
fixes #2274