server: better reverse proxy headers handling: reverse proxy header were not used if `X-Forwarded-Host` was not set, with this patch `X-Forwarded-Host` and `X-Forwarded-Proto` are check independently. Furthermore, the new standardised `Forwarded` header is not checked too. fix 396

import editor


editor.set_form_autosave("blog_post_edit")
editor.BlogEditor()
editor.TagsEditor("input[name='tags']")