HTTP Referer not always being passed

Question

I have an application which records users visits. None of these visits are directly accessed, 100% of these visits are referred from another site.

I am passing

Answer 1

It is common when you are stuck finding why it is missing: - Sometime your referer is https and you are on http, it will be lost.

Otherwise: - User accessing by inputing url directly. - A user has bookmarked and come from bookmarks. - Sometime user keep the url default for browser (similar like bookmark) - Proxy surfying may remove referer. - accessing website as bots (search engine)