Add the referer information that could help you findout where's the link comes from.
[HttpKernel] tweaked previous commit
merged branch fabpot/referer-in-404 (PR #8708)

This PR was merged into the master branch.

Discussion
----------

Add the referer information that could help you findout where's the link comes from

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

#8218 rebased on master and slightly tweaked.

Commits
-------

8eb163d [HttpKernel] tweaked previous commit
bb5954e Add the referer information that could help you findout where's the link comes from.