Find out why rate-limiting is not working correctly

[bartjkdp]

This makes sure rate-limiting is being applied as designed, e.g. by using memcache backend. After releasing the new release the following errors occured. In the logs requests are blocked with status code 429:

Rate-limiting should not occur as requests are private endpoints and from logged in users.

Possible explanations:

• The original IP is not determined correctly (check if we pass X-Forwarded-For correctly).
• Logged in user is not determined correctly.

[bartjkdp]

@CBuiVNG is fixing this in Amsterdam#819