For the API rate limiting measurement project, the oauth_type information from the API is needed in webrequest.
For this to happen we need:
- MediaWiki of the API gateway to send a x-wmf-auth-type response header with the auth-type value (can also be done by adding the auth-type value in x_analytics header?)
- HAProxy to receive the header, pass it to the log for webrequest, and remove it from the response