logstash/logstash — pull request #346 by PriceChild (2013-02-04 11:14:26+00:00)
Title: Haproxy Request-URI may be absolute.

Absolute URI's are allowed and even required when communicating with a proxy: https://tools.ietf.org/html/rfc2616#section-5.1.2 Change to pattern should allow grok to match on this format.