update httpclient dependency to ~>2.4.0

Change-Id: I6649655efd58136b949d0a72bb0e1db27986d729
spec: fix catalog specs

Change-Id: I92e6be291fcd555ba7c1dc7ce6dabaf4f72109fb
release: version 0.7.1

Change-Id: If9ba93efffe7fe52adbae692ce1fb5862e86b4e3