Forum Moderators: phranque
You will almost always want to use [R] in conjunction with [L] (that is, use [R,L]) because on its own, the [R] flag prepends [thishost[:thisport]...] to the URI, but then passes this on to the next rule in the ruleset, which can often result in 'Invalid URI in request' warnings.
(emphasis mine)
If no code is given a HTTP response of 302 (MOVED TEMPORARILY) is used. If you want to use other response codes in the range 300-400 just specify them as a number or use one of the following symbolic names: temp (default), permanent, seeother.