I'm not sure there is such a node for ROS, though I never searched for it myself. The guys from computer vision should be more able to inform you on that matter.
Some time ago I had the same problem so I developed some C++ code using libcurl
http://curl.haxx.se/ (non ROS related). I would have to look for it, but it should be fairly easy to wrap around ROS. However, I'm not an expert on this matter, probably libcurl is not the best option for solving this problem (I remember that frames were being grabbed at a really slow rate). Some cameras bring their own API which makes things easier, just wrap their API around a ROS node and it's all good! Lets see what other people suggest!