Embodiments enable HTTP servers to pass incomplete andor corrupted files in response to file requests from clients. Rear wheel axles extend leftward and rearward from a final case supported by the rear portion of a body frame to independently suspend respective left and right rear wheels. The lever arm pivots about a fulcrum formed in the top member, and engages the link member. The heat sink can be formed on a front side and backside of the PCB and may have a plurality of posts for increasing the heat dissipating surface area of the heat sink.