This filter will process any incoming requests containing Range or If-Range headers and swallow all produced output except for that matching the requested range.
Range and If-Range readers allow partial downloading of resources in cases such as media playback or large downloads pause and resume. Google Chrome always send Range: bytes=0- when downloading a video, for instance.
RFP defines only byte ranges, however writers operate on characters which might be more then one byte long. We might be cutting the character in half at the boundary of range which might make some clients unhappy even tho they asked for it. Default value is true.