Android : MediaPlayer Seeking Back To Stream From An Http Url

I've been using androids MediaPlayer to stream from an http url and have a question about seeking. Currently, our urls expire after they have been used once or a certain time out has expired to dissuade scraping content. Now, this obviously makes progressive streaming past the buffer impossible with the exact same url as you need to open a new http connection with the same mangled key, which we intentionally don't allow.

However, MediaPlayer seems to do this when seeking before the current position (i.e. seeking from 1:00 in the audio to 0:30). As the file has already been downloaded up to the current position I'm confused as to why MediaPlayer is still trying to initate a new http connection in this case? The only thing I can think of is that MediaPlayer is getting rid of audio its already played up to the current position, and hence needs to restart the connection if you try to seek back on the stream. Is this correct, or is there something else going on?