if captions.endswith(STL_EXT):
captions = captions[:-len(STL_EXT)] + SRT_EXT
subtitles['it'] = 'http://www.rai.tv%s' % compat_urllib_parse.quote(captions)
if captions.endswith(STL_EXT):
captions = captions[:-len(STL_EXT)] + SRT_EXT
subtitles['it'] = 'http://www.rai.tv%s' % compat_urllib_parse.quote(captions)