* - maxfilesize: int, maximum file size that should be downloaded;
* has no effect, if the size of the requested entity is not known
* - lastmodified: int, timestamp for If-(Un)Modified-Since header
* - maxfilesize: int, maximum file size that should be downloaded;
* has no effect, if the size of the requested entity is not known
* - lastmodified: int, timestamp for If-(Un)Modified-Since header