Dulwich 0.19.6 synchronize issue

[metatoaster]

Seems like somewhere between dulwich-0.16.3 and 0.19.6 created an issue with our synchronize feature. These may also be caused in conjunction with the gzip settings that is present via the reverse proxy. Relevant traceback:

...
    Module dulwich.protocol, line 254, in read_pkt_seq
    Module dulwich.protocol, line 200, in read_pkt_line
    Module gzip, line 268, in read
    Module gzip, line 303, in _read
    Module gzip, line 197, in _read_gzip_header

IOError: Not a gzipped file 

Downgrading to some earlier version stopped this issue from occurring.