Requested resources are unavailable

I have requested for data @ https://api.transport.nsw.gov.au/v1/publictransport/timetables/complete/transxchange
The response I received is like below:
<Buffer 50 4b 03 04 14 00 00 00 08 00 13 99 0f 49 e6 98 d3 60 d2 0d 00 00 0a 99 00 00 17 00 00 00 31 2f 6e 73 77 5f 31 2d 32 32 33 2d 5f 2d 73 6a 32 2d 31 2e ... >

How can I predict the data type(if it’s buffer or ZIP file)?