Issues with posting data to MongoDB via taxii server (medallion)

Question

I am using medallion implementation of taxii (https://github.com/oasis-open/cti-taxii-server) to connect with OTX (https://github.com/AlienVault-OTX/OTX-Apps-TAXII). However, I seem to be getting this error on the taxii server.

127.0.0.1 - - [13/Jun/2018 11:25:57] "POST /taxii HTTP/1.1" 405 -

Here's my configuration file

server_ip=127.0.0.1:5000
username=admin
password=Password01
discovery_path=/taxii/
collection_name=alienvaultotx
uri=/taxii/

Any idea how to fix this problem?

Thanks