OAuth2Session Google API example note documentation

Please add or note in the documentation examples 
how passing request body as json than data parameter ( .post(json=) instead of .post(data=)  )
for a HTTP post call via OAuth2Session ( Session ' s request )  's required for Google APIs . 

Reference - 
Calendar API example at 
https://stackoverflow.com/questions/29714710/google-calendar-api-freebusy-jquery-post-gets-400-bad-request-error