Missing Request Mime types about slacker HOT 2 OPEN

Hey @N-Schaef Mattermost have release a new version: 5.23.1 that fixes this issue.

Detail:
Modified the mime check, such that we now require Content-Type to be set in the request header.
This change was unintentional and led to breaking changes.

See issue: https://mattermost.atlassian.net/plugins/servlet/mobile?originPath=%2Fbrowse%2FMM-25677#issue/MM-25677

from slacker.

Hey just a heads up the fix is relatively trivial to implement if you get the time to implement and push upstream please review lines:

Set the headers in the post request: headers={'content-type': 'application/json'}, example change:

return requests.post(self.url, data=json.dumps(data),
                             timeout=self.timeout, proxies=self.proxies, 
                             headers={'content-type': 'application/json'})

from slacker.