PUT request fails with HTTP error 400

[jamiebullock]

I have an authenticated session, which I can successfully make GET requests to the Basecamp API.

If I send a PUT request with:

r = session.put('https://3.basecampapi.com/.../mydoc.json', data='{"title":"blah","content":"test"}', params={'format': 'json'})
print r.json()

Then I receive:

{u'status': 400, u'error': u'Bad Request'}

I have tried also sending data={"title":"blah","content":"test"} but get the same error.

I am able to successfully PUT to the endpoint using CURL, e.g.

curl -s -H "Authorization: Bearer s9s9sd" -H "Content-Type: application/json" \
  -d '{"title":"blah","content":"test"}' -X PUT  https://3.basecampapi.com/...mydoc.json