Charles R Charles R - 1 year ago 484
JSON Question

Post JSON using Python Requests

I need to POST a JSON from a client to a server. I'm using Python 2.7.1 and simplejson. The client is using Requests. The server is CherryPy. I can GET a hard-coded JSON from the server (code not shown), but when I try to POST a JSON to the server, I get "400 Bad Request".

Here is my client code:

data = {'sender': 'Alice',
'receiver': 'Bob',
'message': 'We did it!'}
data_json = simplejson.dumps(data)
payload = {'json_payload': data_json}
r ="http://localhost:8080", data=payload)

Here is the server code.

class Root(object):

def __init__(self, content):
self.content = content
print self.content # this works

exposed = True

def GET(self):
cherrypy.response.headers['Content-Type'] = 'application/json'
return simplejson.dumps(self.content)

def POST(self):
self.content = simplejson.loads(

Any ideas?

Answer Source

As of Requests version 2.4.2 and onwards, you can alternatively use 'json' parameter in the call which makes it simpler.

>>> import requests
>>> r ='', json={"key": "value"})
>>> r.status_code
>>> r.json()
{'args': {},
 'data': '{"key": "value"}',
 'files': {},
 'form': {},
 'headers': {'Accept': '*/*',
             'Accept-Encoding': 'gzip, deflate',
             'Connection': 'close',
             'Content-Length': '16',
             'Content-Type': 'application/json',
             'Host': '',
             'User-Agent': 'python-requests/2.4.3 CPython/3.4.0',
             'X-Request-Id': 'xx-xx-xx'},
 'json': {'key': 'value'},
 'origin': 'x.x.x.x',
 'url': ''}

EDIT: This feature has been added to the official documentation. You can view it here: Requests documentation