Python send JSON using HTTP POST

Question

I need to send simple JSON using POST to webserver.

Now I'm using curl and it works:

curl -X POST -H "Content-Type: application/json" -H "Accept: application/json" -d '{"abc":123}' http://1.2.3.4:4321/api/test

How can I do it in python?

I wrote:

import urllib2
import json
from json import JSONEncoder

jsonString= JSONEncoder().encode({ 
   "abc": 123
})
print 'JSON: ', jsonString

url = 'http://1.2.3.4:4321/api/test'
req = urllib2.Request(url, jsonString)
response = urllib2.urlopen(req)
print response.read()

But it crash:

/usr/bin/python2.7 /tmp/rest.py
JSON:  {"abc": 123}
Traceback (most recent call last):
  File "/tmp/rest.py", line 50, in <module>
    registerNewDevice()
  File "/tmp/rest.py", line 33, in registerNewDevice
    response = urllib2.urlopen(req)
  File "/usr/lib/python2.7/urllib2.py", line 127, in urlopen
    return _opener.open(url, data, timeout)
  File "/usr/lib/python2.7/urllib2.py", line 410, in open
    response = meth(req, response)
  File "/usr/lib/python2.7/urllib2.py", line 523, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib/python2.7/urllib2.py", line 448, in error
    return self._call_chain(*args)
  File "/usr/lib/python2.7/urllib2.py", line 382, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.7/urllib2.py", line 531, in http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
urllib2.HTTPError: HTTP Error 400: Bad Request

Process finished with exit code 1

i would recommend using this: docs.python-requests.org/en/latest as urlib tends to be painful — user3012759
– user3012759, Commented Feb 13, 2015 at 12:22

dfranca · Accepted Answer · 2015-02-13 12:21:59Z

1

You are not passing the headers to Request You need at least specify the content-type (as you are doing when you call curl)

Would be something like this:

req = urllib2.Request(url, jsonString, {'Content-Type': 'application/json'})

answered Feb 13, 2015 at 12:21

dfranca

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