How to send a POST request as JSON?

Question

data = { 'ids': [12, 3, 4, 5, 6 , ...] } urllib2.urlopen("http://abc.com/api/posts/create",urllib.urlencode(data)) 

I want to send a POST request, but one of the fields should be a list of numbers. How can i do this? (JSON?)

Answer 1

If your server expects the POST request to be json, you need to add a header as well as serialize the data for your request ...

Python 2.x

 import json import urllib2 data = { 'ids': [12, 3, 4, 5, 6] } req = urllib2.Request('http://example.com/api/posts/create') req.add_header('Content-Type', 'application/json') response = urllib2.urlopen(req, json.dumps(data)) 

Python 3.x

stack overflow

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If you do not specify a title, this will be the default type application/x-www-form-urlencoded .

Answer 2

I recommend using the incredible requests module.

http://docs.python-requests.org/en/v0.10.7/user/quickstart/#custom-headers

 url = 'https://api.github.com/some/endpoint' payload = {'some': 'data'} headers = {'content-type': 'application/json'} response = requests.post(url, data=json.dumps(payload), headers=headers) 

Answer 3

for Python 3.4.2 I found the following will work:

 import urllib.request import json body = {'ids': [12, 14, 50]} myurl = "http://www.testmycode.com" req = urllib.request.Request(myurl) req.add_header('Content-Type', 'application/json; charset=utf-8') jsondata = json.dumps(body) jsondataasbytes = jsondata.encode('utf-8') # needs to be bytes req.add_header('Content-Length', len(jsondataasbytes)) print (jsondataasbytes) response = urllib.request.urlopen(req, jsondataasbytes) 

Answer 4

This works great for Python 3.5 if the URL contains a Query String / Parameter value,

Request URL = https://bah2.com/ws/rest/v1/concept/
Parameter Value = 21f6bb43-98a1-419d-8f0c-8133669e40ca

 import requests url = 'https://bahbah2.com/ws/rest/v1/concept/21f6bb43-98a1-419d-8f0c-8133669e40ca' data = {"name": "Value"} r = requests.post(url, auth=('username', 'password'), verify=False, json=data) print(r.status_code) 

Answer 5

You need to add a header, or you will get an http 400 error. The code works well on python2.6, centos5.4

the code:

  import urllib2,json url = 'http://www.google.com/someservice' postdata = {'key':'value'} req = urllib2.Request(url) req.add_header('Content-Type','application/json') data = json.dumps(postdata) response = urllib2.urlopen(req,data) 

Answer 6

Here is an example of how to use the urllib.request object from the Python standard library.

 import urllib.request import json from pprint import pprint url = "https://app.close.com/hackwithus/3d63efa04a08a9e0/" values = { "first_name": "Vlad", "last_name": "Bezden", "urls": [ "https://twitter.com/VladBezden", "https://github.com/vlad-bezden", ], } headers = { "Content-Type": "application/json", "Accept": "application/json", } data = json.dumps(values).encode("utf-8") pprint(data) try: req = urllib.request.Request(url, data, headers) with urllib.request.urlopen(req) as f: res = f.read() pprint(res.decode()) except Exception as e: pprint(e)