python requests POST 400 error

Question

I've been looking to many questions similar to mine but I could not find a solution.

I'm using requests to perform a POST request. I've tried a lot of combinations inside the request but nothing returns a 201 ok.

Here is my code:

 import json
 import requests

 if __name__ == '__main__':

    headers = {'content-type' : 'application/json'}
    url = "http://myserver/ext/v3.1/test_device"
    message = {"atribute_a": "value", "atribute_b": "valueb"}
    params = {"priority":"normal"}

    r = requests.post(url, params=params, headers=headers, data = json.dumps(message) )
    print(r)

I've also tried withou json.dumps but it also gives me 400 bad request. I've also tried to add the params directly to the url like: ...?priority=normal but with no success.

Isn't there supposed to be a comma between params and headers in requests.post? — Gaurav Ojha
– Gaurav Ojha, Commented Apr 11, 2017 at 8:37
yes @GauravOjha of course. I tested with a comma. just a bad copy&past — lmbcerqueira
– lmbcerqueira, Commented Apr 11, 2017 at 8:43
Did you try to use data = message directly instead of json.dumps? — Gaurav Ojha
– Gaurav Ojha, Commented Apr 11, 2017 at 8:57
Yes @GauravOjha. I said that after my code but thanks for trying to help me — lmbcerqueira
– lmbcerqueira, Commented Apr 11, 2017 at 9:03
This probably has to do with how your server is processing this request. Can you show what kind of request is being expected by your server? — Gaurav Ojha
– Gaurav Ojha, Commented Apr 11, 2017 at 9:19

marcan2020 · Accepted Answer · 2019-03-25 21:28:35Z

19

The easiest technique is to use json instead of data as followed:

requests.post(url, headers=headers, params=params, json=data)

answered Mar 25, 2019 at 21:28

marcan2020

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Gaurav Ojha · Accepted Answer · 2017-04-11 10:27:05Z

9

Based on the comments, your server is actually expecting data as a stringified JSON object. As far as the params are concerned, it'd most probably help if they're declared as a tuple of tuples (or a dict of dicts)

Try the following -

headers = {
    'content-type': 'application/json',
}

params = (
    ('priority', 'normal'),
)

data = {
    "atribute_a": "value",
    "atribute_b": false
}

requests.post(url, headers=headers, params=params, data=str(data))

answered Apr 11, 2017 at 10:27

Gaurav Ojha

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