Not able to call post method using python requests library when using headers

Question

I am new to Python. I am using 'requests' library to send post request. I am able to send post request without headers but when giving headers I am getting HTTP 400 error.

import requests

API_ENDPOINT = "https://reqres.in/api/users"

data = {"name": "Name1", "job": "job1"}
headers = {'Content-Type': 'application/json'}

# sending post request and saving response as response object
full_output = requests.post(url = API_ENDPOINT, headers=headers,  data = data)
print("response status", full_output.status_code)
print("response", full_output.text)

Output:

response status 400

response <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Error</title>
</head>
<body>
<pre>Bad Request</pre>
</body>
</html>

It is working if I pass empty headers in the code

headers = {}

Not sure why it is not working. Request your help. Thanks.

try json=data or you need to dump your data dict to JSON first before if you use that json string with data=. Note that json=data will set the headers Content-Type for you, so you can skip that as well. — buran
– buran, Commented Jun 27, 2022 at 8:15
Does this answer your question? Difference between data and json parameters in python requests package — buran
– buran, Commented Jun 27, 2022 at 8:20
Hi @buran , yes after doing json=data it resolved my issue. Thank you for the suggestion. — Surya
– Surya, Commented Jun 27, 2022 at 9:12

Farshid · Accepted Answer · 2022-06-27 08:43:17Z

1

You are sending python dict where the api is expecting json string, to which you need to encode your dict. You can go for either of them:

full_output = requests.post(url = API_ENDPOINT, headers=headers,  data = json.dumps(data))

full_output = requests.post(url = API_ENDPOINT, json = data)

edited Jun 27, 2022 at 8:43

answered Jun 27, 2022 at 8:31

Farshid

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3 Comments

Surya Over a year ago

I have tried with the first one and it is working. Thanks.

Farshid Over a year ago

With 2nd approach, you don't have to set the content-type explicitly as it automatically sets Content-Type header to application/json, and also encodes the data to json

Surya Over a year ago

yes but I think I cannot use 2nd approach as I might have other headers as well apart from Content-Type. Say auth header, some custom header etc. I need to pass those headers.

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