CODEWITHSUNDEEP
pythonhttp-postpython-requests
Eli Rose
Eli Rose

Reputation: 6998

Why can't I send `None` as data in a POST request using Python's `requests` library?

It seems that when a key in data has a value of None, the key isn't included by requests.

>>> req = requests.Request('POST', 'http://google.com', data=dict(a=None, b=1))
>>> req.prepare().body
'b=1'

Why is this the case? I was expecting an empty string, or something like json.dumps(d) where None is rendered as null. I'm sure there's a good reason -- just curious about what it is. (One thing I can think of is that maybe there just isn't an encoding of null or None available to the POST request -- is that true?)

Additionally curious -- why does requests silently ignore such data instead of throwing an error?

Upvotes: 12

Views: 21804

Answers (4)

herve-guerin
herve-guerin

Reputation: 3101

The best way is to use parameter json instead of data. If you use :

requests.Request('POST', 'http://google.com', json=dict(a=None, b=1))

It works well

Upvotes: 0

Barmar
Barmar

Reputation: 781088

Setting a dictionary element to None is how you explicitly say that you don't want that parameter to be sent to the server.

I can't find this mentioned specifically in the requests.Request() documentation, but in Passing Parameters in URLs it says:

Note that any dictionary key whose value is None will not be added to the URL's query string.

Obviously it uses consistent logic for POST requests as well.

If you want to send an empty string, set the dictionary element to an empty string rather than None.

Upvotes: 16

Sundeep Dangol
Sundeep Dangol

Reputation: 61

I had similar issue with a blank value and this was my workaround. I sent the data as json string and set content type headers as application/json. This seems to send the whole data across as expected. Took quite some time to figure out. Hope this helps someone.

import requests
import json

header = {"Content-Type":"application/json"}

data = {
    "xxx": None,
    "yyy": "http://",
    "zzz": 12345
    }

res = requests.post('https://httpbin.org/post', 
                    data=json.dumps(data), headers=header)

obj = json.loads(res.text)

print obj['json']

Upvotes: 6

Alberto Santos
Alberto Santos

Reputation: 41

I had the same question few days ago and if you replace data with json it should work for you, as now None will be sent in the body. 

request('POST', 'http://google.com', json=dict(a=None, b=1))

Upvotes: 3

Related Questions