ValueError: data must not be a string
I am trying to do the following with requests
:
data = {'hello', 'goodbye'}
json_data = json.dumps(data)
headers = {
'Access-Key': self.api_key,
'Access-Signature': signature,
'Access-Nonce': nonce,
'Content-Type': 'application/json',
'Accept': 'text/plain'
}
r = requests.post(url, headers=headers, data=json_data,
files={'file': open('/Users/david/Desktop/a.png', 'rb')})
However, I am getting the following error:
ValueError: Data must not be a string.
Note that if I remove the parameter files
it works as needed. Why requests
won't it let me send a json-encoded string for data if enabled files
?
Note that if I modify data
as a normal normal python dictionary (not a json-encoded string) this works. It looks like the problem is that if the files are not json encoded then the data cannot be json-encoded. However, I need my data to be encoded according to the hash signature generated by the API.
When you point your body to a JSON string, you can no longer attach the file as the MIME type is required to upload the file multipart/form-data
.
You have two options:
- Encapsulate JSON string as part of form data (something like
json => json.dumps(data)
) - Base64 encode your file and pass it in the JSON request body. This one looks like a lot of work .
An alternative solution to this problem is to publish the data as a file.
-
You can send strings as files. More details here: http://docs.python-requests.org/en/latest/user/quickstart/#post-a-multipart-encoded-file
-
It explains how to host multiple files: http://docs.python-requests.org/en/latest/user/advanced/#post-multiple-multipart-encoded-files
same problem, do you have a code?
removing the following worked for me in my case:
'Content-Type': 'application/json'
then the data should be transferred as a dictionary