[Python] Posting to API with cURL works while Python requests fails

I have a cURL command that works when uploading a file while the equivalent Python requests fails.

Here is the cURL command

curl -X POST "http://<DOMAIN>/polarion/rest/v1/projects/<PROJECT_ID>/workitems/<WORKITEM_ID>/attachments" \
-H "Authorization: Bearer <TOKEN>" \
-H "accept: application/json" \
-H "Content-Type: multipart/form-data" \
-F resource="{\"data\": [{\"type\": \"workitem_attachments\",\"attributes\": {\"fileName\": \"test.txt\",\"title\": \"test\"}}]}" \
-F files=@"test.txt"


And here is the Python

import requests
import json

url = "http://<DOMAIN>/polarion/rest/v1/projects/<PROJECT_ID>/workitems/<WORKITEM_ID>/attachments"

headers = {
"Content-Type": "multipart/form-data",
"accept": 'application/json',
"Authorization": "Bearer " + token
}

data = {
"data": [
{
"type": "workitem_attachments",
"attributes": {
"fileName": "test.txt",
"title": "test"
}
}
]
}

files = {
'resource': (None, json.dumps(data)),
'files': ("test.txt", open('test.txt', 'rb'))
}

r = requests.post(url, files=files, headers=headers)


While the cURL command works the Python fails with:

{"errors":[{"status":"400","title":"Bad Request","detail":null,"source":null}]}


I've compared the body for both from --trace-ascii and Request.prepare and they appear to be identical. Unless there is an encoding issue, I'm not sure what's wrong.

Here is the API reference: https://testdrive.polarion.com/pola...i-WorkItemAttachments-postWorkItemAttachments

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