How to upload file using json and files arguments in request.post method

Question

With Flask server:

from flask import Flask, request app = Flask(__name__) @app.route('/', methods=['GET', 'POST']) def index(): print('get_json: %s get_data: %s' % (type(request.get_json()), type(request.get_data())) ) return 'OK', 200 app.run('0.0.0.0', 80)

the Client sends a request using both json and files arguments:

import requests files_data = {"dirname/file,name": bytearray(4)} response = requests.post('http://127.0.0.1:80/', json = 'hello world', files = files_data)

the server prints that request.get_json() returns None.

get_json: <type 'NoneType'> get_data: <type 'str'>

How to pass hello world string to server?

Community · Accepted Answer · 2020-06-20 09:12:55Z

According to documentation:

Note, the json parameter is ignored if either data or files is passed.

Your json parameter must be json type, like this:

import requests json_data = {'data': 'hello world'} files_data = {"dirname/file_name": bytearray(4)} response = requests.post('http://127.0.0.1:80/', json = 'hello world')

If you want to use file and json together then don't encode using json.

Also do not set the Content-type header yourself, leave that to pyrequests to generate

payload = {"param_1": "value_1", "param_2": "value_2"} files = { 'json': (None, json.dumps(payload), 'application/json'), 'file': (os.path.basename(file), open(file, 'rb'), 'application/octet-stream') } r = requests.post(url, files=files)

For more information see this thread How to send JSON as part of multipart POST-request

alphanumeric · Accepted Answer · 2019-08-15 15:42:47Z

The working solution is posted below:

server.py

import os import json import tempfile from flask import Flask, request app = Flask(__name__) @app.route('/', methods=['GET', 'POST']) def index(): print('get_json: %s get_data: %s' % (type(request.get_json()), type(request.get_data())) ) for key, value in request.files.items(): if value.content_type == 'application/json': data = json.loads(value.stream.read()) print('got json data %s' % data) elif value.content_type == 'application/octet-stream': dst_filepath = os.path.join(tempfile.mktemp(), value.filename) if not os.path.exists(os.path.dirname(dst_filepath)): os.makedirs(os.path.dirname(dst_filepath)) with open(dst_filepath, 'wb') as fd: for chunk in value: fd.write(chunk) print('saved file as %s' % dst_filepath) return 'OK', 200 app.run('0.0.0.0', 80)

client.py

import requests import json import os payload = {"param_1": "value_1", "param_2": "value_2"} filepath = '/file/path/to/local_file.zip' files = {'json': ('some-json', json.dumps(payload), 'application/json'), 'file': (os.path.basename(filepath), open(filepath, 'rb'), 'application/octet-stream')} response = requests.post('http://127.0.0.1:80/', files=files)

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