POST pdf-file is not received by API, Python, Requests

Question

So I built an API which takes in a pdf file and json and converts the file into text. Testing with Postman works fine, however now I try to make a script to send multiple images and the API does not receive the image I send it in the script. It receives the request but not its contents. Additionally I don't get the json file either, while it does show on the script side.

I looked at the Postman request and implemented it in the script, however it still does not work. I tried sending only the file without a json and could not get it working. I've been looking in the documentation of flask and request, but I'm not able to find the explanation why it does not receive the image.

#Script code
import requests
import time
import glob

url = "http://127.0.0.1:5000/transcribe"
for file in glob.glob("/Receipts_to_scan/*.pdf"):

    print(open(file, "rb"))

    files = {
        'file': open(file, 'rb'),
        'json': '{"method":"sypht"}'
    }

    headers = {
        'Accept': "application/pdf",
        'content-type': "multipart/form-data",
        'Connection': 'keep-alive'
    }

    response_decoded_json = requests.post(url, files=files, headers=headers)
    time.sleep(5)
    print(response_decoded_json)

#--------------------------
#API code
from flask import Flask, request
@app.route("/transcribe", methods = ["POST"])
def post():
    #Getting the JSON data with all the settings in it
    json_data = request.files["json"]
    print(json_data)
    image = request.files["file"]
    print(image)

PythonSherpa · Accepted Answer · 2019-08-08 12:49:03Z

4

Could you try the following? This way you can combine a file and other data (like a dictionary) in a request.

Change your Flask API:

#Getting the JSON data with all the settings in it
json_data = request.form    # <--- change this line
print(json_data)

And then make a request like this (without manually setting the headers):

files = {
    'file': (file, open(file, 'rb'), "application/pdf")
}

data = {
    "method": "sypht"
}

response_decoded_json = requests.post(url, files=files, data=data)
time.sleep(5)
print(response_decoded_json)

This should give you an ImmutableMultiDict and a FileStorage object to work with.

Your API then prints:

ImmutableMultiDict([('method', 'sypht')])

<FileStorage: 'test.pdf' ('application/pdf')>

edited Aug 8, 2019 at 12:49

answered Aug 8, 2019 at 11:41

PythonSherpa

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2 Comments

Sil Bouwman Over a year ago

Nice! This helped! The only change I made to get it working was to specify the file type in the files variable.

chia yongkang Over a year ago

do you mind sharing the code for your changes?

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