How to Correctly Upload Multipart Files Using Python's `requests` Library?

Multipart File Uploading with Python Requests

Encountering issues uploading files to a server using the Python requests library can be challenging. This article aims to address a common problem where the server fails to receive files submitted through POST requests.

The provided code follows best practices for uploading a file as part of a form submission. However, the issue lies in how the value of the 'upload_file' key is populated. To properly send the file, the correct syntax is:

files = {'upload_file': open('file.txt','rb')}
values = {'DB':'photcat' , 'OUT':'csv' , 'SHORT':'short'}
r=requests.post(url,files=files,data=values)

Here, we populate the 'upload_file' key with the file object itself, allowing the library to handle the multi-part form correctly. The server should now receive the file as intended.

Understanding Requests' File Handling

Requests handles file uploads using multi-part form data. By specifying the file in the 'files' parameter, it automatically packages the file and relevant metadata into a multipart body. The resulting body includes:

• A MIME header with the filename
• The file's contents

As a result, the server receives a complete MIME multipart package containing the necessary information to process the uploaded file.

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