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Python File Upload: Simulate POST request with multipart/Form-Data

Python urllib3 : Exercise-19 with Solution

Write a Python program that makes a POST request with multipart/form-data to simulate file uploads.

Sample Solution:

Python Code :

import urllib3

# Create a PoolManager
http = urllib3.PoolManager()

# Specify the file and URL
file_path = 'test.txt'
upload_url = 'https://example.com/upload'

# Prepare the multipart/form-data payload
fields = {
    'field1': 'value1',  # Additional form fields if needed
    'field2': 'value2',
    'file': ('filename.txt', open(file_path, 'rb').read(), 'text/plain')
}

# Set the Content-Type header to multipart/form-data
headers = {'Content-Type': 'multipart/form-data'}

# Make the POST request
response = http.request('POST', upload_url, fields=fields, headers=headers)

# Receive and print the response
print(response.data.decode('utf-8'))

Sample Output:

<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
         "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
	<head>
		<title>404 - Not Found</title>
	</head>
	<body>
		<h1>404 - Not Found</h1>
		<script type="text/javascript" src="//obj.ac.bcon.ecdns.net/ec_tpm_bcon.js"></script>
	</body>
</html>

Explanation:

Here's a brief explanation of the above Python urllib3 library code:

  • Import the necessary modules:
    • Import the "urllib3" module.
  • Create a PoolManager object:
    • Create a PoolManager object to manage the connection pool for making HTTP requests.
  • Specify the file and URL:
    • Define the path to the file you want to upload.
    • Specify the target URL for the file upload.
  • Prepare the multipart/form-data Payload:
    • Create a 'fields' dictionary to include form fields and the file to be uploaded.
    • Set the 'Content-Type' header to 'multipart/form-data'.
  • Make the POST Request:
    • Use the "request()" method of the 'PoolManager' to send a POST request.
    • Provide the URL, fields (payload), and headers.
  • Receive and Print the Response:
    • Receive the response and print the content

Flowchart:

Flowchart: Python File Upload: Simulate POST request with multipart/Form-Data.

Python Code Editor :

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Next: Python Program: Maximum connection Pool size analysis.

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