Python urllib3: Demonstrate Cookie persistence for seamless Web requests

Last update on February 08 2024 05:27:44 (UTC/GMT +8 hours)

Python urllib3 : Exercise-18 with Solution

Write a Python program that sends and receives cookies with urllib3, demonstrating cookie persistence.

Sample Solution:

Python Code :

import urllib3

# Create a PoolManager
http = urllib3.PoolManager()

# Step 1: Initial Request
initial_url = 'https://example.com/initial'
initial_response = http.request('GET', initial_url)

# Step 2: Extract Cookies from Initial Response
initial_cookies = initial_response.headers.get('Set-Cookie')

# Step 3: Persist Cookies (store in a dictionary, for example)
persisted_cookies = {'cookie_name': 'cookie_value'}

# Step 4: Subsequent Request with Persisted Cookies
subsequent_url = 'https://example.com/subsequent'
subsequent_headers = {'Cookie': '; '.join([f'{name}={value}' for name, value in persisted_cookies.items()])}
subsequent_response = http.request('GET', subsequent_url, headers=subsequent_headers)

# Step 5: Receive and Print Response
print(subsequent_response.data.decode('utf-8'))

Sample Output:

<!doctype html>
<html>
<head>
    <title>Example Domain</title>

    <meta charset="utf-8" />
    <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <style type="text/css">
    body {
        background-color: #f0f0f2;
        margin: 0;
        padding: 0;
        font-family: -apple-system, system-ui, BlinkMacSystemFont, "Segoe UI", "Open Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
        
    }
    div {
        width: 600px;
        margin: 5em auto;
        padding: 2em;
        background-color: #fdfdff;
        border-radius: 0.5em;
        box-shadow: 2px 3px 7px 2px rgba(0,0,0,0.02);
    }
    a:link, a:visited {
        color: #38488f;
        text-decoration: none;
    }
    @media (max-width: 700px) {
        div {
            margin: 0 auto;
            width: auto;
        }
    }
    </style>    
</head>

<body>
<div>
    <h1>Example Domain</h1>
    <p>This domain is for use in illustrative examples in documents. You may use this
    domain in literature without prior coordination or asking for permission.</p>
    <p><a href="https://www.iana.org/domains/example">More information...</a></p>
</div>
</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.

Send a Request with Cookies:

Make an initial GET request to a URL and receive a response.
Extract cookies from response headers.

Persist Cookies:

Store the received cookies in a data structure (e.g., a dictionary) for persistence.

Send a Subsequent Request with Persisted Cookies:

Make another request to the same or another URL, including the persisted cookies in the request headers.

Receive and Print the Response:

Receive the response and print the content to verify successful communication with persisted cookies.

Flowchart:

Python Code Editor :

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