Python Retry Mechanism with incremental timeouts

Python urllib3 : Exercise-23 with Solution

Write a Python program to set up a retry mechanism with incremental timeouts to handle transient network issues.

Sample Solution:

Python Code :

import urllib3
from urllib3.util.retry import Retry
from urllib3.exceptions import MaxRetryError
import time

def make_request_with_retry(url):
    # Define maximum number of retries
    total_retries = 3
    # Define initial timeout
    initial_timeout = 1  # in seconds
    # Define backoff factor for exponential backoff
    backoff_factor = 2
    # Create a Retry object with incremental timeouts
    retry_strategy = Retry(total=total_retries,
                           status_forcelist=[500, 502, 503, 504],
    # Create a PoolManager with the retry strategy
    http = urllib3.PoolManager(retries=retry_strategy)
    for attempt in range(total_retries + 1):
            # Make a GET request
            response = http.request('GET', url)
            # Check if the request was successful (status code 200)
            if response.status == 200:
                print("Request Successful:")
                break  # Exit the loop if successful
        except MaxRetryError as e:
            print(f"Error: Maximum retries exceeded. {e}")
            break  # Exit the loop if maximum retries exceeded
        except Exception as e:
            print(f"Error: {e}")
        # Increment the timeout for the next retry attempt
        timeout = initial_timeout * (backoff_factor ** attempt)
        print(f"Retrying in {timeout} seconds...")

# Define the URL for the request
url = 'https://www.example.com'

# Make the request with retry mechanism

Sample Output:

Request Successful:
<!doctype html>
    <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;

    <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>


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

  • First define a function "make_request_with_retry" to make a request with a retry mechanism.
  • Use the 'Retry' object from "urllib3.util.retry" to define the retry strategy with incremental timeouts and specific HTTP status codes to retry.
  • Next create a 'PoolManager' with the defined retry strategy.
  • Loop through the request attempts, retrying if necessary.
  • Use exponential backoff to increase the timeout for each retry attempt.
  • Handle exceptions such as 'MaxRetryError' and generic exceptions.
  • Finally make a GET request to the specified URL using the defined retry mechanism.


Flowchart: Python Retry Mechanism with incremental timeouts.

Python Code Editor :

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Next: Python Event Hooks for Request and Response Customization.

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