const axios = require('axios');
const retry = require('retry');

function faultTolerantHttpRequest(URL, cb) {
    // Initialize a retry operation with custom settings
    const operation = retry.operation({
    retries: 5,            // Maximum number of retry attempts
    factor: 2,             // Exponential backoff factor
    minTimeout: 1000,      // Minimum timeout (in milliseconds)
    maxTimeout: 60 * 1000, // Maximum timeout (in milliseconds)
    randomize: true,       // Randomize the timeouts
});

    operation.attempt(function(currentAttempt) {
        // Make an HTTP GET request to http://httpbin.io/status/500
        axios.get(URL)
            .then((response) => {
                // If the request is successful, resolve the Promise with the response body
                cb(null, response.data);
            })
            .catch((error) => {
                // If there's an error, check if retry is allowed.
                if (operation.retry(error)) {
                    return;
                }

                // If all retry attempts are exhausted, reject with the main error
                cb(operation.mainError());
            });
    });
};

faultTolerantHttpRequest('https://httpbin.io/status/500', function(error, result) {
  if (error) {
    // Handle the error
    console.error('Error:', error);
  } else {
    // Process the successful result
    console.log('Result:', result);
  }
});