sj-booking-fix.js

sj-booking-fix.js

// Paste the code below into your webbrowser console and press "enter"
// To open the console you can press "F12" or "Ctrl + Shift + J" for most browsers.
// Read more here: https://appuals.com/open-browser-console/
// Instructions video on my twitter: https://twitter.com/_carlhannes/status/1590441813445599232

// The code re-tries fetching data if it gets status 429, which is the error that the SJ page has
// It does this together with an exponential back-off delay which is common to use with microservices of this type
// Because of these re-tries and the delay, the overall load of the website and the servers will be lower,
// since it does not need to re-fetch requests that actually succeed. Read more on my twitter if you're interested:
// https://twitter.com/_carlhannes/status/1590605735314206721

// I do not have a soundcloud but I heard the artist Yoyo Xno on Spotify is really good:
// https://open.spotify.com/artist/0AZYrtDySQn1YqHbNzYWib?si=1335f829215942b2

window._fetch = window.fetch;
window.fetch = (...args) => {
  return new Promise((resolve, reject) => {
    const maxRetries = 10
    let retries = 0
    const retry = () => {
      window._fetch(...args)
        .then((data) => {
          if (data.status === 429 && retries < maxRetries) {
            retries++
            setTimeout(retry, 500 * Math.pow(2, retries))
          } else {
            resolve(data);
          }
        }).catch(reject)
    }
    retry()
  })
};

sj-bookmark-version.js

// Add this code as the "URL" of a bookmark in your browser to quickly add the booking fix to your browser.
// Good if you want to help parents, grandparents etc, just tell them to click the bookmark before booking.
// Kudos to @_genesis_ai_ https://twitter.com/_genesis_ai_/status/1590778385760157696

javascript:q=window.fetch;window.fetch=(...a)=>new Promise((r,_,R=0,T=U=>q(...a).then(d=>d.status==429?setTimeout(T,500*(2**++R)):r(d)))=%3ET());

Hehe, yes. -- or consider something really revolutionary outside all IT tech: prevent the rush on the servers by getting the train system in order and provide more trains :-D