Learn how to Detect Failed Requests by way of Net Extensions

Probably the greatest issues that ever occurred to t he consumer expertise of the net has been internet extensions. Browsers are highly effective however extensions carry a brand new stage of performance. Whether or not it is crypto wallets, media gamers, or different common plugins, internet extensions have turn out to be important to on daily basis duties.

Engaged on MetaMask, I’m thrust right into a world of creating all the pieces Ethereum-centric work. A kind of functionalities is making certain that .eth domains resolve to ENS when enter to the deal with bar. Requests to https://vitalik.ethnaturally fail, since .eth is not a natively supported high stage area, so we have to intercept this errant request.

// Add an onErrorOccurred occasion by way of the browser.webRequest extension API
browser.webRequest.onErrorOccurred.addListener((particulars) => {
  const { tabId, url } = particulars;
  const { hostname } = new URL(url);

  if(hostname.endsWith('.eth')) {
    // Redirect to wherever I need the consumer to go
    browser.tabs.replace(tabId, { url: `https://app.ens.domains/${hostname}}` });
  }
},
{
  urls:[`*://*.eth/*`],
  sorts: ['main_frame'],
});

Net extensions present a browser.webRequest.onErrorOccurred technique that builders can plug into to hear for errant requests. This API does not catch 4** and 5** response errors. Within the case above, we search for .eth hostnames and redirect to ENS.

You might make use of onErrorOccurred for any variety of causes, however detecting customized hostnames is a good one!