How to detect failed requests through web extensions

One of the best things to happen to the web user experience is web extensions. Browsers are powerful, but extensions bring new levels of functionality. Whether it’s a cryptocurrency wallet, media player, or other popular plugins, web extensions have become essential for everyday tasks.

Working on MetaMask, I’m thrown into the world of making everything Ethereum-centric work. One of their functions is to ensure that: .eth The domain resolves to ENS when you type it in the address bar.request to https://vitalik.ethOf course it will fail, .eth is not a natively supported top-level domain, so you must intercept this erroneous request.

// Add an onErrorOccurred event via the browser.webRequest extension API
browser.webRequest.onErrorOccurred.addListener((details) => 
  const  tabId, url  = details;
  const  hostname  = new URL(url);

  if(hostname.endsWith('.eth')) 
    // Redirect to wherever I want the user to go
    browser.tabs.update(tabId,  url: ` );
  
,

  urls:[`*://*.eth/*`],
  types: ['main_frame'],
);

Web extensions are browser.webRequest.onErrorOccurred A method that developers can plug in to listen for erroneous requests.This API does the following do not have catch 4** and 5** Response error. In the above case, we would ask: .eth Specify the hostname and redirect to ENS.

you can hire onErrorOccurred For various reasons, discovering custom hostnames is great.