Bypass a proxy on error 502 Bad gateway

[Jerzy]

I am using chrome.proxy.settings.set() to pass all HTTP traffic through proxy. However, sometimes the proxy server responds with an error 502 Bad gateway. In such case I would like to bypass the proxy for that particular request and send it directly. How can I achieve this?

Thanks!

[Jerzy]

I managed to do this by using chrome.webRequest.onHeadersReceived.addListener and a callback:

function(details){

  if(details.statusLine.indexOf('502 Bad gateway') > -1) {

chrome.proxy.settings.set({

value: {mode: 'system'},

scope: 'regular'

});

setTimeout(function(){

  chrome.proxy.settings.set({

value: {mode: 'fixed_servers', ...},

scope: 'regular'

  });

}, 10000);

  }

}