TrustedCoin service is broken - critical bug | spesmilo/electrum

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During Electrum 4.1.5 launch I got pop-up window - "Sorry! Something went wrong while executing Electrum."

I'm unable to complete any transactions because of this error. As far as I can understand, TrustedCoin is using Cloudflare services and it wants me to pass captcha, which is ridiculous because Electrum is not a browser.

Part of report contents below:

Traceback (most recent call last):
  File "/tmp/.mount_electrm2AfM4/usr/lib/python3.7/site-packages/electrum/util.py", line 1063, in run_with_except_hook
    run_original(*args2, **kwargs2)
  File "/tmp/.mount_electrm2AfM4/usr/lib/python3.7/threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "/tmp/.mount_electrm2AfM4/usr/lib/python3.7/site-packages/electrum/plugins/trustedcoin/trustedcoin.py", line 488, in f
    return func(self, *args, **kwargs)
  File "/tmp/.mount_electrm2AfM4/usr/lib/python3.7/site-packages/electrum/plugins/trustedcoin/trustedcoin.py", line 499, in request_billing_info
    billing_info = server.get(wallet.get_user_id()[1])
  File "/tmp/.mount_electrm2AfM4/usr/lib/python3.7/site-packages/electrum/plugins/trustedcoin/trustedcoin.py", line 210, in get
    return self.send_request('get', 'cosigner/%s' % quote(id))
  File "/tmp/.mount_electrm2AfM4/usr/lib/python3.7/site-packages/electrum/plugins/trustedcoin/trustedcoin.py", line 157, in send_request
    timeout=timeout)
  File "/tmp/.mount_electrm2AfM4/usr/lib/python3.7/site-packages/electrum/network.py", line 1322, in send_http_on_proxy
    return coro.result()
  File "/tmp/.mount_electrm2AfM4/usr/lib/python3.7/concurrent/futures/_base.py", line 435, in result
    return self.__get_result()
  File "/tmp/.mount_electrm2AfM4/usr/lib/python3.7/concurrent/futures/_base.py", line 384, in __get_result
    raise self._exception
  File "/tmp/.mount_electrm2AfM4/usr/lib/python3.7/site-packages/electrum/network.py", line 1300, in _send_http_on_proxy
    return await on_finish(resp)
  File "/tmp/.mount_electrm2AfM4/usr/lib/python3.7/site-packages/electrum/plugins/trustedcoin/trustedcoin.py", line 135, in handle_response
    raise TrustedCoinException(message, resp.status)
electrum.plugins.trustedcoin.trustedcoin.TrustedCoinException: <!DOCTYPE html>
<!--[if lt IE 7]> <html class="no-js ie6 oldie" lang="en-US"> <![endif]-->
<!--[if IE 7]>    <html class="no-js ie7 oldie" lang="en-US"> <![endif]-->
<!--[if IE 8]>    <html class="no-js ie8 oldie" lang="en-US"> <![endif]-->
<!--[if gt IE 8]><!--> <html class="no-js" lang="en-US"> <!--<![endif]-->
<head>

<title>Please Wait... | Cloudflare</title>
  
<meta name="captcha-bypass" id="captcha-bypass" />
<meta charset="UTF-8" />
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1" />
<meta name="robots" content="noindex, nofollow" />
<meta name="viewport" content="width=device-width,initial-scale=1" />
<link rel="stylesheet" id="cf_styles-css" href="/cdn-cgi/styles/cf.errors.css" type="text/css" media="screen,projection" />
<!--[if lt IE 9]><link rel="stylesheet" id='cf_styles-ie-css' href="/cdn-cgi/styles/cf.errors.ie.css" type="text/css" media="screen,projection" /><![endif]-->
<style type="text/css">body{margin:0;padding:0}</style>

Another part:

<noscript id="cf-captcha-bookmark" class="cf-captcha-info">
 <h1 data-translate="turn_on_js" style="color:#bd2426;">Please turn JavaScript on and reload the page.</h1>
 </noscript>
   <div id="no-cookie-warning" class="cookie-warning" data-translate="turn_on_cookies" style="display:none">
     <p data-translate="turn_on_cookies" style="color:#bd2426;">Please enable Cookies and reload the page.</p>
   </div>
 <script type="text/javascript">
 //<![CDATA[
   var a = function() {try{return !!window.addEventListener} catch(e) {return !1} },
     b = function(b, c) {a() ? document.addEventListener("DOMContentLoaded", b, c) : document.attachEvent("onreadystatechange", b)};
     b(function(){
       var cookiesEnabled=(navigator.cookieEnabled)? true : false;
       if(!cookiesEnabled){
         var q = document.getElementById('no-cookie-warning');q.style.display = 'block';

Start with electrum/plugins/trustedcoin/trustedcoin.py, especially request_billing_info, send_request, and handle_response, then inspect electrum/network.py where the HTTP response is processed. Reproduce the TrustedCoin request and determine how the Cloudflare HTML response should be handled; done means TrustedCoin transactions can complete without the reported exception.

Written by the indexing model from the issue text.

TrustedCoin service is broken - critical bug

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