Will be nice to clear auth credentials. For example, I'm using a proxy that accepts options via username:

```
proxy.com:8080
user: wiliam_country_US
```

So, if I want to change the peer node, I change my username:

```
proxy.com:8080
user: wiliam_country_GB
```

But, I'm not changing the proxy, so electron has valid credentials and is not going to trigger `login` event.

I'm searching the way to clean auth settings so electron asks them again.
atom/browser/api/atom_api_url_request.cc
auto error_object = v8::Exception::Error(mate::StringToV8(isolate(), error));
  if (isRequestError) {
    request_state_.SetFlag(RequestStateFlags::kFailed);
    EmitRequestEvent(false, "error", error_object);
  } else {
    response_state_.SetFlag(ResponseStateFlags::kFailed);
    EmitResponseEvent(false, "error", error_object);
  }
  Close();
}
int URLRequest::StatusCode() const {
  if (response_headers_) {
    return response_headers_->response_code();
  }
  return -1;
}
std::string URLRequest::StatusMessage() const {
  std::string result;
  if (response_headers_) {
    result = response_headers_->GetStatusText();
  }
  return result;
}
net::HttpResponseHeaders* URLRequest::RawResponseHeaders() const {
  return response_headers_.get();
}
uint32_t URLRequest::ResponseHttpVersionMajor() const {