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/net/atom_url_request.cc
}
    if (buffer)
      
      chunked_stream_writer_->AppendData(buffer->data(), buffer->size(),
                                         is_last);
    else if (is_last)
      
      chunked_stream_writer_->AppendData(nullptr, 0, true);
    if (first_call) {
      request_->Start();
    }
  } else {
    if (buffer) {
      
      using internal::UploadOwnedIOBufferElementReader;
      auto element_reader =
          UploadOwnedIOBufferElementReader::CreateWithBuffer(std::move(buffer));
      upload_element_readers_.push_back(
          std::unique_ptr<net::UploadElementReader>(element_reader));
    }
    if (is_last) {
      auto elements_upload_data_stream = new net::ElementsUploadDataStream(
          std::move(upload_element_readers_), 0);
      request_->set_upload(
          std::unique_ptr<net::UploadDataStream>(elements_upload_data_stream));
      request_->Start();
    }
  }
}
void AtomURLRequest::DoCancel() {