When I was looking for the answer, I didn't find anything useful. SentryDioClientAdapter is not exposed to the outside world and cannot be used.

#1015 also said that there is no solution.

Later I found a way to replace it myself:

1. When you initialize Dio(), it will create a DefaultHttpClientAdapter instance for you by default and assign it to dio.httpClientAdapter.

2. We can create a field to save dio.httpClientAdapter in the tool class, such as:

late HttpClientAdapter httpClientAdapter;
httpClientAdapter = dio.httpClientAdapter;

Note: This step needs to be placed before dio.addSentry(), because addSentry will wrap httpClientAdapter as SentryDioClientAdapter.

3. In the place where the agent is set, you can first judge whether the dio.httpClientAdapter is the DefaultHttpClientAdapter type. If not, you can reassign the saved httpClientAdapter. After the agent is set, set dio.addSentry()
   if(!(dio?.httpClientAdapter is DefaultHttpClientAdapter)){
   dio?.httpClientAdapter = HttpRequest().httpClientAdapter;
   }

String proxy = "PROXY ${ipController.text}:${portController.text}";

if(!(dio?.httpClientAdapter is DefaultHttpClientAdapter)){
  dio?.httpClientAdapter = HttpRequest().httpClientAdapter;
}

(dio?.httpClientAdapter as DefaultHttpClientAdapter).onHttpClientCreate =
    (client) {
  client.findProxy = (url) {
    return proxy;
  };

  //Trust certificate for https proxy
  client.badCertificateCallback = (cert, host, port){
    return true;
  };
  return client;
};

if(Channel.currentChannel == APPChannel.DEV){
  dio?.addSentry(
    captureFailedRequests: true,
    maxRequestBodySize: MaxRequestBodySize.always,
    maxResponseBodySize: MaxResponseBodySize.always,
  );
}

Here is how to dynamically add network proxy for Dio

@haozi5460 as mentioned here #1015
Proxy settings should be directly set on Dio if possible,SentryDioClientAdapter is just s wrapper on top of Dio.

wrapper

I know this, but after addSentry adds extensions, DefaultHttpClientAdapter becomes SentryDioClientAdapter, and SentryDioClientAdapter is not open to the outside world and cannot be called externally.

bump, this is still a problem