title: How to decode a Gzip Http Response in Flutter?
body: <p>I am new to Flutter. I am making a Network Request and I am getting the correct response, but the data is Gzipped. I have decompressed the same in Swift, but with Flutter, I am unable to do that. Can anyone please help?</p>
  
  <p>Here's what I have tried:</p>
  
  <pre><code>import 'dart:convert';
  import 'package:http/http.dart';
  import 'package:archive/archive.dart';
  import 'package:flutter_app/Constants/constants.dart';
  
  class ServiceHelper {
  
    static final sharedInstance = ServiceHelper();
  
    Future&lt;Response&gt; sendRequest({String path, Map&lt;String,dynamic&gt; params}) async {
  
      final String url = Constants.testURL+path;
  
      var body = jsonEncode(params);
  
      Response response = await post(url, body:body);
  
      final gZipped_data = GZipDecoder().decodeBytes(response.bodyBytes);
  
      print(gZipped_data); //flutter: [123, 34, 115, 116, 97, 116, 117, 115, 34, 58, 50, 48, 48, 44, 34, 109, 101, 115, 115, 97, 103, 101, 34, 58, 34, 83, 105, 103, 110, 32, 105, 110, 32, 67, 111, 109, 112, 108, 101, 116, 101, 100, 32, 83, 117, 99, 99, 101, 115, 115, 102, 117, 108, 108, 121, 34, 44, 34, 100, 97, 116, 97, 34, 58, 123, 34, 117, 115, 101, 114, 95, 105, 110, 102, 111, 34, 58, 123, 34, 112, 108, 97, 121, 101, 114, 95, 105, 100, 34, 58, 49, 52, 56, 54, 57, 44, 34, 112, 108, 95, 97, 112, 112, 95, 105, 100, 34, 58, 34, 57, 90, 104, 57, 82, 66, 108, 70, 34, 44, 34, 112, 114, 111, 102, 105, 108, 101, 95, 112, 105, 99, 34, 58, 34, 104, 116, 116, 112, 115, 58, 92, 47, 92, 47, 119, 119, 119, 46, 115, 112, 111, 114, 116, 115, 113, 119, 105, 122, 122, 46, 99, 111, 109, 92, 47, 118, 51, 92, 47, 105, 109, 103, 92, 47, 112, 108, 97, 121, 101, 114, 115, 92, 47, 112, 105, 99, 92, 47, 105, 80, 45, 49, 53, 50, 51, 56, 54, 57, 50, 57, 56, 46, 112, 110, 103, 34, 44, 34, 101, 109, 97, 105, 108, 34, 58, 34, 116, 101, 99, 104, 121, &lt;…&gt;
  
  
     //This throws an error: Unhandled Exception: FormatException: Bad UTF-8 encoding 0x8b (at offset 1)
  
      return response;
  
    }
  
  
  }
  
  //This is the login function and it is in a different file main.dart
  
   Future&lt;void&gt; login(
        {String email,
        String name,
        int source,
        String sourceStr,
        String picString,
        String idToken}) async {
      final String playerID = '';
  
      final String token = await getIOSToken().then((token){
  
        return token;
  
      });
  
      Map&lt;String, dynamic&gt; params = {
        "email": email,
        "name": name,
        "player_id": playerID,
        "source_id": source,
        "profile_pic": picString,
        "password": passwordController.text ?? "",
        "ios_token":token,
        "device_type": "I",
        "language_iso": "en",
        "referred_by": "loginDefault",
        "firebase_id_token": idToken,
        "app_version": "4.4.9"
      };
  
      Response response = await ServiceHelper.sharedInstance
          .sendRequest(path: Constants.login, params: params);
  
      if (response.statusCode == 201) {
        // If server returns an OK response, parse the JSON.
        return UserDetails.fromJson(json.decode(response.body));
      } else {
        // If that response was not OK, throw an error.
        throw Exception('Failed to load post');
      }
    }
  
  </code></pre>
  
  <p>The expected response is JSON, but as it is Gzipped and I am unable to decompress it, I do not know how to get the JSON from it. I have tried decoding it and it gives me <code>gzipped_data</code> as a List of Integers as you can see above. How can I get the JSON from it?</p>