How to decode a Gzip Http Response in Flutter?
4,118
Solution 1
I'm using GZipCodec
from dart:io
.
Try it like this to return the response as a String
.
Future<String> sendRequest({String path, Map<String,dynamic> params}) async {
final String url = Constants.testURL+path;
var body = jsonEncode(params);
Response response = await post(url, body:body);
final decoded_data = GZipCodec().decode(response.bodyBytes);
return utf8.decode(decoded_data, allowMalformed: true);
}
Solution 2
The body of a response will be automatically uncompressed.
Visit https://api.flutter.dev/flutter/dart-io/HttpClient/autoUncompress.html
Author by
Rob13
Updated on December 13, 2022Comments
-
Rob13 over 1 year
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?
Here's what I have tried:
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<Response> sendRequest({String path, Map<String,dynamic> 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, <…> //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<void> 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<String, dynamic> 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'); } }
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
gzipped_data
as a List of Integers as you can see above. How can I get the JSON from it?