How do I make an http request using cookies on flutter?

Here's an example of how to grab a session cookie and return it on subsequent requests. You could easily adapt it to return multiple cookies. Make a Session class and route all your GETs and POSTs through it.

class Session {  Map<String, String> headers = {};  Future<Map> get(String url) async {    http.Response response = await http.get(url, headers: headers);    updateCookie(response);    return json.decode(response.body);  }  Future<Map> post(String url, dynamic data) async {    http.Response response = await http.post(url, body: data, headers: headers);    updateCookie(response);    return json.decode(response.body);  }  void updateCookie(http.Response response) {    String rawCookie = response.headers['set-cookie'];    if (rawCookie != null) {      int index = rawCookie.indexOf(';');      headers['cookie'] =          (index == -1) ? rawCookie : rawCookie.substring(0, index);    }  }}

I have improved the Richard Heap's solution to be capable to process multiple 'Set-cookies' and multiple cookies.

In my case, the server returns multiples 'Set-cookies'. The http package concatenate all the set-cookies headers in one header and separate it by comma (',').

class NetworkService {  final JsonDecoder _decoder = new JsonDecoder();  final JsonEncoder _encoder = new JsonEncoder();  Map<String, String> headers = {"content-type": "text/json"};  Map<String, String> cookies = {};  void _updateCookie(http.Response response) {    String allSetCookie = response.headers['set-cookie'];    if (allSetCookie != null) {      var setCookies = allSetCookie.split(',');      for (var setCookie in setCookies) {        var cookies = setCookie.split(';');        for (var cookie in cookies) {          _setCookie(cookie);        }      }      headers['cookie'] = _generateCookieHeader();    }  }  void _setCookie(String rawCookie) {    if (rawCookie.length > 0) {      var keyValue = rawCookie.split('=');      if (keyValue.length == 2) {        var key = keyValue[0].trim();        var value = keyValue[1];        // ignore keys that aren't cookies        if (key == 'path' || key == 'expires')          return;        this.cookies[key] = value;      }    }  }  String _generateCookieHeader() {    String cookie = "";    for (var key in cookies.keys) {      if (cookie.length > 0)        cookie += ";";      cookie += key + "=" + cookies[key];    }    return cookie;  }  Future<dynamic> get(String url) {    return http.get(url, headers: headers).then((http.Response response) {      final String res = response.body;      final int statusCode = response.statusCode;      _updateCookie(response);      if (statusCode < 200 || statusCode > 400 || json == null) {        throw new Exception("Error while fetching data");      }      return _decoder.convert(res);    });  }  Future<dynamic> post(String url, {body, encoding}) {    return http        .post(url, body: _encoder.convert(body), headers: headers, encoding: encoding)        .then((http.Response response) {      final String res = response.body;      final int statusCode = response.statusCode;      _updateCookie(response);      if (statusCode < 200 || statusCode > 400 || json == null) {        throw new Exception("Error while fetching data");      }      return _decoder.convert(res);    });  }}

I've published a small flutter library called requests to assist with cookie-aware http requests.

dependencies:  requests: ^3.0.1

Usage:

import 'package:requests/requests.dart';// ...// this will persist cookiesvar r1 = await Requests.post("https://example.com/api/v1/login", json: {"username":"...", "password":"..."} ); r1.raiseForStatus();// this will re-use the persisted cookiesvar r2 = await Requests.get("https://example.com/api/v1/stuff"); r2.raiseForStatus();print(r2.json()['id'])

find out more about requests