set global header flutter https code example

Example: set global header flutter https

import 'dart:convert';

import 'package:http/http.dart' as http;
import 'package:http/http.dart';

class MyClient extends http.BaseClient {
  final Map _defaultHeaders;
  http.Client _httpClient = http.Client();

  MyClient(this._defaultHeaders);

  @override
  Future send(http.BaseRequest request) {
    return _httpClient.send(request);
  }

  @override
  Future get(url, {Map headers}) {
    return _httpClient.get(url, headers: _mergedHeaders(headers));
  }

  @override
  Future post(url, {Map headers, dynamic body, Encoding encoding}) {
    return _httpClient.post(url, headers: _mergedHeaders(headers), body: body, encoding: encoding);
  }

  @override
  Future patch(url, {Map headers, dynamic body, Encoding encoding}) {
    return _httpClient.patch(url, headers: _mergedHeaders(headers), body: body, encoding: encoding);
  }

  @override
  Future put(url, {Map headers, dynamic body, Encoding encoding}) {
    return _httpClient.put(url, headers: _mergedHeaders(headers), body: body, encoding: encoding);
  }

  @override
  Future head(url, {Map headers}) {
    return _httpClient.head(url, headers: _mergedHeaders(headers));
  }

  @override
  Future delete(url, {Map headers}) {
    return _httpClient.delete(url, headers: _mergedHeaders(headers));
  }

  Map _mergedHeaders(Map headers) =>
      {...?_defaultHeaders, ...?headers};
}