re-create client for each call

Author: xr0master

lib/emailjs.dart

@@ -22,20 +22,20 @@ class EmailJS {
   static String _host = 'api.emailjs.com';
 
   /// HTTP Client specified in the [init] method
-  static http.Client _httpClient = http.Client();
+  static http.Client? _httpClient;
 
   /// Global configuration for EmailJS
   ///
   /// Sets globally the EmailJS [options]
   static void init(
     Options options, [
     String? host,
-    http.Client? httpClient,
+    http.Client? customHttpClient,
   ]) {
     EmailJS._publicKey = options.publicKey;
     EmailJS._privateKey = options.privateKey;
     EmailJS._host = host ?? 'api.emailjs.com';
-    EmailJS._httpClient = httpClient ?? http.Client();
+    EmailJS._httpClient = customHttpClient;
   }
 
   /// Sends the email through the [serviceID] using the ready-made [templateID].
@@ -63,9 +63,9 @@ class EmailJS {
     };
 
     return await sendJSON(
-      EmailJS._httpClient,
       Uri.https(EmailJS._host, 'api/v1.0/email/send'),
       json.encode(params),
+      EmailJS._httpClient,
     );
   }
 }

lib/src/api/send_json.dart

@@ -3,9 +3,12 @@ import '../models/emailjs_response_status.dart';
 
 /// sends JSON object via HTTP POST
 Future<EmailJSResponseStatus> sendJSON(
-    http.Client client, Uri uri, String data) async {
+    Uri uri, String data, http.Client? customClient) async {
+  
+  final client = customClient ?? http.Client();
+
   try {
-    var response = await client.post(
+    final response = await client.post(
       uri,
       headers: {
         'Content-Type': 'application/json',