From 7430df2e10f22600857724c3a49387c6575d3372 Mon Sep 17 00:00:00 2001
From: Alex Li <github@alexv525.com>
Date: Mon, 23 Oct 2023 17:13:16 +0800
Subject: [PATCH] =?UTF-8?q?=E2=9C=A8=20`Headers.caseInsensitive`?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 dio/lib/src/headers.dart | 29 +++++++++++++----
 dio/test/basic_test.dart | 70 +++++++++++++++++++++++++---------------
 2 files changed, 66 insertions(+), 33 deletions(-)

diff --git a/dio/lib/src/headers.dart b/dio/lib/src/headers.dart
index 42854c3e2..2b1873731 100644
--- a/dio/lib/src/headers.dart
+++ b/dio/lib/src/headers.dart
@@ -7,12 +7,16 @@ typedef HeaderForEachCallback = void Function(String name, List<String> values);
 
 /// The headers class for requests and responses.
 class Headers {
-  Headers() : _map = caseInsensitiveKeyMap<List<String>>();
+  Headers({
+    this.caseInsensitive = true,
+  }) : _map = caseInsensitiveKeyMap<List<String>>();
 
   /// Create the [Headers] from a [Map] instance.
-  Headers.fromMap(Map<String, List<String>> map)
-      : _map = caseInsensitiveKeyMap<List<String>>(
-          map.map((k, v) => MapEntry(k.trim().toLowerCase(), v)),
+  Headers.fromMap(
+    Map<String, List<String>> map, {
+    this.caseInsensitive = true,
+  }) : _map = caseInsensitiveKeyMap<List<String>>(
+          map.map((k, v) => MapEntry(k.trim(), v)),
         );
 
   static const acceptHeader = 'accept';
@@ -28,6 +32,11 @@ class Headers {
 
   static final jsonMimeType = MediaType.parse(jsonContentType);
 
+  /// Whether the header key should be case-insensitive.
+  ///
+  /// Defaults to true.
+  final bool caseInsensitive;
+
   final Map<String, List<String>> _map;
 
   Map<String, List<String>> get map => _map;
@@ -35,7 +44,10 @@ class Headers {
   /// Returns the list of values for the header named [name]. If there
   /// is no header with the provided name, [:null:] will be returned.
   List<String>? operator [](String name) {
-    return _map[name.trim().toLowerCase()];
+    if (caseInsensitive) {
+      name = name.toLowerCase();
+    }
+    return _map[name.trim()];
   }
 
   /// Convenience method for the value for a single valued header. If
@@ -63,9 +75,12 @@ class Headers {
   /// cleared before the value [value] is added as its value.
   void set(String name, dynamic value) {
     if (value == null) return;
-    name = name.trim().toLowerCase();
+    if (caseInsensitive) {
+      name = name.toLowerCase();
+    }
+    name = name.trim();
     if (value is List) {
-      _map[name] = value.map<String>((e) => e.toString()).toList();
+      _map[name] = value.map<String>((e) => '$e').toList();
     } else {
       _map[name] = ['$value'.trim()];
     }
diff --git a/dio/test/basic_test.dart b/dio/test/basic_test.dart
index e52faeae6..e21506dcb 100644
--- a/dio/test/basic_test.dart
+++ b/dio/test/basic_test.dart
@@ -8,34 +8,52 @@ import 'mock/adapters.dart';
 import 'utils.dart';
 
 void main() {
-  test('test headers', () {
-    final headers = Headers.fromMap({
-      'set-cookie': ['k=v', 'k1=v1'],
-      'content-length': ['200'],
-      'test': ['1', '2'],
+  group(Headers, () {
+    test('set', () {
+      final headers = Headers.fromMap({
+        'set-cookie': ['k=v', 'k1=v1'],
+        'content-length': ['200'],
+        'test': ['1', '2'],
+      });
+      headers.add('SET-COOKIE', 'k2=v2');
+      expect(headers.value('content-length'), '200');
+      expect(Future(() => headers.value('test')), throwsException);
+      expect(headers['set-cookie']?.length, 3);
+      headers.remove('set-cookie', 'k=v');
+      expect(headers['set-cookie']?.length, 2);
+      headers.removeAll('set-cookie');
+      expect(headers['set-cookie'], isNull);
+      final ls = [];
+      headers.forEach((k, list) => ls.addAll(list));
+      expect(ls.length, 3);
+      expect(headers.toString(), 'content-length: 200\ntest: 1\ntest: 2\n');
+      headers.set('content-length', '300');
+      expect(headers.value('content-length'), '300');
+      headers.set('content-length', ['400']);
+      expect(headers.value('content-length'), '400');
     });
-    headers.add('SET-COOKIE', 'k2=v2');
-    expect(headers.value('content-length'), '200');
-    expect(Future(() => headers.value('test')), throwsException);
-    expect(headers['set-cookie']?.length, 3);
-    headers.remove('set-cookie', 'k=v');
-    expect(headers['set-cookie']?.length, 2);
-    headers.removeAll('set-cookie');
-    expect(headers['set-cookie'], isNull);
-    final ls = [];
-    headers.forEach((k, list) => ls.addAll(list));
-    expect(ls.length, 3);
-    expect(headers.toString(), 'content-length: 200\ntest: 1\ntest: 2\n');
-    headers.set('content-length', '300');
-    expect(headers.value('content-length'), '300');
-    headers.set('content-length', ['400']);
-    expect(headers.value('content-length'), '400');
 
-    final headers1 = Headers();
-    headers1.set('xx', 'v');
-    expect(headers1.value('xx'), 'v');
-    headers1.clear();
-    expect(headers1.map.isEmpty, isTrue);
+    test('clear', () {
+      final headers1 = Headers();
+      headers1.set('xx', 'v');
+      expect(headers1.value('xx'), 'v');
+      headers1.clear();
+      expect(headers1.map.isEmpty, isTrue);
+    });
+
+    test('case-sensitive', () {
+      final headers = Headers.fromMap(
+        {
+          'SET-COOKIE': ['k=v', 'k1=v1'],
+          'content-length': ['200'],
+          'Test': ['1', '2'],
+        },
+        caseInsensitive: false,
+      );
+      expect(headers['SET-COOKIE']?.length, 2);
+      expect(headers['content-length']?.length, 1);
+      expect(headers['Test']?.length, 2);
+    });
   });
 
   test('send with an invalid URL', () async {