Enable request tests on all platforms (cfug#1929)

<!-- Write down your pull request descriptions. -->



### New Pull Request Checklist

- [x] I have read the
[Documentation](https://pub.dev/documentation/dio/latest/)
- [x] I have searched for a similar pull request in the
[project](https://github.com/cfug/dio/pulls) and found none
- [x] I have updated this branch with the latest `main` branch to avoid
conflicts (via merge from master or rebase)
- [x] I have added the required tests to prove the fix/feature I'm
adding
- [x] I have updated the documentation (if necessary)
- [x] I have run the tests without failures
- [x] I have updated the `CHANGELOG.md` in the corresponding package

### Additional context and info (if any)

<!-- Provide more context and info about the PR. -->

dio/CHANGELOG.md

@@ -7,6 +7,8 @@ See the [Migration Guide][] for the complete breaking changes list.**
 
 - Fix failing requests throw `DioException`s with `.unknown` instead of `.connectionError` on `SocketException`.
 - Removes the accidentally added `options` argument for `Options.compose`.
+- Fix wrong formatting of multi-value header in `BrowserHttpClientAdapter`.
+- Add warning in debug mode when trying to send data with a `GET` request in web.
 
 ## 5.3.2
 

dio/dart_test.yaml

@@ -1,2 +1,8 @@
 file_reporters:
   json: build/reports/test-results.json
+
+override_platforms:
+  chrome:
+    settings:
+      # disable web security to allow CORS requests
+      arguments: --disable-web-security

dio/lib/src/adapters/browser_adapter.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 import 'dart:convert';
 import 'dart:html';
 import 'dart:typed_data';
+import 'dart:developer' as dev;
 
 import 'package:meta/meta.dart';
 
@@ -10,6 +11,13 @@ import '../dio_exception.dart';
 import '../headers.dart';
 import '../options.dart';
 
+// For the web platform, an inline `bool.fromEnvironment` translates to
+// `core.bool.fromEnvironment` instead of correctly being replaced by the
+// constant value found in the environment at build time.
+//
+// See https://github.com/flutter/flutter/issues/51186.
+const _kReleaseMode = bool.fromEnvironment('dart.vm.product');
+
 HttpClientAdapter createAdapter() => BrowserHttpClientAdapter();
 
 /// The default [HttpClientAdapter] for Web platforms.
@@ -49,7 +57,13 @@ class BrowserHttpClientAdapter implements HttpClientAdapter {
     }
 
     options.headers.remove(Headers.contentLengthHeader);
-    options.headers.forEach((key, v) => xhr.setRequestHeader(key, '$v'));
+    options.headers.forEach((key, v) {
+      if (v is Iterable) {
+        xhr.setRequestHeader(key, v.join(', '));
+      } else {
+        xhr.setRequestHeader(key, v.toString());
+      }
+    });
 
     final connectTimeout = options.connectTimeout;
     final receiveTimeout = options.receiveTimeout;
@@ -71,7 +85,9 @@ class BrowserHttpClientAdapter implements HttpClientAdapter {
           xhr.status!,
           headers: xhr.responseHeaders.map((k, v) => MapEntry(k, v.split(','))),
           statusMessage: xhr.statusText,
-          isRedirect: xhr.status == 302 || xhr.status == 301,
+          isRedirect: xhr.status == 302 ||
+              xhr.status == 301 ||
+              options.uri.toString() != xhr.responseUrl,
         ),
       );
     });
@@ -198,7 +214,8 @@ class BrowserHttpClientAdapter implements HttpClientAdapter {
     });
 
     cancelFuture?.then((_) {
-      if (xhr.readyState < 4 && xhr.readyState > 0) {
+      if (xhr.readyState < HttpRequest.DONE &&
+          xhr.readyState > HttpRequest.UNSENT) {
         connectTimeoutTimer?.cancel();
         try {
           xhr.abort();
@@ -215,6 +232,15 @@ class BrowserHttpClientAdapter implements HttpClientAdapter {
     });
 
     if (requestStream != null) {
+      if (!_kReleaseMode && options.method == 'GET') {
+        dev.log(
+          'GET request with a body data are not support on the '
+          'web platform. Use POST/PUT instead.',
+          level: 900,
+          name: '🔔 Dio',
+          stackTrace: StackTrace.current,
+        );
+      }
       final completer = Completer<Uint8List>();
       final sink = ByteConversionSink.withCallback(
         (bytes) => completer.complete(Uint8List.fromList(bytes)),