Flutter_map 6.1.0瓦片加载缓慢及SocketException问题求助

升级flutter_map至6.1.0（同步升级Flutter）后，出现加载Google Maps或OpenStreetMaps瓦片初始极慢的问题，最终触发连接错误，且在Android/iOS真机、模拟器全平台复现。已确认网络连接稳定，AndroidManifest.xml中已为debug和release模式配置必要网络权限：

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

错误日志 #

错误1 #

═══════ Exception caught by image resource service ════════════════════════════ 
Connection closed before full header was received, uri=http://mt3.google.com/vt/lyrs=m&x=243&y=204&z=9&apistyle=s.t%3A17%7Cs.e%3Alg%7Cp.v%3Aoff

错误2及堆栈信息 #

═══════ Exception caught by image resource service ════════════════════════════
The following _ClientSocketException was thrown resolving an image codec:
ClientException with SocketException: Connection attempt cancelled, host: mt3.google.com, port: 80, uri=http://mt3.google.com/vt/lyrs=m&x=15841&y=12906&z=15&apistyle=s.t%3A17%7Cs.e%3Alg%7Cp.v%3Aoff

When the exception was thrown, this was the stack:
#0      IOClient.send (package:http/src/io_client.dart:154:7)
io_client.dart:154
<asynchronous suspension>
#1      RetryClient.send (package:http/retry.dart:115:20)
retry.dart:115
<asynchronous suspension>
#2      BaseClient._sendUnstreamed (package:http/src/base_client.dart:93:32)
base_client.dart:93
<asynchronous suspension>
#3      BaseClient.readBytes (package:http/src/base_client.dart:58:22)
base_client.dart:58
<asynchronous suspension>
#4      FlutterMapNetworkImageProvider._loadAsync (package:flutter_map/src/layer/tile_layer/tile_provider/network_image_provider.dart:84:11)
network_image_provider.dart:84
<asynchronous suspension>
#5      MultiFrameImageStreamCompleter._handleCodecReady (package:flutter/src/painting/image_stream.dart:969:3)
image_stream.dart:969
<asynchronous suspension>

URL: http://mt3.google.com/vt/lyrs=m&x=15841&y=12906&z=15&apistyle=s.t%3A17|s.e%3Alg|p.v%3Aoff
Fallback URL: null
Current provider: FlutterMapNetworkImageProvider()
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by image resource service ════════════════════════════
ClientException with SocketException: Connection attempt cancelled, host: mt3.google.com, port: 80, uri=http://mt3.google.com/vt/lyrs=m&x=15840&y=12903&z=15&apistyle=s.t%3A17%7Cs.e%3Alg%7Cp.v%3Aoff
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by image resource service ════════════════════════════
ClientException with SocketException: Connection attempt cancelled, host: mt3.google.com, port: 80, uri=http://mt3.google.com/vt/lyrs=m&x=15841&y=12902&z=15&apistyle=s.t%3A17%7Cs.e%3Alg%7Cp.v%3Aoff
════════════════════════════════════════════════════════════════════════════════

环境信息 #

Doctor summary (to see all details, run flutter doctor -v): 
[√] Flutter (Channel stable, 3.16.9, on Microsoft Windows [Version 10.0.19045.3930], locale en-US) 
[√] Windows Version (Installed version of Windows is version 10 or higher) 
[√] Android toolchain - develop for Android devices (Android SDK version 34.0.0) 
[√] Chrome - develop for the web 
[√] Visual Studio - develop Windows apps (Visual Studio Build Tools 2022 17.3.6) 
[√] Android Studio (version 2023.1) 
[√] VS Code (version 1.86.1) 
[√] Connected device (4 available) 
[√] Network resources

• No issues found!

相关代码 #

页面build函数代码：

Widget build(BuildContext context) {
  return Scaffold(
    body: Stack(
      children: [
        Container(
          color: Colors.white,
          child: FlutterMap(
            key: GlobalObjectKey("gmap"),
            mapController: mapController,
            options: mapOptions(),
            children: <Widget>[
              TileLayer(
                urlTemplate: 'http://{s}.google.com/vt/lyrs=m&x={x}&y={y}&z={z}&apistyle=s.t%3A17|s.e%3Alg|p.v%3Aoff',
                subdomains: ['mt0', 'mt1', 'mt2', 'mt3'],
              ),
              MarkerLayer(markers: markers),
            ],
          ),
        ), 
      ],
    ),
  );
}

依赖信息 #

|-- flutter_map 6.1.0
|   |-- async 2.11.0
|   |   |-- collection...
|   |   '-- meta...      
|   |-- latlong2 0.9.0   
|   |   '-- intl...      
|   |-- logger 2.0.2+1   
|   |-- polylabel 1.0.1  
|   |   '-- collection...
|   |-- proj4dart 2.1.0  
|   |   |-- mgrs_dart 2.0.0
|   |   |   '-- unicode 0.3.1
|   |   |       '-- lists 1.0.1
|   |   |           '-- meta...
|   |   |-- wkt_parser 2.0.0
|   |   '-- meta...
|   |-- collection...
|   |-- flutter...
|   |-- http...
|   |-- meta...
|   '-- vector_math...
|-- flutter_map_marker_cluster 1.3.4
|   |-- flutter_map_marker_popup 6.1.2
|   |   |-- animated_stack_widget 0.0.4
|   |   |   '-- flutter...
|   |   |-- flutter...
|   |   |-- flutter_map...
|   |   |-- latlong2...
|   |   '-- provider...
|   |-- flutter...
|   |-- flutter_map...
|   '-- latlong2...
|-- http 1.2.0
|   |-- http_parser 4.0.2
|   |   |-- typed_data 1.3.2
|   |   |   '-- collection...
|   |   |-- collection...
|   |   |-- source_span...
|   |   '-- string_scanner...
|   |-- async...
|   |-- meta...
|   '-- web...
|-- http_client 1.5.3
|   |-- buffer 1.2.2
|   |-- executor 2.2.3
|   |   '-- stack_trace...
|   '-- http...
|-- intl 0.18.1
|   |-- clock 1.1.1
|   |-- path 1.8.3
|   '-- meta...

恳请提供解决思路或建议，感谢帮助！

内容的提问来源于stack exchange，提问作者Team CV