Flutter运行Chrome应用报错：Self-referential requests to this proxy server are forbidden

Launching lib\main.dart on Chrome in debug mode...
Waiting for connection from debug service on Chrome...
Unexpected character
403 OK; body:

"<HTML><TITLE>Forbidden</TITLE><H1>Self-referential requests to proxy are forbidden</H1>Self-referential requests to this proxy server are forbidden</HTML>"


#0      ChromeConnection.getTabs (package:webkit_inspection_protocol/webkit_inspection_protocol.dart:68:11)
<asynchronous suspension>
#1      ChromiumLauncher._getFirstTab (package:flutter_tools/src/web/chrome.dart:432:11)
<asynchronous suspension>
#2      ChromiumLauncher.connect (package:flutter_tools/src/web/chrome.dart:408:9)
<asynchronous suspension>
#3      ChromiumDevice.startApp (package:flutter_tools/src/web/web_device.dart:145:17)
<asynchronous suspension>
#4      ResidentWebRunner.run.<anonymous closure> (package:flutter_tools/src/isolated/resident_web_runner.dart:304:9)
<asynchronous suspension>
#5      asyncGuard.<anonymous closure> (package:flutter_tools/src/base/async_guard.dart:111:24)
<asynchronous suspension>

Finished with error: Unable to connect to Chrome debug port: 64538
 Unexpected character
403 OK; body:
<HTML><TITLE>Forbidden</TITLE><H1>Self-referential requests to proxy are forbidden</H1>Self-referential requests to this proxy server are forbidden</HTML>

已尝试的无效操作 #

• 删除Windows环境变量中的http_proxy、https_proxy和no_proxy
• 以管理员身份启动Android Studio

解决方案 #

1. 检查Chrome独立代理设置 #

Chrome可能保留了单独的代理配置，不受系统环境变量影响：

• 打开Chrome，输入chrome://settings/system
• 关闭使用代理服务器选项，或确保代理规则中排除本地调试地址（如127.0.0.1、localhost）

2. 强制Flutter启动无代理Chrome #

在终端执行启动命令时添加禁用代理参数：

flutter run -d chrome --no-proxy-server

3. 清除Chrome进程与调试端口残留 #

• 打开任务管理器，结束所有chrome.exe相关进程（包括后台进程）
• 重启项目或指定新调试端口：

flutter run -d chrome --web-port=8080

4. 重置Chrome默认设置 #

• 打开Chrome的chrome://settings/reset
• 选择将设置恢复为原始默认值，清除异常插件或代理配置影响

5. 检查用户级环境变量 #

除系统环境变量外，需确认当前用户的变量设置：

• 右键此电脑 → 属性 → 高级系统设置 → 环境变量
• 在用户变量中删除http_proxy、https_proxy相关条目，重启电脑后重试

内容的提问来源于stack exchange，提问作者NiTiN