Python BaseHTTPRequestHandler在除utf-8以外的任何文件上抛出查找错误

from http.server import BaseHTTPRequestHandler
import codecs

class MyHandler(BaseHTTPRequestHandler):
    def do_GET(self):
        try:
            # 设置请求头的Content-Type为text/html;charset=gbk
            self.send_response(200)
            self.send_header('Content-Type', 'text/html;charset=gbk')
            self.end_headers()

            # 读取文件内容，并按照gbk编码进行解码
            with codecs.open('file.html', 'r', 'gbk') as f:
                content = f.read()

            # 将解码后的内容发送给客户端
            self.wfile.write(content.encode('utf-8'))

        except UnicodeDecodeError as e:
            # 处理解码错误
            self.send_response(500)
            self.send_header('Content-Type', 'text/plain')
            self.end_headers()
            self.wfile.write(str(e).encode('utf-8'))

        except Exception as e:
            # 处理其他异常
            self.send_response(500)
            self.send_header('Content-Type', 'text/plain')
            self.end_headers()
            self.wfile.write(str(e).encode('utf-8'))