如何使用 golang 框架处理分布式异常？

package main

import (
    "fmt"
    "github.com/gorilla/mux"
    "log"
    "net/http"
)

func main() {
    // 创建一个 Gorilla 路由器
    r := mux.NewRouter()

    // 定义处理器函数，它将生成一个异常
    handler := func(w http.ResponseWriter, r *http.Request) {
        log.Print("Exception generated")
        http.Error(w, "Internal Server Error", http.StatusInternalServerError)
    }

    // 将处理器函数与路由相关联
    r.HandleFunc("/", handler)

    // 定义错误处理中间件
    errMiddleware := func(next http.Handler) http.Handler {
        return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
            defer func() {
                if r := recover(); r != nil {
                    log.Printf("Caught panic: %v", r)
                    w.WriteHeader(http.StatusInternalServerError)
                    fmt.Fprint(w, "Internal Server Error")
                }
            }()
            next.ServeHTTP(w, r)
        })
    }

    // 将错误处理中间件添加到路由器
    r.Use(errMiddleware)

    // 启动 HTTP 服务器
    log.Print("Starting HTTP server on port :8080")
    if err := http.ListenAndServe(":8080", r); err != nil {
        log.Fatal(err)
    }
}