{"id":25,"date":"2026-02-15T21:32:48","date_gmt":"2026-02-15T13:32:48","guid":{"rendered":"http:\/\/43.138.147.217\/?p=25"},"modified":"2026-02-15T21:37:39","modified_gmt":"2026-02-15T13:37:39","slug":"%e5%9f%ba%e4%ba%8egolang%e5%ae%9e%e7%8e%b0%e5%8f%8d%e5%90%91%e4%bb%a3%e7%90%86%e6%9c%8d%e5%8a%a1%e5%99%a8%ef%bc%883%ef%bc%89%e5%81%a5%e5%ba%b7%e6%a3%80%e6%9f%a5%e4%b8%8e%e5%8a%a8%e6%80%81%e5%90%8e","status":"publish","type":"post","link":"https:\/\/fableary.top\/?p=25","title":{"rendered":"\u57fa\u4e8eGolang\u5b9e\u73b0\u53cd\u5411\u4ee3\u7406\u670d\u52a1\u5668\uff083\uff09\u5065\u5eb7\u68c0\u67e5\u4e0e\u52a8\u6001\u540e\u7aef\u7ba1\u7406"},"content":{"rendered":"\n

\u56de\u987e\u4e0e\u76ee\u6807\uff1a<\/strong><\/p>\n\n\n\n

\u5728\u4e4b\u524d\u7684\u5b9e\u73b0\u4e2d\uff0c Backend \u7ed3\u6784\u4f53\u4e2d\u5df2\u7ecf\u6709\u4e86\u4e00\u4e2a Alive \u5b57\u6bb5\uff0c\u4f46\u662f\u6211\u4eec\u4ece\u6765\u6ca1\u6709\u66f4\u65b0\u8fc7\u5b83\u3002\u6240\u6709\u540e\u7aef\u9ed8\u8ba4\u90fd\u662f Alive = true \u3002\u5982\u679c\u67d0\u4e2a\u540e\u7aef\u670d\u52a1\u6302\u4e86\uff0c\u4ee3\u7406\u4ecd\u7136\u4f1a\u628a\u8bf7\u6c42\u8f6c\u53d1\u7ed9\u5b83\uff0c\u5bfc\u81f4502\u9519\u8bef\u3002<\/p>\n\n\n\n

\u56e0\u6b64\uff0c\u5728\u672c\u7ae0\u4e2d\uff0c\u6211\u4eec\u671f\u671b\u5b9e\u73b0<\/strong>\uff1a<\/p>\n\n\n\n

    \n
  1. \u542f\u52a8\u4e00\u4e2a\u540e\u53f0 goroutine \uff0c\u5b9a\u671f\uff08\u6bd4\u5982\u6bcf5\u79d2\uff09\u5411\u6240\u6709\u540e\u7aef\u53d1\u9001\u5065\u5eb7\u68c0\u67e5\u8bf7\u6c42\u3002<\/li>\n\n\n\n
  2. \u5982\u679c\u68c0\u67e5\u6210\u529f\uff0c\u5c06\u5bf9\u5e94\u540e\u7aef\u7684 Alive \u8bbe\u4e3a true \uff1b\u5982\u679c\u5931\u8d25\uff0c\u5219\u8bbe\u4e3a false \u3002<\/li>\n\n\n\n
  3. \u4fee\u6539\u8d1f\u8f7d\u5747\u8861\u7b97\u6cd5\uff0c\u53ea\u9009\u62e9 Alive = true \u7684\u540e\u7aef\u3002\uff08\u5f53\u7136\u5728\u5b9e\u9645\u5b9e\u73b0\u4e2d\u6211\u4eec\u5c06\u5176\u6539\u4e3a Int32 \uff0c\u8fd9\u6837\u6bd4\u8f83\u597d\u5b9e\u73b0\uff09<\/li>\n\n\n\n
  4. \u786e\u4fdd\u5065\u5eb7\u68c0\u67e5\u548c\u8d1f\u8f7d\u5747\u8861\u4e4b\u95f4\u7684\u6570\u636e\u8bbf\u95ee\u662f\u5e76\u53d1\u5b89\u5168<\/strong>\u7684\u3002<\/li>\n<\/ol>\n\n\n\n

    \u4e00\u3001\u5173\u952e\u6280\u672f\u70b9<\/h3>\n\n\n\n

    1. \u5b9a\u65f6\u5668 time.Ticker<\/h4>\n\n\n\n

    time.NewTicker(duration) \u4f1a\u8fd4\u56de\u4e00\u4e2a\u901a\u9053\uff0c\u6bcf\u9694\u6307\u5b9a\u65f6\u95f4\u5c31\u4f1a\u5f80\u901a\u9053\u53d1\u9001\u4e00\u4e2a\u65f6\u95f4\u503c\u3002<\/p>\n\n\n\n

    \u5f53\u901a\u9053\u6536\u5230\u4fe1\u53f7\u65f6\uff0c\u8fdb\u884c\u5065\u5eb7\u68c0\u67e5\u3002<\/p>\n\n\n\n

    2. \u5e76\u53d1\u5b89\u5168\u5730\u66f4\u65b0 Alive<\/h4>\n\n\n\n

    Alive \u5b57\u6bb5\u4f1a\u88ab\u5065\u5eb7\u68c0\u67e5\u5730 goroutine \u5199\u5165\uff0c\u540c\u65f6\u4f1a\u88ab\u591a\u4e2a\u5904\u7406\u8bf7\u6c42\u7684 goroutine \u8bfb\u53d6\u3002\u56e0\u6b64\u5728\u8fd9\u91cc\u9700\u8981\u4f7f\u7528\u539f\u5b50\u64cd\u4f5c<\/strong>\u3002<\/p>\n\n\n\n

    \u4e8c\u3001\u5b9e\u73b0\u5065\u5eb7\u68c0\u67e5<\/h3>\n\n\n\n

    1. \u6dfb\u52a0\u5065\u5eb7\u68c0\u67e5\u8f85\u52a9\u65b9\u6cd5<\/h4>\n\n\n\n

    \u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n

    func (b *Backend) IsAlive() bool {\n\treturn atomic.LoadInt32(&b.Alive) == 1\n}\n\nfunc (b *Backend) SetAlive(alive bool) {\n\tif alive {\n\t\tatomic.StoreInt32(&b.Alive, 1)\n\t} else {\n\t\tatomic.StoreInt32(&b.Alive, 0)\n\t}\n}<\/code><\/pre>\n\n\n\n
    2. \u4fee\u6539\u8d1f\u8f7d\u5747\u8861\u7b97\u6cd5\uff0c\u53ea\u8fd4\u56de\u5b58\u6d3b\u7684\u8282\u70b9<\/h4>\n\n\n\n
    \u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
    \/\/ \u8f6e\u8be2\nfunc (lb *LoadBalancer) NextRoundRobin() *Backend {\n\tlb.mu.RLock()\n\tdefer lb.mu.RUnlock()\n\n\tn := len(lb.backends)\n\tif n == 0 {\n\t\treturn nil\n\t}\n\n\tstart := atomic.AddUint64(&lb.current, 1) % uint64(n)\n\tfor i := 0; i < n; i++ {\n\t\tidx := (int(start) + i) % n\n\t\tbackend := lb.backends[idx]\n\t\tif backend.IsAlive() {\n\t\t\treturn backend\n\t\t}\n\t}\n\treturn nil\n}\n\n\/\/ \u968f\u673a\nfunc (lb *LoadBalancer) NextRandom() *Backend {\n\tlb.mu.RLock()\n\tdefer lb.mu.RUnlock()\n\n\tn := len(lb.backends)\n\tif n == 0 {\n\t\treturn nil\n\t}\n\n\t\/\/ \u6700\u591a\u5c1d\u8bd5 n \u6b21\n\tfor i := 0; i < n; i++ {\n\t\tlb.randMu.Lock()\n\t\tidx := lb.randSrc.Intn(n)\n\t\tlb.randMu.Unlock()\n\t\tbackend := lb.backends[idx]\n\t\tif backend.IsAlive() {\n\t\t\treturn backend\n\t\t}\n\t}\n\treturn nil\n}\n\n\/\/ \u6700\u5c11\u8fde\u63a5\u6570\nfunc (lb *LoadBalancer) NextLeastConnections() *Backend {\n\tlb.mu.RLock()\n\tdefer lb.mu.RUnlock()\n\n\tvar selected *Backend\n\tvar minConns int64 = 1<<63 - 1\n\n\tfor _, b := range lb.backends {\n\t\tif !b.IsAlive() {\n\t\t\tcontinue\n\t\t}\n\t\tconns := atomic.LoadInt64(&b.Connections)\n\t\tif conns < minConns {\n\t\t\tminConns = conns\n\t\t\tselected = b\n\t\t}\n\t}\n\treturn selected\n}\n\n\/\/ IP \u54c8\u5e0c\nfunc (lb *LoadBalancer) NextIPHash(ip string) *Backend {\n\tlb.mu.RLock()\n\tdefer lb.mu.RUnlock()\n\n\tn := len(lb.backends)\n\tif n == 0 {\n\t\treturn nil\n\t}\n\n\th := fnv.New32a()\n\th.Write([]byte(ip))\n\thash := h.Sum32()\n\tidx := int(hash) % n\n\n\t\/\/ \u5982\u679c\u9009\u4e2d\u7684\u540e\u7aef\u4e0d\u5b58\u6d3b\uff0c\u53ef\u4ee5\u5c1d\u8bd5\u7ebf\u6027\u63a2\u6d4b\u4e0b\u4e00\u4e2a\u5b58\u6d3b\u7684\u540e\u7aef\n\tfor i := 0; i < n; i++ {\n\t\tcandidate := lb.backends[(idx+i)%n]\n\t\tif candidate.IsAlive() {\n\t\t\treturn candidate\n\t\t}\n\t}\n\treturn nil\n}<\/code><\/pre>\n\n\n\n
    3. \u6dfb\u52a0\u5065\u5eb7\u68c0\u67e5\u65b9\u6cd5<\/h4>\n\n\n\n
    \u5728 LoadBalancer \u4e0a\u6dfb\u52a0\u4e00\u4e2a StartHealthCheck \u65b9\u6cd5\uff0c\u542f\u52a8\u540e\u53f0 goroutine \u3002<\/p>\n\n\n\n
    \u540c\u65f6\uff0c\u4e3a\u4e86\u5728\u7a0b\u5e8f\u9000\u51fa\u65f6\u80fd\u591f\u6b63\u786e\u5730\u505c\u6b62\u540e\u53f0 goroutine \uff0c \u6211\u4eec\u53ef\u4ee5\u7ed9 LoadBalancer \u589e\u52a0\u4e00\u4e2a\u505c\u6b62\u901a\u9053\u3002<\/p>\n\n\n\n
    \u6ce8\u610f\uff1a<\/strong>\u5065\u5eb7\u68c0\u67e5\u7684\u8def\u5f84 \/health \u53ea\u662f\u4e00\u4e2a\u4f8b\u5b50\uff0c\u5b9e\u9645\u540e\u7aef\u4e2d\u53ef\u80fd\u63d0\u4f9b\u4e0d\u540c\u7684\u5065\u5eb7\u68c0\u67e5\u63a5\u53e3\uff0c\u4e5f\u53ef\u4ee5\u8bbe\u8ba1\u6210\u5141\u8bb8\u914d\u7f6e\u3002<\/p>\n\n\n\n
    func (lb *LoadBalancer) StartHealthCheck(interval time.Duration) {\n\tgo func() {\n\t\tticker := time.NewTicker(interval)\n\t\tdefer ticker.Stop()\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ticker.C:\n\t\t\t\tlb.healthCheck()\n\t\t\tcase <-lb.stopChan:\n\t\t\t\treturn\n\t\t\t}\n\t\t}\n\t}()\n}\n\nfunc (lb *LoadBalancer) Stop() {\n\tclose(lb.stopChan)\n}\n\nfunc (lb *LoadBalancer) healthCheck() {\n\tlb.mu.RLock()\n\tbackends := lb.backends\n\tlb.mu.RUnlock()\n\n\tvar wg sync.WaitGroup\n\tfor _, b := range backends {\n\t\twg.Add(1)\n\t\tgo func(backend *Backend) {\n\t\t\tdefer wg.Done()\n\t\t\talive := checkBackendHealth(backend.URL)\n\t\t\tbackend.SetAlive(alive)\n\t\t\tif !alive {\n\t\t\t\tlog.Printf(\"Backend %s is DOWN\", backend.URL.String())\n\t\t\t} else {\n\t\t\t\t\/\/ \u53ef\u4ee5\u8bb0\u5f55\u6062\u590d\u65e5\u5fd7\uff0c\u4f46\u907f\u514d\u592a\u591a\n\t\t\t\t\/\/ log.Printf(\"Backend %s is UP\", backend.URL.String())\n\t\t\t}\n\t\t}(b)\n\t}\n\twg.Wait()\n}\n\nfunc checkBackendHealth(u *url.URL) bool {\n\tclient := http.Client{\n\t\tTimeout: 2 * time.Second,\n\t}\n\t\/\/ \u5047\u8bbe\u5065\u5eb7\u68c0\u67e5\u8def\u5f84\u4e3a \/health\n\thealthURL := u.ResolveReference(&url.URL{Path: \"\/health\"})\n\tresp, err := client.Head(healthURL.String())\n\tif err != nil {\n\t\treturn false\n\t}\n\tdefer resp.Body.Close()\n\treturn resp.StatusCode >= 200 && resp.StatusCode < 300\n}<\/code><\/pre>\n\n\n\n
    \u4e09\u3001\u91cd\u70b9\u4ee3\u7801\u89e3\u6790<\/h3>\n\n\n\n
    \u5728\u5065\u5eb7\u68c0\u67e5\u90e8\u5206\u4e2d\uff0c\u6709\u5982\u4e0b\u4ee3\u7801\uff1a<\/p>\n\n\n\n
    for {\n    select {\n    case <-ticker.C:\n        lb.healthCheck()   \/\/ \u5b9a\u65f6\u5668\u89e6\u53d1\u65f6\uff0c\u6267\u884c\u5065\u5eb7\u68c0\u67e5\n    case <-lb.stopChan:\n        return             \/\/ \u6536\u5230\u505c\u6b62\u4fe1\u53f7\u65f6\uff0c\u9000\u51fa\u5faa\u73af\n    }\n}<\/code><\/pre>\n\n\n\n
      \n
    • case <-ticker.C<\/code>\uff1a\u7b49\u5f85 ticker \u7684\u5b9a\u65f6\u4fe1\u53f7\uff0c\u7136\u540e\u505a\u5065\u5eb7\u68c0\u67e5\u3002<\/li>\n\n\n\n
    • case <-lb.stopChan<\/code>\uff1a\u7b49\u5f85\u505c\u6b62\u4fe1\u53f7\uff0c\u4e00\u65e6\u6536\u5230\uff08\u901a\u9053\u88ab\u5173\u95ed\uff09\uff0c\u7acb\u5373\u9000\u51fa\u5faa\u73af\uff0cgoroutine \u7ed3\u675f\u3002<\/li>\n<\/ul>\n\n\n\n
      select<\/code> \u4f1a\u963b\u585e<\/strong>\u76f4\u5230\u5176\u4e2d\u4e00\u4e2a case<\/code> \u53ef\u4ee5\u6267\u884c\u3002\u5982\u679c\u591a\u4e2a case<\/code> \u540c\u65f6\u6ee1\u8db3\uff0c\u4f1a\u968f\u673a\u9009\u62e9\u4e00\u4e2a\u3002<\/p>\n\n\n\n
      \u56db\u3001\u5b8c\u6574\u793a\u4f8b\u4ee3\u7801<\/h3>\n\n\n\n
      \u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
      package main\n\nimport (\n\t\"hash\/fnv\"\n\t\"io\"\n\t\"log\"\n\t\"math\/rand\"\n\t\"net\"\n\t\"net\/http\"\n\t\"net\/url\"\n\t\"sync\"\n\t\"sync\/atomic\"\n\t\"time\"\n)\n\ntype Backend struct {\n\tURL         *url.URL\n\tAlive       int32 \/\/ 1=\u5b58\u6d3b\uff0c0=\u4e0d\u5b58\u6d3b\n\tConnections int64\n}\n\nfunc (b *Backend) IsAlive() bool {\n\treturn atomic.LoadInt32(&b.Alive) == 1\n}\n\nfunc (b *Backend) SetAlive(alive bool) {\n\tif alive {\n\t\tatomic.StoreInt32(&b.Alive, 1)\n\t} else {\n\t\tatomic.StoreInt32(&b.Alive, 0)\n\t}\n}\n\ntype LoadBalancer struct {\n\tbackends []*Backend\n\tcurrent  uint64\n\tmu       sync.RWMutex\n\tstopChan chan struct{}\n\trandSrc  *rand.Rand\n\trandMu   sync.Mutex\n}\n\nfunc NewLoadBalancer(urls []string) *LoadBalancer {\n\tvar backends []*Backend\n\tfor _, u := range urls {\n\t\tparsed, _ := url.Parse(u)\n\t\tbackends = append(backends, &Backend{\n\t\t\tURL:         parsed,\n\t\t\tAlive:       1, \/\/ \u9ed8\u8ba4\u5b58\u6d3b\n\t\t\tConnections: 0,\n\t\t})\n\t}\n\treturn &LoadBalancer{\n\t\tbackends: backends,\n\t\tcurrent:  0,\n\t\tstopChan: make(chan struct{}),\n\t\trandSrc:  rand.New(rand.NewSource(time.Now().UnixNano())),\n\t}\n}\n\n\/\/ \u8f6e\u8be2\nfunc (lb *LoadBalancer) NextRoundRobin() *Backend {\n\tlb.mu.RLock()\n\tdefer lb.mu.RUnlock()\n\n\tn := len(lb.backends)\n\tif n == 0 {\n\t\treturn nil\n\t}\n\n\tstart := atomic.AddUint64(&lb.current, 1) % uint64(n)\n\tfor i := 0; i < n; i++ {\n\t\tidx := (int(start) + i) % n\n\t\tbackend := lb.backends[idx]\n\t\tif backend.IsAlive() {\n\t\t\treturn backend\n\t\t}\n\t}\n\treturn nil\n}\n\n\/\/ \u968f\u673a\nfunc (lb *LoadBalancer) NextRandom() *Backend {\n\tlb.mu.RLock()\n\tdefer lb.mu.RUnlock()\n\n\tn := len(lb.backends)\n\tif n == 0 {\n\t\treturn nil\n\t}\n\n\t\/\/ \u6700\u591a\u5c1d\u8bd5 n \u6b21\n\tfor i := 0; i < n; i++ {\n\t\tlb.randMu.Lock()\n\t\tidx := lb.randSrc.Intn(n)\n\t\tlb.randMu.Unlock()\n\t\tbackend := lb.backends[idx]\n\t\tif backend.IsAlive() {\n\t\t\treturn backend\n\t\t}\n\t}\n\treturn nil\n}\n\n\/\/ \u6700\u5c11\u8fde\u63a5\u6570\nfunc (lb *LoadBalancer) NextLeastConnections() *Backend {\n\tlb.mu.RLock()\n\tdefer lb.mu.RUnlock()\n\n\tvar selected *Backend\n\tvar minConns int64 = 1<<63 - 1\n\n\tfor _, b := range lb.backends {\n\t\tif !b.IsAlive() {\n\t\t\tcontinue\n\t\t}\n\t\tconns := atomic.LoadInt64(&b.Connections)\n\t\tif conns < minConns {\n\t\t\tminConns = conns\n\t\t\tselected = b\n\t\t}\n\t}\n\treturn selected\n}\n\n\/\/ IP \u54c8\u5e0c\nfunc (lb *LoadBalancer) NextIPHash(ip string) *Backend {\n\tlb.mu.RLock()\n\tdefer lb.mu.RUnlock()\n\n\tn := len(lb.backends)\n\tif n == 0 {\n\t\treturn nil\n\t}\n\n\th := fnv.New32a()\n\th.Write([]byte(ip))\n\thash := h.Sum32()\n\tidx := int(hash) % n\n\n\t\/\/ \u5982\u679c\u9009\u4e2d\u7684\u540e\u7aef\u4e0d\u5b58\u6d3b\uff0c\u53ef\u4ee5\u5c1d\u8bd5\u7ebf\u6027\u63a2\u6d4b\u4e0b\u4e00\u4e2a\u5b58\u6d3b\u7684\u540e\u7aef\n\tfor i := 0; i < n; i++ {\n\t\tcandidate := lb.backends[(idx+i)%n]\n\t\tif candidate.IsAlive() {\n\t\t\treturn candidate\n\t\t}\n\t}\n\treturn nil\n}\n\n\/\/ \u5065\u5eb7\u68c0\u67e5\nfunc (lb *LoadBalancer) StartHealthCheck(interval time.Duration) {\n\tgo func() {\n\t\tticker := time.NewTicker(interval)\n\t\tdefer ticker.Stop()\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ticker.C:\n\t\t\t\tlb.healthCheck()\n\t\t\tcase <-lb.stopChan:\n\t\t\t\treturn\n\t\t\t}\n\t\t}\n\t}()\n}\n\nfunc (lb *LoadBalancer) Stop() {\n\tclose(lb.stopChan)\n}\n\nfunc (lb *LoadBalancer) healthCheck() {\n\tlb.mu.RLock()\n\tbackends := lb.backends\n\tlb.mu.RUnlock()\n\n\tvar wg sync.WaitGroup\n\tfor _, b := range backends {\n\t\twg.Add(1)\n\t\tgo func(backend *Backend) {\n\t\t\tdefer wg.Done()\n\t\t\talive := checkBackendHealth(backend.URL)\n\t\t\tbackend.SetAlive(alive)\n\t\t\tif !alive {\n\t\t\t\tlog.Printf(\"Backend %s is DOWN\", backend.URL.String())\n\t\t\t} else {\n\t\t\t\t\/\/ \u53ef\u4ee5\u8bb0\u5f55\u6062\u590d\u65e5\u5fd7\uff0c\u4f46\u907f\u514d\u592a\u591a\n\t\t\t\t\/\/ log.Printf(\"Backend %s is UP\", backend.URL.String())\n\t\t\t}\n\t\t}(b)\n\t}\n\twg.Wait()\n}\n\nfunc checkBackendHealth(u *url.URL) bool {\n\tclient := http.Client{\n\t\tTimeout: 2 * time.Second,\n\t}\n\t\/\/ \u5047\u8bbe\u5065\u5eb7\u68c0\u67e5\u8def\u5f84\u4e3a \/health\n\thealthURL := u.ResolveReference(&url.URL{Path: \"\/health\"})\n\tresp, err := client.Head(healthURL.String())\n\tif err != nil {\n\t\treturn false\n\t}\n\tdefer resp.Body.Close()\n\treturn resp.StatusCode >= 200 && resp.StatusCode < 300\n}\n\n\/\/ \u53cd\u5411\u4ee3\u7406\u5904\u7406\u5668\nfunc ReverseProxy(lb *LoadBalancer, strategy string) http.HandlerFunc {\n\treturn func(w http.ResponseWriter, r *http.Request) {\n\t\tvar backend *Backend\n\t\tswitch strategy {\n\t\tcase \"round-robin\":\n\t\t\tbackend = lb.NextRoundRobin()\n\t\tcase \"random\":\n\t\t\tbackend = lb.NextRandom()\n\t\tcase \"least-conn\":\n\t\t\tbackend = lb.NextLeastConnections()\n\t\tcase \"ip-hash\":\n\t\t\tip, _, _ := net.SplitHostPort(r.RemoteAddr)\n\t\t\tbackend = lb.NextIPHash(ip)\n\t\tdefault:\n\t\t\thttp.Error(w, \"unknown strategy\", http.StatusInternalServerError)\n\t\t\treturn\n\t\t}\n\n\t\tif backend == nil {\n\t\t\thttp.Error(w, \"no available backend\", http.StatusServiceUnavailable)\n\t\t\treturn\n\t\t}\n\n\t\tatomic.AddInt64(&backend.Connections, 1)\n\t\tdefer atomic.AddInt64(&backend.Connections, -1)\n\n\t\tproxyURL := backend.URL.ResolveReference(r.URL)\n\t\treq, err := http.NewRequest(r.Method, proxyURL.String(), r.Body)\n\t\tif err != nil {\n\t\t\thttp.Error(w, err.Error(), http.StatusInternalServerError)\n\t\t\treturn\n\t\t}\n\n\t\treq.Header = r.Header.Clone()\n\t\treq.Host = backend.URL.Host\n\n\t\tclient := http.DefaultClient\n\t\tresp, err := client.Do(req)\n\t\tif err != nil {\n\t\t\thttp.Error(w, err.Error(), http.StatusBadGateway)\n\t\t\treturn\n\t\t}\n\t\tdefer resp.Body.Close()\n\n\t\tfor key, values := range resp.Header {\n\t\t\tfor _, value := range values {\n\t\t\t\tw.Header().Add(key, value)\n\t\t\t}\n\t\t}\n\t\tw.WriteHeader(resp.StatusCode)\n\t\tio.Copy(w, resp.Body)\n\t}\n}\n\nfunc main() {\n\tbackendURLs := []string{\n\t\t\"http:\/\/127.0.0.1:8001\",\n\t\t\"http:\/\/127.0.0.1:8002\",\n\t\t\"http:\/\/127.0.0.1:8003\",\n\t}\n\tlb := NewLoadBalancer(backendURLs)\n\n\t\/\/ \u542f\u52a8\u5065\u5eb7\u68c0\u67e5\uff0c\u6bcf 5 \u79d2\u4e00\u6b21\n\tlb.StartHealthCheck(5 * time.Second)\n\n\tstrategy := \"round-robin\" \/\/ \u53ef\u4ee5\u6539\u6210\u5176\u4ed6\u7b56\u7565\u6d4b\u8bd5\n\n\thttp.HandleFunc(\"\/\", ReverseProxy(lb, strategy))\n\n\tlog.Println(\"Starting proxy server on :8080\")\n\tlog.Fatal(http.ListenAndServe(\":8080\", nil))\n}<\/code><\/pre>\n\n\n\n
      <\/p>\n","protected":false},"excerpt":{"rendered":"
      \u56de\u987e\u4e0e\u76ee\u6807\uff1a \u5728\u4e4b\u524d\u7684\u5b9e\u73b0\u4e2d\uff0c Backend \u7ed3\u6784\u4f53\u4e2d\u5df2\u7ecf\u6709\u4e86\u4e00\u4e2a Alive \u5b57\u6bb5\uff0c\u4f46\u662f\u6211\u4eec\u4ece\u6765\u6ca1\u6709\u66f4\u65b0\u8fc7 … \u9605\u8bfb\u66f4\u591a<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-25","post","type-post","status-publish","format-standard","hentry","category-golangproxy"],"_links":{"self":[{"href":"https:\/\/fableary.top\/index.php?rest_route=\/wp\/v2\/posts\/25","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fableary.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fableary.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fableary.top\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/fableary.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=25"}],"version-history":[{"count":1,"href":"https:\/\/fableary.top\/index.php?rest_route=\/wp\/v2\/posts\/25\/revisions"}],"predecessor-version":[{"id":26,"href":"https:\/\/fableary.top\/index.php?rest_route=\/wp\/v2\/posts\/25\/revisions\/26"}],"wp:attachment":[{"href":"https:\/\/fableary.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=25"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fableary.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fableary.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}