Golang中解决F5 bigip请求头等待超时问题（Context Deadline Exceeded）

这个错误通常是由于客户端等待服务器响应头的时间超过了设置的超时时间。在Go中，你可以通过配置HTTP客户端的超时设置来解决这个问题。以下是针对这两个包的解决方案：

对于 go-bigip 包：

package main

import (
    "crypto/tls"
    "fmt"
    "net/http"
    "time"
    "github.com/scottdware/go-bigip"
)

func main() {
    // 创建自定义的HTTP客户端
    tr := &http.Transport{
        TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
        MaxIdleConns: 10,
        IdleConnTimeout: 30 * time.Second,
    }
    
    client := &http.Client{
        Transport: tr,
        Timeout: 30 * time.Second, // 设置总超时时间
    }
    
    config := bigip.ConfigOptions{
        APICallTimeout: 30000, // 30秒
        HTTPClient: client,    // 传入自定义HTTP客户端
    }
    
    f5 := bigip.NewSession("https://<f5-ipaddress>", "username", "password", &config)
    
    vservers, err := f5.VirtualServers()
    if err != nil {
        fmt.Println("Error:", err)
        return
    }
    
    fmt.Println(vservers)
}

对于 f5-rest-client 包：

package main

import (
    "crypto/tls"
    "fmt"
    "net/http"
    "time"
    "github.com/e-XpertSolutions/f5-rest-client/f5"
    "github.com/e-XpertSolutions/f5-rest-client/f5/ltm"
)

func main() {
    // 创建自定义的HTTP客户端
    tr := &http.Transport{
        TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
        MaxIdleConns: 10,
        IdleConnTimeout: 30 * time.Second,
        ResponseHeaderTimeout: 15 * time.Second, // 专门设置响应头超时
    }
    
    client := &http.Client{
        Transport: tr,
        Timeout: 30 * time.Second,
    }
    
    // 使用自定义HTTP客户端创建F5客户端
    f5Client, err := f5.NewClient("https://<f5-ipaddress>", "username", "password", client)
    if err != nil {
        fmt.Println(err)
        return
    }
    
    ltmClient := ltm.New(f5Client)
    
    vsConfigList, err := ltmClient.Virtual().ListAll()
    if err != nil {
        fmt.Println(err)
        return
    }
    
    fmt.Println(vsConfigList)
}

通用解决方案 - 创建可重用的HTTP客户端工厂函数：

package main

import (
    "crypto/tls"
    "net/http"
    "time"
)

func createF5HTTPClient() *http.Client {
    return &http.Client{
        Transport: &http.Transport{
            TLSClientConfig: &tls.Config{
                InsecureSkipVerify: true, // 跳过证书验证
            },
            MaxIdleConns:        10,
            IdleConnTimeout:     30 * time.Second,
            ResponseHeaderTimeout: 20 * time.Second, // 关键：设置响应头等待超时
            ExpectContinueTimeout: 1 * time.Second,
            TLSHandshakeTimeout:   10 * time.Second,
        },
        Timeout: 45 * time.Second, // 总超时时间
    }
}

// 使用示例
func main() {
    httpClient := createF5HTTPClient()
    
    // 对于 go-bigip
    config := bigip.ConfigOptions{
        APICallTimeout: 45000,
        HTTPClient: httpClient,
    }
    
    // 对于 f5-rest-client
    f5Client, err := f5.NewClient("https://<f5-ipaddress>", "username", "password", httpClient)
    // ... 后续代码
}

调试版本 - 添加详细日志：

package main

import (
    "crypto/tls"
    "fmt"
    "log"
    "net/http"
    "net/http/httputil"
    "time"
)

type loggingTransport struct {
    transport http.RoundTripper
}

func (t *loggingTransport) RoundTrip(req *http.Request) (*http.Response, error) {
    // 记录请求
    dump, _ := httputil.DumpRequestOut(req, true)
    log.Printf("Request:\n%s", dump)
    
    start := time.Now()
    resp, err := t.transport.RoundTrip(req)
    elapsed := time.Since(start)
    
    if err != nil {
        log.Printf("Request failed after %v: %v", elapsed, err)
    } else {
        log.Printf("Request completed in %v", elapsed)
    }
    
    return resp, err
}

func createDebugHTTPClient() *http.Client {
    baseTransport := &http.Transport{
        TLSClientConfig: &tls.Config{
            InsecureSkipVerify: true,
        },
        ResponseHeaderTimeout: 25 * time.Second,
        TLSHandshakeTimeout:   10 * time.Second,
    }
    
    return &http.Client{
        Transport: &loggingTransport{transport: baseTransport},
        Timeout: 60 * time.Second,
    }
}

关键点：

1. ResponseHeaderTimeout 是解决 “awaiting headers” 错误的关键参数
2. 适当增加超时时间（F5设备响应可能较慢）
3. 考虑网络延迟和设备负载情况调整超时值
4. 使用自定义HTTP客户端可以更精细地控制连接行为