Golang framework network programming common problems and solutions

Common Go framework network programming problems and solutions: Timeout issues: Set reasonable timeouts, use contexts with timeout restrictions, and set HTTP client timeouts. Connection reset issues: Make sure the network is stable, check firewall/proxy, use KeepAlive connection. DNS resolution issues: Check DNS settings, resolve the domain name directly, or use a third-party DNS service. HTTP error code handling: Understand the meaning of HTTP status codes, use context for error handling, and obtain response status codes. SSL/TLS issues: Ensure certificate is valid/link is intact, check TLS version compatibility, use self-signed certificate or skip certificate verification.

Golang framework network programming common problems and solutions

When using the Golang framework for network programming, you will always encounter various problems. This article will discuss some common network programming problems and their solutions, and provide some practical cases for reference.

1. Timeout problem

Problem: Network requests often time out.

Solution:

• Set a reasonable timeout to avoid meaningless waiting.
• Use golang.org/x/net/context to set a context with timeout restrictions.
• Use net/http.Client.Timeout to set the timeout for the HTTP client.

Practical case:

import (
    "context"
    "net/http"
    "time"
)

func main() {
    ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
    defer cancel()

    req, err := http.NewRequest("GET", "https://example.com", nil)
    if err != nil {
        // 处理错误
    }

    client := &http.Client{
        Timeout: 5 * time.Second,
    }
    resp, err := client.Do(req.WithContext(ctx))
    if err != nil {
        // 处理错误
    }
    // 处理响应
}

2. Connection reset problem

Problem: The network connection is suddenly reset .

Solution:

• Ensure that the network environment of both parties is stable.
• Check firewall or proxy settings to avoid blocking connections.
• Try to use KeepAlive connection to avoid frequent connection establishment and disconnection.

Practical case:

import (
    "golang.org/x/net/http2"
    "net/http"
)

func main() {
    http2.ConfigureTransport(&http.Transport{
        TLSClientConfig: &tls.Config{
            InsecureSkipVerify: true, // 不建议在生产环境使用
        },
    })

    client := &http.Client{
        Transport: &http2.Transport{},
    }
    resp, err := client.Get("https://example.com")
    if err != nil {
        // 处理错误
    }
    // 处理响应
}

3. DNS resolution problem

Problem: Unable to resolve the domain name.

Solution:

• Check whether the DNS server settings are correct.
• Try to use Golang’s net.LookupHost or net.LookupCNAME function to directly resolve the domain name.
• Use a third-party DNS service such as Google Public DNS (8.8.8.8).

Practical case:

import (
    "net"
)

func main() {
    ips, err := net.LookupHost("example.com")
    if err != nil {
        // 处理错误
    }
    for _, ip := range ips {
        // 使用此 IP 进行连接或其他操作
    }
}

4. HTTP error code handling

Problem: Received HTTP status code Response not equal to 200.

Solution:

• Understand the meaning of HTTP status codes and handle them according to the specific situation.
• Use golang.org/x/net/context for error handling of HTTP requests.
• Use net/http.Response.StatusCode to get the response status code.

Practical case:

import (
    "golang.org/x/net/context"
    "net/http"
)

func main() {
    ctx := context.Background()
    req, err := http.NewRequest("GET", "https://example.com", nil)
    if err != nil {
        // 处理错误
    }

    resp, err := http.DefaultClient.Do(req.WithContext(ctx))
    if err != nil {
        // 处理错误
    }

    if resp.StatusCode != 200 {
        // 根据状态码处理错误
    }
    // 处理响应
}

5. SSL/TLS problem

Problem: Establishing SSL/TLS connection fail.

Solution:

• Make sure the SSL/TLS certificate is valid and the link is intact.
• Check whether the TLS version is compatible.
• Try using a self-signed certificate or enable certificate verification skip.

Practical case:

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

func main() {
    transport := &http.Transport{
        TLSClientConfig: &tls.Config{
            InsecureSkipVerify: true, // 不建议在生产环境使用
        },
    }

    client := &http.Client{
        Transport: transport,
    }
    resp, err := client.Get("https://example.com")
    if err != nil {
        // 处理错误
    }
    // 处理响应
}

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