1# Python：在请求中设置自定义用户代理
2import requests
3
4def fetch_with_user_agent(url, user_agent):
5    headers = {
6        'User-Agent': user_agent
7    }
8    response = requests.get(url, headers=headers)
9    return response.text
10
11# 示例用法
12chrome_ua = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36'
13content = fetch_with_user_agent('https://example.com', chrome_ua)
14print(content[:100])  # 打印响应的前100个字符
15

1<?php
2// PHP：使用用户代理检测移动设备
3function isMobileDevice() {
4    $userAgent = $_SERVER['HTTP_USER_AGENT'];
5    $mobileKeywords = array('Mobile', 'Android', 'iPhone', 'iPad', 'Windows Phone');
6    
7    foreach ($mobileKeywords as $keyword) {
8        if (stripos($userAgent, $keyword) !== false) {
9            return true;
10        }
11    }
12    return false;
13}
14
15// 使用
16if (isMobileDevice()) {
17    echo "您正在使用移动设备。";
18} else {
19    echo "您正在使用桌面设备。";
20}
21?>
22

1// Java：生成随机用户代理
2import java.util.Random;
3
4public class UserAgentGenerator {
5    private static final String[] CHROME_VERSIONS = {"96.0.4664.110", "95.0.4638.69", "94.0.4606.81"};
6    private static final String[] OS_VERSIONS = {"Windows NT 10.0; Win64; x64", 
7                                               "Macintosh; Intel Mac OS X 10_15_7",
8                                               "X11; Linux x86_64"};
9    
10    public static String generateRandomChromeUserAgent() {
11        Random random = new Random();
12        String osVersion = OS_VERSIONS[random.nextInt(OS_VERSIONS.length)];
13        String chromeVersion = CHROME_VERSIONS[random.nextInt(CHROME_VERSIONS.length)];
14        
15        return "Mozilla/5.0 (" + osVersion + ") AppleWebKit/537.36 (KHTML, like Gecko) " +
16               "Chrome/" + chromeVersion + " Safari/537.36";
17    }
18    
19    public static void main(String[] args) {
20        System.out.println(generateRandomChromeUserAgent());
21    }
22}
23

1# Ruby：解析用户代理字符串
2require 'user_agent_parser'
3
4def parse_user_agent(user_agent_string)
5  parser = UserAgentParser::Parser.new
6  client = parser.parse(user_agent_string)
7  
8  {
9    browser_name: client.family,
10    browser_version: client.version.to_s,
11    os_name: client.os.family,
12    os_version: client.os.version.to_s,
13    device: client.device.family
14  }
15end
16
17# 示例用法
18ua = 'Mozilla/5.0 (iPhone; CPU iPhone OS 14_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.3 Mobile/15E148 Safari/604.1'
19info = parse_user_agent(ua)
20puts info
21

1// C#：在HttpClient中设置用户代理
2using System;
3using System.Net.Http;
4using System.Threading.Tasks;
5
6class Program
7{
8    static async Task Main()
9    {
10        // 创建带有自定义用户代理的HttpClient
11        using (var httpClient = new HttpClient())
12        {
13            string userAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36";
14            httpClient.DefaultRequestHeaders.UserAgent.ParseAdd(userAgent);
15            
16            try
17            {
18                // 使用自定义用户代理发送请求
19                HttpResponseMessage response = await httpClient.GetAsync("https://example.com");
20                response.EnsureSuccessStatusCode();
21                string responseBody = await response.Content.ReadAsStringAsync();
22                
23                Console.WriteLine($"响应状态代码：{response.StatusCode}");
24                Console.WriteLine(responseBody.Substring(0, 100) + "..."); // 前100个字符
25            }
26            catch (HttpRequestException e)
27            {
28                Console.WriteLine($"请求错误：{e.Message}");
29            }
30        }
31    }
32}
33

1// Go：使用自定义用户代理创建HTTP请求
2package main
3
4import (
5    "fmt"
6    "io/ioutil"
7    "net/http"
8)
9
10func main() {
11    // 创建一个新请求
12    req, err := http.NewRequest("GET", "https://example.com", nil)
13    if err != nil {
14        fmt.Printf("创建请求时出错：%s\n", err)
15        return
16    }
17    
18    // 设置自定义用户代理
19    req.Header.Set("User-Agent", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36")
20    
21    // 发送请求
22    client := &http.Client{}
23    resp, err := client.Do(req)
24    if err != nil {
25        fmt.Printf("发送请求时出错：%s\n", err)
26        return
27    }
28    defer resp.Body.Close()
29    
30    // 读取响应
31    body, err := ioutil.ReadAll(resp.Body)
32    if err != nil {
33        fmt.Printf("读取响应时出错：%s\n", err)
34        return
35    }
36    
37    fmt.Printf("响应状态：%s\n", resp.Status)
38    fmt.Printf("响应主体预览：%s\n", body[:100])
39}
40