# 1.2 Go 的 fake-useragent 了解一下

有的网站会根据 User-Agent 的不同，跳转到不同（PC、M）的站点，也有根据版本的不同给出不一样的提示等等，而 User-Agent 的变化更是爬虫里的基础姿势

使用 Go 编写网络爬虫或需要模拟浏览器头（User-Agent）的时候，你是否会觉得很麻烦，获取请求头（Request Headers）的 User-Agent 还得找来找去，挺繁琐。先前我也遇到了这个问题，因此有了这个项目 [fake-useragent](https://github.com/EDDYCJY/fake-useragent)，用来解决你我的痛点

项目地址：<https://github.com/EDDYCJY/fake-useragent>

## 支持

* All User-Agent Random
* Chrome
* InternetExplorer (IE)
* Firefox
* Safari
* Android
* MacOSX
* IOS
* Linux
* IPhone
* IPad
* Computer
* Mobile

## 安装

```
$ go get github.com/EDDYCJY/fake-useragent
```

## 用法

```go
package main

import (
    "log"

    "github.com/EDDYCJY/fake-useragent"
)

func main() {
    // 推荐使用
    random := browser.Random()
    log.Printf("Random: %s", random)

    chrome := browser.Chrome()
    log.Printf("Chrome: %s", chrome)

    internetExplorer := browser.InternetExplorer()
    log.Printf("IE: %s", internetExplorer)

    firefox := browser.Firefox()
    log.Printf("Firefox: %s", firefox)

    safari := browser.Safari()
    log.Printf("Safari: %s", safari)

    android := browser.Android()
    log.Printf("Android: %s", android)

    macOSX := browser.MacOSX()
    log.Printf("MacOSX: %s", macOSX)

    ios := browser.IOS()
    log.Printf("IOS: %s", ios)

    linux := browser.Linux()
    log.Printf("Linux: %s", linux)

    iphone := browser.IPhone()
    log.Printf("IPhone: %s", iphone)

    ipad := browser.IPad()
    log.Printf("IPad: %s", ipad)

    computer := browser.Computer()
    log.Printf("Computer: %s", computer)

    mobile := browser.Mobile()
    log.Printf("Mobile: %s", mobile)
}
```

### 定制

你可以调整抓取数据源的最大页数、时间间隔以及最大超时时间。 如果不填写，则为默认值。

```go
client := browser.Client{
    MaxPage: 3,
    Delay: 200 * time.Millisecond,
    Timeout: 10 * time.Second,
}
cache := browser.Cache{}
b := browser.NewBrowser(client, cache)

random := b.Random()
```

更新浏览器头的临时文件缓存

```go
client := browser.Client{}
cache := browser.Cache{
    UpdateFile: true,
}
b := browser.NewBrowser(client, cache)
```

**最后，建议常规用法就好，默认参数能够满足日常需求**

## 输出

```bash
Random: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36

Chrome: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36

IE: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)

Firefox: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:41.0) Gecko/20100101 Firefox/41.0

Safari: Mozilla/5.0 (iPhone; CPU iPhone OS 11_2_5 like Mac OS X) AppleWebKit/604.5.6 (KHTML, like Gecko) Version/11.0 Mobile/15D60 Safari/604.1

Android: Mozilla/5.0 (Linux; Android 6.0; MYA-L22 Build/HUAWEIMYA-L22) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.84 Mobile Safari/537.36

MacOSX: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/602.2.14 (KHTML, like Gecko) Version/10.0.1 Safari/602.2.14

IOS: Mozilla/5.0 (iPhone; CPU iPhone OS 10_1 like Mac OS X) AppleWebKit/602.2.14 (KHTML, like Gecko) Version/10.0 Mobile/14B72 Safari/602.1

Linux: Mozilla/5.0 (X11; Linux x86_64; rv:42.0) Gecko/20100101 Firefox/42.0

IPhone: Mozilla/5.0 (iPhone; CPU iPhone OS 10_2 like Mac OS X) AppleWebKit/602.3.12 (KHTML, like Gecko) Version/10.0 Mobile/14C92 Safari/602.1

IPad: Mozilla/5.0 (iPad; CPU OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3

Computer: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0

Mobile: Mozilla/5.0 (Linux; Android 7.0; Redmi Note 4 Build/NRD90M) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.111 Mobile Safari/537.36
```

## 注意

如果第一次使用，[fake-useragent](https://github.com/EDDYCJY/fake-useragent) 将收集数据并在临时目录中创建一个文件作为文件缓存，请耐心等待几秒钟

## 最后

如果在项目中发现了什么问题，欢迎提交 PR 或者 issue。希望你能够喜欢这个项目，根本目的还是为了解决痛点，欢迎 Star！😁

项目地址：<https://github.com/EDDYCJY/fake-useragent>


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