> For the complete documentation index, see [llms.txt](https://developers.oxylabs.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.oxylabs.io/products/cn/dai-li/datacenter-proxies/select-country.md).

# 选择国家

如果你想访问特定位置的 IP，你必须提供一个 `国家` – 参数，在你的用户名中使用两个字母的国家代码。以下是 `国家` 参数列表。例如，如果你想使用美国国家参数，添加 `country-US`.

在下表中查看支持的国家完整列表。 

<details>

<summary>Datacenter per IP 支持的国家列表</summary>

<table><thead><tr><th>国家</th><th>国家代码</th><th data-hidden></th></tr></thead><tbody><tr><td>阿根廷</td><td><code>country-AR</code></td><td></td></tr><tr><td>澳大利亚</td><td><code>country-AU</code></td><td></td></tr><tr><td>奥地利</td><td><code>country-AT</code></td><td></td></tr><tr><td>比利时</td><td><code>country-BE</code></td><td></td></tr><tr><td>巴西</td><td><code>country-BR</code></td><td></td></tr><tr><td>加拿大</td><td><code>country-CA</code></td><td></td></tr><tr><td>智利</td><td><code>country-CL</code></td><td></td></tr><tr><td>中国</td><td><code>country-CN</code></td><td></td></tr><tr><td>哥伦比亚</td><td><code>country-CO</code></td><td></td></tr><tr><td>克罗地亚</td><td><code>country-HR</code></td><td></td></tr><tr><td>捷克共和国</td><td><code>country-CZ</code></td><td></td></tr><tr><td>丹麦</td><td><code>country-DK</code></td><td></td></tr><tr><td>芬兰</td><td><code>country-FI</code></td><td></td></tr><tr><td>法国</td><td><code>country-FR</code></td><td></td></tr><tr><td>德国</td><td><code>country-DE</code></td><td></td></tr><tr><td>印度</td><td><code>country-IN</code></td><td></td></tr><tr><td>印度尼西亚</td><td><code>country-ID</code></td><td></td></tr><tr><td>爱尔兰</td><td><code>country-IE</code></td><td></td></tr><tr><td>以色列</td><td><code>country-IL</code></td><td></td></tr><tr><td>意大利</td><td><code>country-IT</code></td><td></td></tr><tr><td>日本</td><td><code>country-JP</code></td><td></td></tr><tr><td>墨西哥</td><td><code>country-MX</code></td><td></td></tr><tr><td>荷兰</td><td><code>country-NL</code></td><td></td></tr><tr><td>秘鲁</td><td><code>country-PE</code></td><td></td></tr><tr><td>菲律宾</td><td><code>country-PH</code></td><td></td></tr><tr><td>波兰</td><td><code>country-PL</code></td><td></td></tr><tr><td>葡萄牙</td><td><code>country-PT</code></td><td></td></tr><tr><td>罗马尼亚</td><td><code>country-RO</code></td><td></td></tr><tr><td>沙特阿拉伯</td><td><code>country-SA</code></td><td></td></tr><tr><td>新加坡</td><td><code>country-SG</code></td><td></td></tr><tr><td>斯洛伐克</td><td><code>country-SK</code></td><td></td></tr><tr><td>西班牙</td><td><code>country-ES</code></td><td></td></tr><tr><td>瑞士</td><td><code>country-CH</code></td><td></td></tr><tr><td>泰国</td><td><code>country-TH</code></td><td></td></tr><tr><td>阿拉伯联合酋长国</td><td><code>country-AE</code></td><td></td></tr><tr><td>英国</td><td><code>country-GB</code></td><td></td></tr><tr><td>美国</td><td><code>country-US</code></td><td></td></tr></tbody></table>

</details>

<details>

<summary>按流量支持的数据中心国家列表</summary>

<table><thead><tr><th>国家</th><th>国家代码</th><th data-hidden></th></tr></thead><tbody><tr><td>阿根廷</td><td><code>country-AR</code></td><td></td></tr><tr><td>澳大利亚</td><td><code>country-AU</code></td><td></td></tr><tr><td>奥地利</td><td><code>country-AT</code></td><td></td></tr><tr><td>比利时</td><td><code>country-BE</code></td><td></td></tr><tr><td>巴西</td><td><code>country-BR</code></td><td></td></tr><tr><td>加拿大</td><td><code>country-CA</code></td><td></td></tr><tr><td>智利</td><td><code>country-CL</code></td><td></td></tr><tr><td>中国</td><td><code>country-CN</code></td><td></td></tr><tr><td>哥伦比亚</td><td><code>country-CO</code></td><td></td></tr><tr><td>克罗地亚</td><td><code>country-HR</code></td><td></td></tr><tr><td>丹麦</td><td><code>country-DK</code></td><td></td></tr><tr><td>爱沙尼亚</td><td><code>country-EE</code></td><td></td></tr><tr><td>芬兰</td><td><code>country-FI</code></td><td></td></tr><tr><td>法国</td><td><code>country-FR</code></td><td></td></tr><tr><td>德国</td><td><code>country-DE</code></td><td></td></tr><tr><td>希腊</td><td><code>country-GR</code></td><td></td></tr><tr><td>匈牙利</td><td><code>country-HU</code></td><td></td></tr><tr><td>印度</td><td><code>country-IN</code></td><td></td></tr><tr><td>印度尼西亚</td><td><code>country-ID</code></td><td></td></tr><tr><td>爱尔兰</td><td><code>country-IE</code></td><td></td></tr><tr><td>以色列</td><td><code>country-IL</code></td><td></td></tr><tr><td>意大利</td><td><code>country-IT</code></td><td></td></tr><tr><td>日本</td><td><code>country-JP</code></td><td></td></tr><tr><td>拉脱维亚</td><td><code>country-LV</code></td><td></td></tr><tr><td>立陶宛</td><td><code>country-LT</code></td><td></td></tr><tr><td>墨西哥</td><td><code>country-MX</code></td><td></td></tr><tr><td>荷兰</td><td><code>country-NL</code></td><td></td></tr><tr><td>新西兰</td><td><code>country-NZ</code></td><td></td></tr><tr><td>挪威</td><td><code>country-NO</code></td><td></td></tr><tr><td>秘鲁</td><td><code>country-PE</code></td><td></td></tr><tr><td>波兰</td><td><code>country-PL</code></td><td></td></tr><tr><td>葡萄牙</td><td><code>country-PT</code></td><td></td></tr><tr><td>罗马尼亚</td><td><code>country-RO</code></td><td></td></tr><tr><td>沙特阿拉伯</td><td><code>country-SA</code></td><td></td></tr><tr><td>新加坡</td><td><code>country-SG</code></td><td></td></tr><tr><td>斯洛伐克</td><td><code>country-SK</code></td><td></td></tr><tr><td>斯洛文尼亚</td><td><code>country-SI</code></td><td></td></tr><tr><td>韩国</td><td><code>country-KR</code></td><td></td></tr><tr><td>西班牙</td><td><code>country-ES</code></td><td></td></tr><tr><td>瑞典</td><td><code>country-SE</code></td><td></td></tr><tr><td>瑞士</td><td><code>country-CH</code></td><td></td></tr><tr><td>泰国</td><td><code>country-TH</code></td><td></td></tr><tr><td>英国</td><td><code>country-GB</code></td><td></td></tr><tr><td>美国</td><td><code>country-US</code></td><td></td></tr></tbody></table>

</details>

例如，如果你只想轮换美国代理池，请使用轮换端口 `8000` 并结合一个参数  `country-US` 在你的用户名中：

```bash
curl -x dc.oxylabs.io:8000 -U 'user-USERNAME-country-US:PASSWORD' https://ip.oxylabs.io/location
```

**代码示例**

{% tabs %}
{% tab title="cURL" %}

```sh
curl -x dc.oxylabs.io:8000 -U 'user-USERNAME-country-COUNTRY:PASSWORD' https://ip.oxylabs.io/location
```

{% endtab %}

{% tab title="Python" %}

<pre class="language-python"><code class="lang-python">#pip install requests
<strong>import requests
</strong>
username = 'USERNAME'
密码 = 'PASSWORD'
国家 = 'COUNTRY'
proxy = 'dc.oxylabs.io:8000'

代理 = {
   "https": ('https://user-%s-country-%s:%s@%s' % (username, country, password, proxy))
}

response=requests.get("https://ip.oxylabs.io/location", proxies=proxies)

print(response.content)
</code></pre>

{% endtab %}

{% tab title="Node.js" %}

```javascript
//npm install axios
const axios = require("axios");
const https = require("https");

const client = axios.create({
    httpsAgent: new https.Agent({
        rejectUnauthorized: false,
    }),
});
const username = 'USERNAME';
const country = 'COUNTRY'
const password = 'PASSWORD'

客户端
    .get("https://ip.oxylabs.io/location", {
        proxy: {
            protocol: "https",
            host: "dc.oxylabs.io",
            port: 8000,
            auth: {
                username: `user-${username}-country-${country}`,
                password: password,
            },
        },
    })
    .then((res) => {
        console.log(res.data);
    })
    .catch((err) => console.error(err));

```

{% endtab %}

{% tab title="PHP" %}

```php
<?php

$username = 'USERNAME';
$country = 'COUNTRY';
$password = 'PASSWORD';
$proxy = 'dc.oxylabs.io:8000';
$target = 'https://ip.oxylabs.io/location';

$request = curl_init($target);
curl_setopt($request, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($request, CURLOPT_PROXY, $proxy);
curl_setopt($request, CURLOPT_PROXYUSERPWD, "user-$username-country-$country:$password");
$responseBody = curl_exec($request);
$error = curl_error($request);
curl_close($request);

if ($responseBody !== false) {
    echo 'Response: ' . $responseBody;
} else {
    echo 'Failed to connect to proxy: ' . $error;
}

```

{% endtab %}

{% tab title="Go" %}

```go
package main

import (
	"fmt"
	"io"
	"net/http"
	"net/url"
)

func main() {
	username, country, password, entry := "USERNAME", "COUNTRY", "PASSWORD", "dc.oxylabs.io:8000"

	proxy, err := url.Parse(fmt.Sprintf("https://user-%s-country-%s:%s@%s", username, country, password, entry))
	if err != nil {
		panic(err)
	}

	transport := &http.Transport{
		Proxy: http.ProxyURL(proxy),
	}
	client := &http.Client{Transport: transport}
	target := "https://ip.oxylabs.io/location"
	response, err := client.Get(target)
	if err != nil {
		panic(err)
	}
	defer response.Body.Close()

	body, err := io.ReadAll(response.Body)
	if err != nil {
		panic(err)
	}
	fmt.Println("Response:")
	fmt.Println(string(body))
}

```

{% endtab %}

{% tab title="Java" %}

```java
package com.example;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Base64;

import org.apache.hc.client5.http.fluent.Request;
import org.apache.hc.core5.http.HttpHost;

public class App {
    public static void main(String[] args) throws IOException, URISyntaxException {
        String targetUrl = "http://ip.oxylabs.io/location";
        String username = "USERNAME";
        String country = "COUNTRY";
        String password = "PASSWORD";
        String proxy = "dc.oxylabs.io:8000";

        URI proxyURI = new URI(String.format("https://user-%s-country-%s:%s@%s", username, country, password, proxy));

        String basicAuth = new String(
                Base64.getEncoder()
                        .encode(
                                proxyURI.getUserInfo().getBytes()));
        String response = Request.get(targetUrl)
                .addHeader("Proxy-Authorization", "Basic " + basicAuth)
                .viaProxy(HttpHost.create(proxyURI))
                .execute().returnContent().asString();

        System.out.println(response);
    }
}

```

{% endtab %}

{% tab title="C#" %}

```csharp
using System.Net;

// .NET 目前不支持 HTTPS 代理
var proxy = new WebProxy {
    Address = new Uri("dc.oxylabs.io:8000"),
    Credentials = new NetworkCredential(
        userName: "user-USERNAME-country-COUNTRY",
        password: "PASSWORD"
    )
};

var httpClientHandler = new HttpClientHandler {Proxy = proxy};

using var client = new HttpClient(handler: httpClientHandler, disposeHandler: true);

var result = await client.GetStringAsync("https://ip.oxylabs.io/location");
Console.WriteLine(result);
```

{% endtab %}
{% endtabs %}

#### 订阅方式之间的差异

`按 IP 的数据中心` 提供轮换端口和 `国家` 参数的用户将获得一个 **来自其代理列表中所选国家的随机 IP** 随每个新请求而变化。\
\
`按流量的数据中心` 提供轮换端口和 `国家` 参数将获得 **来自整个代理池中所选国家的随机 IP。**

{% hint style="info" %}
我们使用 [**MaxMind GeoIP2**](https://www.maxmind.com/en/geoip2-databases) 数据库来确定 IP 的位置。&#x20;
{% endhint %}


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