C语言代码示例-开发者指南-青果网络

```c++
#include <iostream>
#include <algorithm>
#include <cstring>
#include "curl/curl.h"
using namespace std;

static size_t WriteMemoryCallback(void* ptr, size_t size, size_t nmemb, void* stream) {
	size_t nsize = size * nmemb;
	string* strdata = (string*)stream;
	if (strdata)
		strdata->append((const char*)ptr, nsize);
	return nsize;
}

void Proxy(string& resp) {
	CURL* curl = curl_easy_init();
	CURLcode res;
	if (curl) {
		curl_easy_setopt(curl, CURLOPT_URL, "https://test.ipw.cn");
		// 如果上面目标站不可用，请使用ip.sb、ipinfo.io、ip-api.com、64.ipcheck.ing
		curl_easy_setopt(curl, CURLOPT_PROXY, "http://代理IP:端口号"); 
		curl_easy_setopt(curl, CURLOPT_PROXYUSERPWD, "请改成您的Key:请改成您的AuthPwd");
		curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
		curl_easy_setopt(curl, CURLOPT_WRITEDATA, &resp);
		res = curl_easy_perform(curl);
		curl_easy_cleanup(curl);
		if (res != CURLE_OK) {
			fprintf(stderr, "request failed: %s\n", curl_easy_strerror(res));
		}
	}
}

int main() {
	string response;
	Proxy(response);
	cout << response << endl;
	return 0;
}
```