curl easy perform with proxy

// test_curl.c
#include <stdio.h>
#include <stdlib.h>
#include <curl/curl.h>
#include <curl/easy.h>

int url_Perform(CURL* url, char* url_str) {
        curl_easy_setopt(url, CURLOPT_URL, url_str);
        CURLcode code = code = curl_easy_perform(url);
        if(code != CURLE_OK) {
                printf("%s\n", curl_easy_strerror(code));
                return EXIT_FAILURE;
        }
        return EXIT_SUCCESS;
}

int main(int argc, char* argv[]) {
        CURL* url = curl_easy_init();
        char* proxy = getenv("http_proxy");
        curl_easy_setopt(url, CURLOPT_PROXY, proxy);
        int code = url_Perform(url, argv[1]);
        curl_easy_cleanup(url);
        return code;
}
/*
$ gcc -lcurl -o test_curl  test_curl.c;http_proxy=http://proxy:3128 ./test_curl http://www.google.com
*/