main.c

// $ gcc `pkg-config --cflags libcurl` -o main main.c `pkg-config --libs libcurl`&& ./main
#include <stdio.h>
#include <stdlib.h>

#include <curl/curl.h>

int main(void)
{
    if (curl_global_init(CURL_GLOBAL_DEFAULT) != 0) {
        fprintf(stderr, "ERROR: could not initialize global CURL state for some reason.\n");
        exit(1);
    }

    CURL *curl = curl_easy_init();
    if (curl == NULL) {
        fprintf(stderr, "ERROR: could not create easy CURL context\n");
        exit(1);
    }

    struct curl_slist *chunk = NULL;
    chunk = curl_slist_append(chunk, "Supa-Secret-Header: lol");

    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, chunk);
    curl_easy_setopt(curl, CURLOPT_TIMEOUT, 1);

    // $ while true; do printf "lol\r\nlol\r\n\r\n" | nc -l 8080; done
    {
        const char *const url = "http://localhost:8080/";
        curl_easy_setopt(curl, CURLOPT_URL, url);
        CURLcode res = curl_easy_perform(curl);
        if (res != CURLE_OK) {
            fprintf(stderr, "ERROR: CURL GET query of %s has failed: %s\n",
                    url,
                    curl_easy_strerror(res));
        }
        printf("------------------------------\n");
        sleep(1);
    }

    // $ while true; do printf "lol\r\nlol\r\n\r\n" | nc -l 8081; done
    {
        const char *const url = "http://localhost:8081/";
        curl_easy_setopt(curl, CURLOPT_URL, url);
        CURLcode res = curl_easy_perform(curl);
        if (res != CURLE_OK) {
            fprintf(stderr, "ERROR: CURL GET query of %s has failed: %s\n",
                    url,
                    curl_easy_strerror(res));
        }
        printf("------------------------------\n");
        sleep(1);
    }

    curl_easy_cleanup(curl);

    curl_global_cleanup();

    return 0;
}