toys/simple-http-server-c/test-data/main.c

// Build: clang -o main main.c -lcurl
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>

static size_t write_callback(void *data, size_t size, size_t nmemb, void *userdata)
{
    size_t realsize = size * nmemb;
    char *ptr = malloc(realsize + 1);
    if (ptr)
    {
        memcpy(ptr, data, realsize);
        ptr[realsize] = '\0';
        *(char **)userdata = ptr;
    }
    return realsize;
}

int main(void)
{
    CURL *curl;
    CURLcode res;
    const char *url = "http://localhost:3000/todos";
    const char *data = "{\"text\": \"first todo\"}";
    struct curl_slist *headers = NULL;
    char error[CURL_ERROR_SIZE] = { 0 };
    long response_code;
    char *response_data;

    curl_global_init(CURL_GLOBAL_ALL);

    curl = curl_easy_init();
    if (curl)
    {
        headers = curl_slist_append(headers, "Content-Type: application/json");
        curl_easy_setopt(curl, CURLOPT_URL, url);
        curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data);
        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
        curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, error);
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_callback);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response_data);
        res = curl_easy_perform(curl);
        if (res != CURLE_OK) {
            printf("curl_easy_perform() failed: %s\n", curl_easy_strerror(res));
            printf("%s\n", error);
        } else {
            curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &response_code);
            printf("Response code: %ld\n", response_code);
            printf("Response data: %s\n", response_data);
            free(response_data);
        }

        curl_easy_cleanup(curl);
    }

    curl_slist_free_all(headers);

    curl_global_cleanup();

    return 0;
}