linux c post

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>

#define SERVER "example.com"
#define PORT 80

void send_post_request(const char *url, const char *data) {
    int sock;
    struct sockaddr_in server_addr;
    char request[1024];
    char response[4096];

    // Create socket
    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        perror("Socket creation error");
        return;
    }

    // Configure server address
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(PORT);

    // Convert IPv4 addresses from text to binary form
    if (inet_pton(AF_INET, SERVER, &server_addr.sin_addr) <= 0) {
        perror("Invalid address/ Address not supported");
        return;
    }

    // Connect to server
    if (connect(sock, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
        perror("Connection Failed");
        return;
    }

    // Prepare HTTP POST request
    snprintf(request, sizeof(request),
             "POST /%s HTTP/1.1\r\n"
             "Host: %s\r\n"
             "Content-Type: application/x-www-form-urlencoded\r\n"
             "Content-Length: %zu\r\n"
             "Connection: close\r\n\r\n%s",
             url, SERVER, strlen(data), data);

    // Send request
    send(sock, request, strlen(request), 0);
    printf("Request sent\r\n");

    // Receive response
    int bytes_received;
    while ((bytes_received = recv(sock, response, sizeof(response) - 1, 0)) > 0) {
        response[bytes_received] = '\0';
        printf("%s", response);
    }

    // Close socket
    close(sock);
}

int main() {
    const char *url = "submit";
    const char *data = "key1=value1&key2=value2";
    send_post_request(url, data);
    return 0;
}