A simple http client with C.

http_client.c

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

#define MAX_BUFFER_SIZE 1024

//Function prototypes:

// function to send http request
void send_http_request(int client_socket, const char *host, const char *path);
// function to receive http response
void receive_http_response(int client_socket);

// main function
int main(){
    const char *host = "example.com";
    const char *path = "/";

    // Create a TCP/IP socket
    int client_socket = socket(AF_INET, SOCK_STREAM, 0);

    // check if socket connected succesfully
    if (client_socket == -1) {
        perror("Error creating socket");
        exit(EXIT_FAILURE);
    }
    
    // Set up the server address
    struct sockaddr_in server_address;
    server_address.sin_family = AF_INET;
    server_address.sin_port = htons(80);
    inet_pton(AF_INET, host, &server_address.sin_addr);

    // Connect to the server
    if (connect(client_socket, (struct sockaddr*)&server_address, sizeof(server_address)) == -1) {
        perror("Error connecting to server");
        close(client_socket);
        exit(EXIT_FAILURE);
    }

    // Send the HTTP request
    send_http_request(client_socket, host, path);

    // Receive and print the HTTP response
    receive_http_response(client_socket);

    // Close the socket
    close(client_socket);

    return 0;
}

void send_http_request(int client_socket, const char *host, const char *path){
    // Create the HTTP request
    char request[MAX_BUFFER_SIZE];
    snprintf(request, sizeof(request), "GET %s HTTP/1.1\r\nHost: %s\r\n\r\n", path, host);
    
    // send the HTTP request to the server
    write(client_socket, request, strlen(request));
}

void receive_http_response(int client_socket){
    // Recieve and print the HTTP response from the server
    char response[MAX_BUFFER_SIZE];
    ssize_t bytes_received;
    
    // Read response streams
    while ((bytes_received = read(client_socket, response, sizeof(response) -  1)) > 0 ) {
        // Add string termination
        response[bytes_received] = '\0';
        printf("%s", response);
    }
}