HTTP Server in C

httpserver.c

#include <stdio.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <unistd.h>

#define MAXBUFFER 3000
#define PORT 4200

int main () {
  struct sockaddr_in servaddr = {};

  int sockfd = socket(AF_INET, SOCK_STREAM, 0);

  if (sockfd == -1) {
    printf("Socket creation failed...\n");
    exit(0);
  }

  if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &(int){1}, sizeof(int)) < 0) {
    printf("setsockopt(SO_REUSEADDR) failed\n");
    exit(0);
  }

  servaddr.sin_family = AF_INET;
  servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
  servaddr.sin_port = htons(PORT);

  if ((bind(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr))) != 0) {
    printf("Failed to bind socket\n");
    exit(0);
  }

  if (listen(sockfd, 5) != 0) {
    printf("Listen failed\n");
    exit(0);
  }

  printf("Server listening...\n");

  int addrlen = sizeof(servaddr);
  int connfd;

  for (;;) {
    connfd = accept(sockfd, (struct sockaddr *)&servaddr, (socklen_t*)&addrlen);

    if (connfd < 0) {
      printf("Accept failed: %d\n", connfd);
      exit(0);
    }

    char request[MAXBUFFER] = {0};
    read(connfd, request, sizeof(request));
    printf("Request: %s\n", request);

    char response[MAXBUFFER] = "HTTP/1.1 200\r\nContent-Type: text/html\r\n\r\n<h1>Hello!</h1>";
    write(connfd, response, sizeof(response));

    printf("Response: %s\n", response);

    close(connfd);
  }

  close(sockfd);
}