Server C

15.02.2021

Сам сервер можно написать на многих языках примеры тут
ещё пример

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys types.h=""> 
#include <sys socket.h="">
#include <netinet in.h="">
#include <netdb.h>
#include <arpa inet.h="">
#include <err.h>
 
char response[] = "HTTP/1.1 200 OK\r\n"
"Content-Type: text/html; charset=UTF-8\r\n\r\n"
"<title>Bye-bye baby bye-bye</title>"
"<style>body { background-color: #111 }"
"h1 { font-size:4cm; text-align: center; color: black;"
" text-shadow: 0 0 2mm red}</style>"
"<h1>Goodbye, world!</h1>\r\n";
 
int main()
{
  int one = 1, client_fd;
  struct sockaddr_in svr_addr, cli_addr;
  socklen_t sin_len = sizeof(cli_addr);
 
  int sock = socket(AF_INET, SOCK_STREAM, 0);
  if (sock < 0)
    err(1, "can't open socket");
 
  setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(int));
 
  int port = 8080;
  svr_addr.sin_family = AF_INET;
  svr_addr.sin_addr.s_addr = INADDR_ANY;
  svr_addr.sin_port = htons(port);
 
  if (bind(sock, (struct sockaddr *) &svr_addr, sizeof(svr_addr)) == -1) {
    close(sock);
    err(1, "Can't bind");
  }
 
  listen(sock, 5);
  while (1) {
    client_fd = accept(sock, (struct sockaddr *) &cli_addr, &sin_len);
    printf("got connection\n");
 
    if (client_fd == -1) {
      perror("Can't accept");
      continue;
    }
 
    write(client_fd, response, sizeof(response) - 1); /*-1:'\0'*/
    close(client_fd);
  }
}

Как вариант на рабочем веб сервере написать кусочек ищем
c cgi example
nginx fastcgi c

gcc hello.c -o hello.cgi

cgi-fcgi -start -connect 127.0.0.1:9000 ./hello_world