<h1>Hello!</h1>

#include <stdio.h>#include <stdlib.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include <unistd.h>#include <string.h>#define PORT 8888#define BUFFER_SIZE 4096#define RESPONSE_HEADER "HTTP/1.1 200 OK/r/nConnection: close/r/nAccept-Ranges: bytes/r/nContent-Type: text/html/r/n/r/n"#define RESPONSE_BODY "<h1>Hello!</h1>"int handle(int conn){  int len = 0;  char buffer[BUFFER_SIZE];  char *pos = buffer;  bzero(buffer, BUFFER_SIZE);  len = recv(conn, buffer, BUFFER_SIZE, 0);  if (len <= 0 ) {    printf ("recv error");    return -1;  } else {    printf("Debug request:/n--------------/n%s/n/n",buffer);  }  send(conn, RESPONSE_HEADER RESPONSE_BODY, sizeof(RESPONSE_HEADER RESPONSE_BODY), 0);  close(conn);//關閉連接}int main(int argc,char *argv[]){  int port = PORT;  struct sockaddr_in client_sockaddr;     struct sockaddr_in server_sockaddr;  int listenfd = socket(AF_INET,SOCK_STREAM,0);  int opt = 1;   int conn;  socklen_t length = sizeof(struct sockaddr_in);  setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(int));  server_sockaddr.sin_family = AF_INET;  server_sockaddr.sin_port = htons(port);  server_sockaddr.sin_addr.s_addr = htonl(INADDR_ANY);  if(bind(listenfd,(struct sockaddr *)&server_sockaddr,sizeof(server_sockaddr))==-1){    printf("bind error!/n");    return -1;    }   if(listen(listenfd, 10) < 0) {    printf("listen failed!/n");    return -1;    }  while(1){    conn = accept(listenfd, (struct sockaddr*)&client_sockaddr, &length);    if(conn < 0){      printf("connect error!/n");      continue;    }    if (handle(conn) < 0) {      printf("connect error!/n");      close(conn);      continue;    }   }  return 0;}