Requete en c / socket

$ cat 35192101.c 

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

#define MEM_BLOCK_SIZE 4096

int main(void)
{
	int sockfd, portno, n;
	struct sockaddr_in serv_addr;
	struct hostent *server;

	char buffer[MEM_BLOCK_SIZE];
	char *host = "essais.lionzone.fr";
	char *p = NULL;

	portno = 80;
	sockfd = socket(AF_INET, SOCK_STREAM, 0);
	if (sockfd < 0) 
		perror("ERROR opening socket");
	server = gethostbyname(host);
	if (server == NULL) {
		fprintf(stderr,"ERROR, no such host\n");
		exit(0);
	}
	memset((char *) &serv_addr, 0, sizeof(serv_addr));
	serv_addr.sin_family = AF_INET;
	memcpy((char *)&serv_addr.sin_addr.s_addr,
			(char *)server->h_addr, 
			server->h_length);
	serv_addr.sin_port = htons(portno);
	if (connect(sockfd,(struct sockaddr *) &serv_addr,
				sizeof(serv_addr)) < 0) 
		perror("ERROR connecting");
	const char * request = "GET / HTTP/1.0\r\nHost: essais.lionzone.fr\r\nConnection: close\r\n\r\n";
	n = write(sockfd,request,strlen(request));
	if (n < 0) perror("ERROR writing to socket");

	/* the data to be found plus the http header
	 * shall be less than MEM_BLOCK_SIZE - 1
	 */
	memset(buffer, 0, MEM_BLOCK_SIZE);
	n = recv(sockfd,buffer, MEM_BLOCK_SIZE - 1, 0);
	if (n < 0) {
		perror("ERROR reading from socket");
		return 0;
	}
	if (n == 0) {
		perror("ERROR no data");
		return 0;
	}
	printf("number of bytes received: %d\n", n);
	printf("full response received:\n%s\n",buffer);

	p = strstr(buffer, "\r\n\r\n");
	if (p) {
		p = p + 4;	/* move after the 4 chars */
		printf("what is after the http header is:"
				" \n------\n%s\n------\n", p);
	}
	else {
		perror("ERROR empty line ending headers not found");
	}

	close(sockfd);
	return 0;
}

$ gcc -Wall 35192101.c
$ ./a.out 
number of bytes received: 200
full response received:
HTTP/1.1 200 OK
Server: o2switch PowerBoost
Date: Fri, 09 Feb 2018 17:14:37 GMT
Content-Type: text/html; charset=UTF-8
Connection: close
Vary: Accept-Encoding
X-Powered-By: PHP/5.6.33

tatane

what is after the http header is: 
------
tatane

------
$