Re: Optimisations:

On peut même se passer du content-length en HTTP/1.0, vu que pas de keep-alived. (Sans keep-alived, la fin du document c'est quand la connexion est fermée).

Sinon en PHP, 0 fork:

#!/usr/bin/php5
HTTP/1.0 403 Forbidden
Date: <?php echo date(DATE_RFC822)."\r\n"; ?>
Server: Apache
Content-Type: text/html

<?php readfile('/var/www/blacklisted/index.html'); ?>

Ou en C:

#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>

#define STATUS "HTTP/1.0 403 Forbidden"
#define SERVER "Apache"
#define CONTENT_TYPE "text/html"

#define PAGE_FILE "/var/www/blacklisted/index.html"

int main(int argc, char *argv[])
{
char date[50];
time_t t;
struct tm *tmp;
FILE *fp;
char line[1024];

t = time(NULL);
tmp = localtime(&t);
strftime(date, sizeof(date), "%a, %d %b %Y %H:%M:%S %z", tmp);

printf("%s\r\n", STATUS);
printf("Date: %s\r\n", date);
printf("Server: %s\r\n", SERVER);
printf("Content-Type: %s\r\n", CONTENT_TYPE);
printf("\r\n");

if ((fp = fopen(PAGE_FILE, "r")) == NULL) {
perror("Could not read file");
return 1;
}

while (fgets(line, 1024, fp) != NULL) {
printf("%s", line);
}

fclose(fp);

return 0;
}