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File non trovato

HTTP/1.1 404 Not Found Date: Tue, 06 Jan 2006 13:40:52 GMT Server: HP Apache-based Web Server/1.3.27 (Unix) mod_perl/1.27 PHP/4.2.2 Transfer-Encoding: chunked Content-Type: text/html a5 <html> <head> <title>404 Not Found</title> <link rel="stylesheet" href="./fonts.css" type="text/css">

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File non trovato

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  1. HTTP/1.1 404 Not Found • Date: Tue, 06 Jan 2006 13:40:52 GMT • Server: HP Apache-based Web Server/1.3.27 (Unix) mod_perl/1.27 PHP/4.2.2 • Transfer-Encoding: chunked • Content-Type: text/html • a5 • <html> • <head> • <title>404 Not Found</title> • <link rel="stylesheet" href="./fonts.css" type="text/css"> • </head> • <body bgcolor="#FFFFFF" text="#000000"> • <h1>Page Not Found</h1> • <p class="text">The requested URL • /~avf/foo.html • was not found on this server.</P> • </body> • </html> • 0 • Connection closed by foreign host. File non trovato • bash-2.05b$ telnet www.myserver.unimi.it 80 • Trying 10.0.64.233... • Connected to www.myserver.unimi.it . • Escape character is '^]'. • GET/~avf/foo.htmlHTTP/1.1 • Host: www.myserver.unimi.it Se il file non viene trovato, la risposta include il codice d’errore 404 e la pagina d’errore generica

  2. Richieste non standard • Il protocollo HTTP comprende un gran numero di tipi di richieste e di possibili risposte. • Non tutte le richieste causano un trasferimento di dati. • In alcuni casi si tratta di informazioni sul server. • Esaminiamo alcuni esempi.

  3. HTTP/1.1 200 OK Date: Tue, 06 Jan 2006 11:45:09 GMT Server: HP Apache-based Web Server/1.3.27 (Unix) mod_perl/1.27 PHP/4.2.2 Last-Modified: Tue, 30 Dec 2005 12:37:03 GMT ETag: "10b3e-1000-431452ef" Accept-Ranges: bytes Content-Length: 4096 Content-Type: text/html <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.or g/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> … </head> <body> <h1>Homepage</h1> … </body> </html> Connection closed by foreign host. URI relative a directory • bash-2.05b$ telnet www.myserver.unimi.it 80 • Trying 10.0.64.233... • Connected to www.myserver.unimi.it. • Escape character is '^]'. • GET/~avf/index.html HTTP/1.1 • Host: www.myserver.unimi.it Se è specificata una directory, il server vi cercherà un file denominato index.html

  4. HTTP/1.1 301Moved Permanently Date: Tue, 06 Jan 2006 13:49:15 GMT Server: HP Apache-based Web Server/1.3.27 (Unix) mod_perl/1.27 PHP/4.2.2 Location: http:// www.myserver.unimi.it /~avf/ Transfer-Encoding: chunked Content-Type: text/html; charset=iso-8859-1 148 <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <HTML><HEAD> <TITLE>301 Moved Permanently</TITLE> </HEAD><BODY> <H1>Moved Permanently</H1> The document has moved <A HREF="http://www.myserver.unimi.it/~avf/">here</A>.<P> <HR> <ADDRESS>HP Apache-based Web Server/1.3.27 Server at www.myserver.unimi.it Port 80</ADDRESS> </BODY></HTML> 0 Connection closed by foreign host. Reindirizzamento • bash-2.05b$ telnet www.myserver.unimi.it 80 • Trying 10.0.64.233... • Connected to www.myserver.unimi.it. • Escape character is '^]'. • GET/~avfHTTP/1.1 • Host:www.myserver.unimi.it Poiché all’URI manca / alla fine, il browser deve fare 2 richieste

  5. FINE Campi dell’header di richiesta • Il client può specificare ulteriori informazioni nella richiesta. • User-Agent Indica la versione del browser. • Referer Comunica al server da dove proviene l’utente (utile per eseguire il log e per tenere traccia dell’utente). • From Contiene l’indirizzo e-mail dell’utente (generalmente non usato per motivi di privacy). • Authorization Può inviare il nome utente e la password (usato con documenti che richiedono l’autorizzazione). • If-Modified-Since Invia il documento solo se è più recente della data specificata (usato per memorizzare nella cache).

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