Metodologias de Programação IV - Aula 4, Secção 1 - Suporte para cache no protocolo HTTP

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Leonel Morgado

Suporte para cache no protocolo HTTP

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GET /tc/home.html HTTP/1.1 Host: www.tribunalconstitucional.pt ... HTTP/1.1 200 OK Content-Type: text/html … … …

GET /tc/home.html HTTP/1.1 Host: www.tribunalconstitucional.pt ... HTTP/1.1 200 OK Content-Type: text/html … … … + 40.318 bytes

GET /tc/home.html HTTP/1.1 Host: www.tribunalconstitucional.pt ... HTTP/1.1 200 OK Content-Type: text/html Date: Sun, 16 Oct 2011 16:20:34 GMT Last-Modified: Sun, 16 Oct 2011 07:49:25 GMT … + 40.318 bytes

Last-Modified: Wed, 29 Sep 2010 16:33:13 GMT Last-Modified: Thu, 02 Jul 2009 02:19:00 GMT Last-Modified: Sat, 06 Feb 2010 19:47:46 GMT Last-Modified: Wed, 17 Sep 2003 14:46:36 GMT //v1.7 // Flash Player Version Detection // Detect Client Browser type Last-Modified: Thu, 29 Jan 2009 02:09:59 GMT Last-Modified: Sun, 16 Oct 2011 07:49:26 GMT

HEAD /tc/home.html HTTP/1.1 Host: www.tribunalconstitucional.pt ... HTTP/1.1 200 OK Content-Type: text/html Date: Sun, 16 Oct 2011 16:20:34 GMT Last-Modified: Sun, 16 Oct 2011 07:49:25 GMT … + 0 bytes

HEAD /tc/home.html HTTP/1.1 Host: www.tribunalconstitucional.pt ... HTTP/1.1 200 OK Connection: Keep-Alive Client-response-num: 1 Keep-Alive: timeout=15, max=100 Set-Cookie: AF_SID=b672a03f4a0338f035131f6b8034ff33; path=/ Date: Sun, 16 Oct 2011 16:20:34 GMT Last-Modified: Sun, 16 Oct 2011 07:49:25 GMT Client-peer: 65.98.99.99.166:80 Client-date: Sun, 16 Oct 2011 16:20:34 GMT Content-Type: text/html Server: Apache/1.3.41 (Unix) mod_perl/1.31 mod_ssl/2.8.31 OpenSSL/0.9.8e 420 bytes

Cliente Servidor HEAD ... HTTP/1.1 200 OK

Cliente Servidor HEAD ... HTTP/1.1 200 OK GET ... HTTP/1.1 200 OK

GET /tc/home.html HTTP/1.1 Host: www.tribunalconstitucional.pt If-Modified-Since: Fri, 14 Oct 2011 19:08:24 GMT ... HTTP/1.1 200 OK Date: Sun, 16 Oct 2011 16:20:34 GMT Last-Modified: Sun, 16 Oct 2011 07:49:25 GMT Server: Apache/1.3.41 (Unix) mod_perl/1.31 mod_ssl/2.8.31 OpenSSL/0.9.8e Set-Cookie: AF_SID=7896d3ac9d40552973a20a4e6cd7ceac; path=/ Keep-Alive: timeout=15, max=100 Connection: Keep-Alive Transfer-Encoding: chunked Content-Type: text/html + 40.318 bytes

GET /tc/home.html HTTP/1.1 Host: www.tribunalconstitucional.pt If-Modified-Since: Sun, 16 Oct 2011 07:49:25 GMT ... 299 bytes HTTP/1.1 304 Notmodified Connection: Keep-Alive Keep-Alive: timeout=15, max=99 Date: Sun, 16 Oct 2011 18:26:07 GMT Client-peer: 65.98.99.166:80 Etag: "e05af-19db-4a4beb1b“ Client-date: Sun, 16 Oct 2011 18:26:06 GMT Server: Apache/1.3.41 (Unix) mod_perl/1.31 mod_ssl/2.8.31 OpenSSL/0.9.8e

Cliente Servidor GET ... HTTP/1.1 200 OK HTTP/1.1 304 Notmodified

“HTTP/1.1 implements a more efficientapproach to thisproblemusingtwonewheaders: If-Modified-Sinceand(...)” (p. 58) HEAD If-Modified-Since

HEAD If-Modified-Since http://bit.ly/oNhktc

HEAD If-Modified-Since Ideal para cache Alternativa p/ cache Recolha de listas de recursos

Leituras associadas Web ApplicationArchitecture, Second Edition Cap. 3: “Birth of the Web: HTTP”, pp. 49-51 e 58-59. Krishnamurthy, B.; Mogul, J.; Kristol, D. (1999). Key Differences between HTTP/1.0 and HTTP/1.1. In “WWW8 Conference Refereed Papers”, Eighth International World Wide Web Conference, Toronto Convention Centre, Toronto, Canadá, 11 a 14 de Maio, 1999. http://bit.ly/oNhktc

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Metodologias de Programação IV - Aula 4, Secção 1 - Suporte para cache no protocolo HTTP

1. Suporte para cache no protocolo HTTP 2011-2012 Metodologias de Programação IV

2. GET /tc/home.html HTTP/1.1 Host: www.tribunalconstitucional.pt ... HTTP/1.1 200 OK Content-Type: text/html … … …

3. GET /tc/home.html HTTP/1.1 Host: www.tribunalconstitucional.pt ... HTTP/1.1 200 OK Content-Type: text/html … … … + 40.318 bytes

4. GET /tc/home.html HTTP/1.1 Host: www.tribunalconstitucional.pt ... HTTP/1.1 200 OK Content-Type: text/html Date: Sun, 16 Oct 2011 16:20:34 GMT Last-Modified: Sun, 16 Oct 2011 07:49:25 GMT … + 40.318 bytes

5. GET /tc/home.html HTTP/1.1 Host: www.tribunalconstitucional.pt ... HTTP/1.1 200 OK Content-Type: text/html Date: Sun, 16 Oct 2011 16:20:34 GMT Last-Modified: Sun, 16 Oct 2011 07:49:25 GMT … + 40.318 bytes

6. Last-Modified: Wed, 29 Sep 2010 16:33:13 GMT Last-Modified: Thu, 02 Jul 2009 02:19:00 GMT Last-Modified: Sat, 06 Feb 2010 19:47:46 GMT Last-Modified: Wed, 17 Sep 2003 14:46:36 GMT //v1.7 // Flash Player Version Detection // Detect Client Browser type Last-Modified: Thu, 29 Jan 2009 02:09:59 GMT Last-Modified: Sun, 16 Oct 2011 07:49:26 GMT

7. Cliente Servidor

8. Cliente Servidor Proxies ...

9. HEAD /tc/home.html HTTP/1.1 Host: www.tribunalconstitucional.pt ... HTTP/1.1 200 OK Content-Type: text/html Date: Sun, 16 Oct 2011 16:20:34 GMT Last-Modified: Sun, 16 Oct 2011 07:49:25 GMT … + 0 bytes

10. HEAD /tc/home.html HTTP/1.1 Host: www.tribunalconstitucional.pt ... HTTP/1.1 200 OK Connection: Keep-Alive Client-response-num: 1 Keep-Alive: timeout=15, max=100 Set-Cookie: AF_SID=b672a03f4a0338f035131f6b8034ff33; path=/ Date: Sun, 16 Oct 2011 16:20:34 GMT Last-Modified: Sun, 16 Oct 2011 07:49:25 GMT Client-peer: 65.98.99.99.166:80 Client-date: Sun, 16 Oct 2011 16:20:34 GMT Content-Type: text/html Server: Apache/1.3.41 (Unix) mod_perl/1.31 mod_ssl/2.8.31 OpenSSL/0.9.8e 420 bytes

11. HEAD /tc/home.html HTTP/1.1 Host: www.tribunalconstitucional.pt ... HTTP/1.1 200 OK Connection: Keep-Alive Client-response-num: 1 Keep-Alive: timeout=15, max=100 Set-Cookie: AF_SID=b672a03f4a0338f035131f6b8034ff33; path=/ Date: Sun, 16 Oct 2011 16:20:34 GMT Last-Modified: Sun, 16 Oct 2011 07:49:25 GMT Client-peer: 65.98.99.99.166:80 Client-date: Sun, 16 Oct 2011 16:20:34 GMT Content-Type: text/html Server: Apache/1.3.41 (Unix) mod_perl/1.31 mod_ssl/2.8.31 OpenSSL/0.9.8e 420 bytes Mas se setiveralteradoemrelação à cópiaem cache… GET /tc/home.html...

12. Cliente Servidor HEAD ... HTTP/1.1 200 OK

13. Cliente Servidor HEAD ... HTTP/1.1 200 OK GET ... HTTP/1.1 200 OK

14. GET /tc/home.html HTTP/1.1 Host: www.tribunalconstitucional.pt If-Modified-Since: Fri, 14 Oct 2011 19:08:24 GMT ... HTTP/1.1 200 OK Date: Sun, 16 Oct 2011 16:20:34 GMT Last-Modified: Sun, 16 Oct 2011 07:49:25 GMT Server: Apache/1.3.41 (Unix) mod_perl/1.31 mod_ssl/2.8.31 OpenSSL/0.9.8e Set-Cookie: AF_SID=7896d3ac9d40552973a20a4e6cd7ceac; path=/ Keep-Alive: timeout=15, max=100 Connection: Keep-Alive Transfer-Encoding: chunked Content-Type: text/html + 40.318 bytes

15. GET /tc/home.html HTTP/1.1 Host: www.tribunalconstitucional.pt If-Modified-Since: Fri, 14 Oct 2011 19:08:24 GMT ... HTTP/1.1 200 OK Date: Sun, 16 Oct 2011 16:20:34 GMT Last-Modified: Sun, 16 Oct 2011 07:49:25 GMT Server: Apache/1.3.41 (Unix) mod_perl/1.31 mod_ssl/2.8.31 OpenSSL/0.9.8e Set-Cookie: AF_SID=7896d3ac9d40552973a20a4e6cd7ceac; path=/ Keep-Alive: timeout=15, max=100 Connection: Keep-Alive Transfer-Encoding: chunked Content-Type: text/html + 40.318 bytes

16. GET /tc/home.html HTTP/1.1 Host: www.tribunalconstitucional.pt If-Modified-Since: Sun, 16 Oct 2011 07:49:25 GMT ... 299 bytes HTTP/1.1 304 Notmodified Connection: Keep-Alive Keep-Alive: timeout=15, max=99 Date: Sun, 16 Oct 2011 18:26:07 GMT Client-peer: 65.98.99.166:80 Etag: "e05af-19db-4a4beb1b“ Client-date: Sun, 16 Oct 2011 18:26:06 GMT Server: Apache/1.3.41 (Unix) mod_perl/1.31 mod_ssl/2.8.31 OpenSSL/0.9.8e

17. Cliente Servidor GET ... HTTP/1.1 200 OK HTTP/1.1 304 Notmodified

18. HEAD If-Modified-Since

19. “HTTP/1.1 implements a more efficientapproach to thisproblemusingtwonewheaders: If-Modified-Sinceand(...)” (p. 58) HEAD If-Modified-Since

20. “HTTP/1.1 implements a more efficientapproach to thisproblemusingtwonewheaders: If-Modified-Sinceand(...)” (p. 58) HEAD If-Modified-Since

21.

22. HEAD If-Modified-Since http://bit.ly/oNhktc

23. HEAD If-Modified-Since Ideal para cache Alternativa p/ cache Recolha de listas de recursos

24. HEAD If-Modified-Since Ideal para cache Alternativa p/ cache Recolha de listas de recursos

25. Leituras associadas Web ApplicationArchitecture, Second Edition Cap. 3: “Birth of the Web: HTTP”, pp. 49-51 e 58-59. Krishnamurthy, B.; Mogul, J.; Kristol, D. (1999). Key Differences between HTTP/1.0 and HTTP/1.1. In “WWW8 Conference Refereed Papers”, Eighth International World Wide Web Conference, Toronto Convention Centre, Toronto, Canadá, 11 a 14 de Maio, 1999. http://bit.ly/oNhktc

Metodologias de Programação IV - Aula 4, Secção 1 - Suporte para cache no protocolo HTTP

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