3. Cos’è REST ?

4. REST non è un Protocollo un’ Architettura un Software uno Standard un nome carino per Web Services una Buzzword

5. Re presentational S tate T ransfer Roy T. Fielding “ Architectural Styles and Design of Network-based Software Architectures” Ph.D dissertation, 2000

6. REST è uno stile architetturale per applicazioni di rete , un insieme di vincoli e principi che, se seguiti, portano come risultato un’ architettura semplice e scalabile

8. REST : le risorse Le risorse sono fonti di informazioni accessibili attraverso un URI . Il client può attraverso un protocollo di comunicazione standard (ad es. http) ottenere una risorsa dal server. Le risorse sono disponibili in diverse rappresentazioni (ad es. XML, JSON, PNG)

9. HTTP è REST ful ma REST non è HTTP

10. HTTP GET /reviews/?filter=letter&letter=a HTTP/1.1 Host: www.goblins.net Connection: Close HTTP/1.1 200 OK Content-Type: application/xml; charset=UTF-8 <?xml version= &quot;1.0&quot; encoding=&quot;UTF-8&quot; ?> <root> <reviews> <review id= “1&quot; title=“Agricola&quot; > <descrizione>Agricola è un gioco…</descrizione> … </review> <review id= “2&quot; title=“Risiko&quot; > <descrizione>…</descrizione> … </review> </reviews> </root>

11. HTTP GET /reviews/?filter=letter&letter=a HTTP/1.1 Host: www.goblins.net Accept: application/php Connection: Close HTTP/1.1 200 OK Content-Type: application/php; charset=UTF-8 Connection: Close a:296:{i:0;a:33:{s:2:&quot;id&quot;;s:4:&quot;3791&quot;;s:4:&quot;date&quot;;s:10:&quot;2008-01-28&quot;;s:5:&quot;title&quot;;s:18:&quot;A Caccia con Papà&quot;;s:8:&quot;reviewer&quot;;s…

12. HTTP GET /reviews/?filter=letter&letter=a HTTP/1.1 Host: www.goblins.net Accept: application/json Connection: Close HTTP/1.1 200 OK Content-Type: application/json; charset=UTF-8 Connection: Close [{&quot;id&quot;:&quot;3791&quot;,&quot;date&quot;:&quot;2008-01-28&quot;,&quot;title&quot;:&quot;A Caccia con Pap00e0&quot;,&quot;reviewer&quot;: &quot;Lobo&quot;,&quot;email&quot;:&quot;sdp@sdp.net&quot;,&quot;s …

13. HTTP GET /reviews/?filter=letter&letter=a HTTP/1.1 Host: www.goblins.net Accept: text/yml Connection: Close HTTP/1.1 200 OK Content-Type: text/yml; charset=UTF-8 Connection: Close - id: '3791‘ date: '2008-01-28‘ title: 'A Caccia con Papà‘ reviewer: Lobo email: sdp@sdhjp.net score: '0‘ cover: '‘ url: '‘ url_title: '‘ hits: '500‘ …

14. HTTP GET /reviews/?filter=letter&letter=a HTTP/1.1 Host: www.goblins.net Accept: application/php Accept-Language: it Connection: Close HTTP/1.1 200 OK Content-Type: application/php; charset=UTF-8 Connection: Close a:296:{i:0;a:33:{s:2:&quot;id&quot;;s:4:&quot;3791&quot;;s:4:&quot;date&quot;;s:10:&quot;2008-01-28&quot;;s:5:&quot;title&quot;;s:18:&quot;A Caccia con Papà&quot;;s:8:&quot;reviewer&quot;;s…

15. HTTP GET /reviews/?filter=letter&letter=a HTTP/1.1 Host: www.goblins.net Accept: application/php Accept-Encoding: compress Connection: Close HTTP/1.1 200 OK Content-Type: application/php; charset=UTF-8 Content-Encoding: compress Vary: Accept-Encoding Connection: Close #@°&%&%%$&%@°...

16. HTTP GET /reviews/?filter=letter&letter=a HTTP/1.1 Host: www.goblins.net Accept: application/php; q=0.8, application/json, text/yml; q=0.5 Connection: Close HTTP/1.1 200 OK Content-Type: application/php; charset=UTF-8 Connection: Close a:296:{i:0;a:33:{s:2:&quot;id&quot;;s:4:&quot;3791&quot;;s:4:&quot;date&quot;;s:10:&quot;2008-01-28&quot;;s:5:&quot;title&quot;;s:18:&quot;A Caccia con Papà&quot;;s:8:&quot;reviewer&quot;;s…

20. MODEL

21. MODEL VIEW

22. VIEW

23. $data = array( 1 => array('ID'=>1, 'title'=>'Agricola', ...), 2 => array('ID'=>2, 'title'=>'Risiko', ...), ... ) //reviews.html <?xml version= &quot;1.0&quot; encoding=&quot;UTF-8&quot; ?> <root> <reviews> {% for i, r in reviews %} <review id= &quot;{{r.id}}&quot; title=&quot;{{r.title}}&quot; > {% for key, value in r %} <{{key}}>{{value}}</{{key}}> {% endfor %} </review> {% else %} <noresult>No result for this query</noresult> {% endfor %} </reviews> </root> <?xml version= &quot;1.0&quot; encoding=&quot;UTF-8&quot; ?> <root> <reviews> <review id= “1&quot; title=“Agricola&quot; > <descrizione>Agricola è un gioco…</descrizione> … </review> <review id= “2&quot; title=“Risiko&quot; > <descrizione>…</descrizione> … </review> </reviews> </root>

24. /reviews/?filter=letter&letter=a /reviews/5 /reviews/5/comments … .htaccess dispatch.php CONTROLLER web

25. /reviews/?filter=letter&letter=a /reviews/5 /reviews/5/comments … .htaccess dispatch.php CONTROLLER web

26. /reviews/?filter=letter&letter=a /reviews/5 /reviews/5/comments … .htaccess dispatch.php CONTROLLER //dispatch.php … $request = new Request( $config = array() ); $resource = $request->loadResource(); $response = $resource->exec($request); $response->output(); web

27. //ReviewResource.php <?php /** * The Review Collection * @uri /reviews(/(.)*)? */ class ReviewsResource extends Resource { /** * Handle a GET request for this resource * @param Request request * @return Response */ function get($request) { $response = new Response($request); $etag = md5($request->uri); if ($request->ifNoneMatch($etag)) { $response->code = Response::NOTMODIFIED ; } else { $response->code = Response::OK ; $response->addHeader('Content-type', 'text/html; charset=&quot;UTF-8&quot;'); $headers = $this-> selectHeaders ($request); foreach($headers as $key => $value) $response->addHeader($key, $value); $response->addEtag($etag); $response->body = $this-> selectBody ($request); } return $response; } … }

28. On code

29. /reviews/5

30. web