Web - Arhitectura Web
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
Tehnologii Web
Dr. SabinCorneliu BuragaFacultatea de Informatica
Universitatea “A.I.Cuza” – Iasi, Romania
http://www.infoiasi.ro/~busaco/
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
SpatiulSpatiul WWorld orld WWideide WWebeb
ArhitecturaArhitectura
DetaliiDetalii in in [PSW, 13[PSW, 13‐‐43] [TX, 1143] [TX, 11‐‐28]28]
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
“De la un anumit punct incolo, nu mai exista cale de intoarcere. Acela este punctul ce trebuie atins.”
Franz Kafka
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
intrebare
Ce reprezinta Web‐ul?
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
cuprins
Spatiul World‐Wide Web: “definitii”, istorie, constituenti
HipertextulAdresarea resurselor Web: identificatori uniformi de resurse (URI)
Protocolul HTTP (HyperText Transfer Protocol)Privire de ansamblu
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
world wide web
Web, WWW, “pinza de paianjen mondiala”
Sistem de distributie locala sau globala a informatiilor hipermedia
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
world wide web
Serviciu InternetWWW ≠ Internet
Bazat pemodelul client/server si pe hipertext
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
world wide web
CERN – 1989, Sir Tim Berners‐Lee et al.
“Information Management: A Proposal”
http://www.w3.org/History/1989/proposal.html
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
world wide web
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
world wide web
Functioneaza conform reglementarilorConsortiului Web
MIT, ERCIM, Keio UniversityAdobe, HP, IBM, Microsoft, Sun,…
www.w3.org
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
world wide web
Ideea:integrarea unor sisteme informationale disparate
intr‐un mod unitar,fara diferente intre sursele de date
“Anything can link to anything”
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
world wide web
Scopuri principale – Tim Berners‐Lee:independenta de dispozitivindependenta de software
scalabilitateamultimedia
caracter deschis open standards
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
world wide web
Resursele sint identificate prin adresa lor– identificator uniform de resurse (URI)
Existenta unui protocol (e.g., HTTP) pentru accesul la continutul resurselor
Resursele (vazute ca documente) includ marcaje (adnotari)
Marcajele contin la rindul lor URI‐uripaginipaginiWebWeb
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
Relatiile dintre o resursa Web, adresa ei (URI) sireprezentarea structurata a resursei
Reprezentarea = date propriu‐zise + meta‐date (date despre date)
world wide web
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
intrebare
Ce inseamna hipertextul?
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
“Material scris sau grafic interconectatintr‐o maniera complexa care in modconventional nu poate fi reprezentat pe hirtie.” – Ted Nelson, 1965
hipertext: definire
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
Text non‐liniarForma de document electronicMetoda de organizare complexa a informatiilor
Forma de comunicare dintre om si calculator,interfata fiind hipertextul
hipertext: definire
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
Vannebar Bush – As We May Think (1945)MEMEX (MEMory EXtended)
hipertext: istoric
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
Douglas EngelbartAugment (1968)
mouse, interfete grafice, procesoare de text,posta electronica, script‐uri, ferestre pe ecran etc.
hipertext: istoric
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
Ted NelsonXanadu (prototip 1991) termenul “hipertext”
hipermedia = hipertext (+multimedia)multimedia = Σmedii
medii: continue (audio, video) | discrete (text)
hipertext: istoric
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
hipertext: ingrediente
Noduri = concepteLegaturi = relatii
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
hipertext: ingrediente
Noduri interconectate prin legaturi
Nod sursa = referinta (ancora)Nod destinatie = referent (ancora)
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
Bi‐ sau uni‐directionaleReferentiale (non‐ierarhice) & organizationale(ierarhice, structurale)
Statice sau dinamice
hipertext: legaturi
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
hipertext
Documente hipertextPartea de continut – tipuri de mediiPartea de organizare (noduri & legaturide structura – secventa sau explorare)
Partea de prezentare(textuala, grafica, multimedia, 3D, mixta)
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
hipertext
Structuri hipermediaDocumente hipertext/hipermedia interconectate
Fenomenul “lost in space”
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
hipertext
Modul de explorare a hipertextului: metafora cartii tiparitestructura liniara cu salturistructura ierarhicastructura semanticacombinata
Structura liniara cu salturi
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
intrebare
Cum identificam (adresam) resursele Web?
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
URI
Accesul la o resursa Web se realizeazaprin intermediul identificatorilor uniformi de resurse – URI (Uniform Resource Identifiers)
RFC 2396, 3986
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
URI: definitii
Resursa“lucru” care poseda o identitate
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
URI: definitii
Identificatorobiect care poate juca rolul unei resurse
(secventa de caractere avind o sintaxa precisa)
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
URI: definitii
Uniformitatese permite o interpretare semantica uniformaa mai multor conventii sintactice comune
desemnind identificatori ai unor resurse eterogene
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
Uniform Resource Locatoridentifica resursele prin reprezentarea
mecanismului de accesare(adresa de retea, domeniu simbolic)
RFC 2717, 2718
URI = URL + URN
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
Uniform Resource Locator
http://www.infoiasi.ro/~busaco/teach/mailto:[email protected]
ftp://ftp.funet.fi/pub/README.txttel:+40232201090
URI = URL + URN
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
Uniform Resource Nameidentifica resursele prin nume,
intr‐o forma persistenta, chiar daca resursa este inaccesibila sau a disparut
RFC 2141
URI = URL + URN
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
URI = URL + URN
urn:infoiasi.ro:BookInfourn:mozilla:package:communicator
urn:ISBN:973‐681‐988‐4urn:ietf:rfc:2401
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
URI
schemaschema://://authorityauthority//pathpath??queryquery
http://www.pinguin.info/cauta.php?id=Tux
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
URI
Caractere rezervate: ; / ? : @ & = + $ ,
Se codifică în baza 16, precedate de %
Exemplu: Spaţiul va deveni %20
De De cece??
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
URI
URL‐uri absolute http://www.infoiasi.ro/~busaco/cv.html
URL‐uri relative../../csb.css
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
URI
“Fragmente” dintr‐un conținut pot fireferite prin URIref
(referințe, fragment identifiers)URI#URIref
index.html#resurse
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
URI
O resursa Web poate fi identificatade unul sau mai multe URI‐uri
URI aliases (de evitat)
Utilizarea URI‐urilor trebuie sa fie consistenta
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
URI
URI‐urile trebuie considerate opace(nu trebuie “ghicit” tipul continutuluiinspectind URI‐ul asociat resursei)
Starea resursei poate evolua in timp,dar URI‐ul asociat ei nu
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
IRI
Internationalized Resource IdentifierComplementar URI‐ului – vezi RFC 3987
Permite folosirea unor caractere din seturi decaractere mai largi decit ASCII – e.g., Unicode
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
IRI
Exemplu:
http://color.org/rosé este identic cu URI‐ulhttp://color.org/rosé (in HTML/XML) sauhttp://color.org/rosé (in XML) si poate fireprezentat vizual prin http://color.org/rosé
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
intrebare
Cum are loc transferul?
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP
HyperText Transfer Protocol
Bazat pe TCP/IP – vezi RFC 2616
Protocol fiabil, de tip cerere/raspunsPort standard de acces: 80
HTTP/0.9, HTTP/1.0, HTTP/1.1
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP
Componente principaleServer Web (daemon – “spirit protector”: httpd)Apache, MS Internet Information Services etc.
Client Web (navigator, browser, robot,…)Netscape, Mozilla (Firefox), Internet Explorer, Opera, wget, Teleport, iTunes,…
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP
Cererea & răspunsulAccesarea (eventual, modificarea)reprezentării resursei via URI‐ul asociat
Server Web
Client Web
cerere
răspuns
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: termeni
MesajUnitatea de baza a unei comunicatii HTTP
(cerere sau raspuns)
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: termeni
IntermediarProxyPoartaTunel
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: termeni
ProxyLocalizat in proximitatea utilizatoruluiAre rol atat de server, cat si de client
Server Web
Client Web P
roxy
![Page 52: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/52.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: termeni
Poarta (gateway)Intermediar care ascunde serverul tinta,
clientul nestiind aceasta
PoartaWeb
Client Web
Server
Server
![Page 53: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/53.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: termeni
TunelRol de retransmitere (eventual, criptata)
a mesajului
![Page 54: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/54.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: termeni
CacheDepozit local de stocare – în memorie, pe disc –a mesajelor (datelor) la nivel de server/client
![Page 55: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/55.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: mesaje
Mesaj HTTP = antet + corp
Antet = multime de cimpuriMessage-header ::= field-name “:” [ field-value ] CRLF
![Page 56: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/56.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: mesaje
Cerere HTTP:Request ::= Method Request-URI ProtocolVersion CRLF[ Message-header ] [ CRLF MIME-data ]GET /index.html HTTP/1.1 CRLF Host: www.pinguin.info
Raspuns HTTP:Status-line ::= HTTP-version Digit Digit Digit Reason CRLFHTTP/1.1 200 OK CRLF …
![Page 57: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/57.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: metode
GETcerere de acces la reprezentarea
unei resurse (e.g., cod HTML, CSS, SVG, PDF,…)
![Page 58: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/58.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: metode
HEADsimilara cu GET, dar in mod uzual
se doresc doar meta‐informatii (e.g., tipul)
![Page 59: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/59.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: metode
POSTutilizata pentru trimiterea unor entitati
(date, actiuni) spre server
e.g., datele dintr‐un formular
![Page 60: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/60.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: metode
PUTplaseaza reprezentarea unei resurse pe server
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: metode
OPTIONSfurnizeaza optiunile dialogului intre client & server
(e.g., negocierea reprezentarii)
![Page 62: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/62.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: metode
DELETEsterge o resursa (reprezentarea ei) de pe server
![Page 63: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/63.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: reprezentari ale resursei
Codificarea setului de caractere (encoding)
ISO‐8859‐1 (implicit), ISO‐8859‐2,…
![Page 64: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/64.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: reprezentari ale resursei
Tipul continutului resurseiMIME type
Veziurmatoareleslide‐uri
![Page 65: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/65.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: reprezentari ale resursei
Codificarea mesajelorcomprimare, asigurarea identitatii
si/sau integritatii
gzip, compress,…
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: reprezentari ale resursei
Formatul reprezentariitext (HTML, text obisnuit, XML,...) sau binar
![Page 67: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/67.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: cimpuri (atribute)
ContentType MIME (Multipurpose Internet Mail Extensions)
Specifica un set de tipuri primare de continut+ subtipuri aditionale
Permite transferul datelor de orice tip
Content-Type: tip/subtip
![Page 68: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/68.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: cimpuri (atribute)
Tipuri MIME principaletext desemneaza formate textualetext/plain – fisier text neformatattext/html – document HTML(HyperText Markup Language)text/css – foaie de stiluri CSS(Cascading Style Sheet)
![Page 69: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/69.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: cimpuri (atribute)
Tipuri MIME principaleimage specifica formate graficeimage/gif – imagini in format GIF(Graphical Interchange Format)image/jpeg – fotografii in format JPEG(Joint Picture Experts Group)image/png – imagini PNG(Portable Network Graphics)
![Page 70: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/70.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: cimpuri (atribute)
Tipuri MIME principaleaudio desemneaza continuturi sonoreaudio/mpeg – fisier MP3 – specificatia privitoare la date audio a standardului MPEG (Motion Picture Experts Group)
![Page 71: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/71.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: cimpuri (atribute)
Tipuri MIME principalevideo defineste continuturi video (animatii, filme)video/mpeg – fisier MPEG(Motion Picture Experts Group)
![Page 72: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/72.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: cimpuri (atribute)
Tipuri MIME principaleapplication defineste aplicatiile ce vor fi executate la nivel de clientapplication/executable – program executabilapplication/javascript – program JavaScriptapplication/octetstream – sir de octeti
![Page 73: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/73.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: cimpuri (atribute)
Tipuri MIME principalemultipart utilizat pentru transferul datelor compusemultipart/mixed – continut mixtmultipart/alternative – continuturi alternative
![Page 74: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/74.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: cimpuri (atribute)
Location
Location “:” “http://” host [ “:” port ] [ abs_path ]
Location: http://www.infoiasi.ro:8080/s-a_mutat.html
folosit la redirectarea spre o alta reprezentare a resursei
URL encoding
![Page 75: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/75.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: cimpuri (atribute) – altele
Accept – specifica tipul/tipurile de reprezentareacceptate de client, plus calitatea
Cache‐Control – stabileste parametrii de controlai cache‐ului (la nivel de proxy, uzual)
Referer – desemneaza URI‐ul resurseicare a referit resursa curenta
![Page 76: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/76.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: cimpuri (atribute) – altele
Host – specifica adresa masinii de pe care se solicita accesul la o resursa
Authorization si WWW‐Authenticate – utilizatela autentificarea accesului la o resursa protejata
Alte detalii la www.w3.org/Protocols/HTTP/
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: starea
Coduri de informare (1xx)100 Continue, 101 Switching Protocols
Coduri de succes (2xx)200 Ok, 201 Created, 202 Accepted
Coduri de redirectare (3xx)300 Multiple Choices, 302 Moved Temporarily
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: starea
Coduri de eroare client (4xx)400 Bad Request, 403 Forbidden, 404 Not Found
Coduri de eroare server (5xx)501 Not Implemented, 503 Service Unavailable
Coduri de avertisment: 0..99
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: jurnalizarea cererilor
dyn419.win.tue.nl – licenta [29/Sep/2007:11:08:04 +0300] "GET /~busaco/teach/bsc2006/ HTTP/1.1" 200 24757
dyn419.win.tue.nl – – [29/Sep/2007:11:07:54 +0300] "GET /~busaco/teach/bsc2006 HTTP/1.1" 401 1283
193.226.24.219 – – [29/Sep/2007:11:06:17 +0300] "GET / HTTP/1.1" 403 1039
crawl.googlebot.com – – [29/Sep/2007:11:05:59 +0300] "GET /~busaco/paint/days/trio.jpg HTTP/1.1" 304 –
proxy.info.uaic.ro – – [29/Sep/2007:11:05:38 +0300] "GET /favicon.ico HTTP/1.1" 404 1035
rat.cluj.astral.ro – – [29/Sep/2007:11:04:27 +0300] "GET /~linux/ HTTP/1.0" 200 4974
triton.france3.fr – – [29/Sep/2007:11:04:27 +0300] "GET /~acf/ HTTP/1.1" 200 446
triton.france3.fr – – [29/Sep/2007:11:04:27 +0300] "GET /~acf HTTP/1.1" 301 327
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: exemplu cerere
GET / HTTP/1.1Host: www.pinguin.infoUser-Agent: Mozilla/5.0 (X11; U; Linux i686; en-
US; rv:1.8.0.5) Gecko/20060719 Firefox/1.5.0.5Accept: text/html, image/gif, image/jpeg, */*Accept-Language: en-usAccept-Encoding: gzip,deflate,compress,identityConnection: Keep-Alive
metoda
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
HTTP: exemplu raspuns
HTTP/1.1 302 FoundDate: Tue, 29 Jan 2008 07:17:13 GMTServer: Apache/2.0.54 (Win32) PHP/5.0.4Location: http://www.pinguin.info/index.htmlContent-Length: 295Connection: closeContent-Type: text/html; charset=iso-8859-1<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><html><head><title>302 Found</title></head><body><h1>Found</h1><p>The document has moved <a href="http://www.pinguin.info/index.html">here</a>.</p><hr /><address>Apache/2.0.54 Server at www.pinguin.info Port 80</address></body></html>
stareacimpuri
continut
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
privire de ansamblu
Web‐ul = spatiu informational compusdin elemente de interes, numite resurse,
desemnate de identificatori globali – URI/IRI
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
privire de ansamblu
Aspecte de interesIdentificareaInteractiunea
Reprezentarea prin formate de date
Detalii la www.w3.org/TR/webarch/(recomandare W3C, 2004)
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
privire de ansamblu
Identificarea resurselorFiecare resursa trebuie sa fie adresabilaFiecarei resurse i se asigneaza un URI distinct (reducerea coliziunilor)
Un URI va avea un proprietar(persoana, organizatie, specificatie,...)
De incurajat utilizarea consistenta a URI‐urilorOpacitatea URI – natura unei resurse nu este datade adresa (URI), ci de reprezentare
![Page 85: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/85.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
privire de ansamblu
InteractiuneaAgent Web = persoane ori software actionind peWebAgent‐utilizator = software actionind in numeleunui utilizator (uman)
Agent software = servere, proxy‐uri, roboti, navigatoare, player‐e multimedia etc.
Comunicarea intre agenti implica URI‐uri, mesaje sidate, via protocoale (HTTP, FTP, SOAP, SMTP,...)
Un mesaj poate fi compus din date & meta‐date (date descriind date)
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
privire de ansamblu
InteractiuneaAccesul la o resursa se realizeaza prin URI (dereferentiere), eventual implicind mai multi pasi, rezultind o reprezentare a resursei
O reprezentare desemneaza datele ce codificainformatia despre starea unei resurse
Siguranta interactiunii – agentul nu realizeaza nicio actiune colaterala (sideeffects) in cadrulinteractiunii
Preluarea unei resurse (retrieval) trebuie sa fie sigura
![Page 87: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/87.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
privire de ansamblu
Reprezentarea prin formate de dateWeb‐ul nu impune utilizarea unor formate de date, dar incurajeaza refolosirea celor existente
Aspecte importante: formate binare vs. textuale, controlul versiunilor, extensibilitatea, compunerea formatelor, separarea continutului, prezentarii & interactiunii
Hipertextul = includerea, via URI‐uri, de referintela alte resurse in cadrul unei resurse
Legatura in sensul de “relatie”, nu de “conectare fizica”
![Page 88: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/88.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
situri & aplicatii Web
Sit Websistem pe care ruleaza un server Web gazduindo serie de pagini (documente) WWW inrudite– ale unei organizatii, companii sau persoane
![Page 89: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/89.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
situri & aplicatii Web
Sit WebOfera informatii unitare
Are asociata o adresa publica (vizibila), bazata pe un domeniu Internet
Serverul Web poate gestiona simultanmai multe situri – gazduire virtuala
Poate fi disponibil in intranet sau extranet
![Page 90: Web - Arhitectura Web](https://reader030.fdocumente.com/reader030/viewer/2022012401/547b2996b4af9fbe158b4eaf/html5/thumbnails/90.jpg)
Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
situri & aplicatii Web
Aplicatie Webcolectie interconectata de pagini Web
cu continut generat dinamic, menita a oferiutilizatorilor o functionalitate specifica
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
situri & aplicatii Web
Aplicatie WebInteractiunea dintre aplicatie si utilizatori are loc
via o interfataWeb
Uzual, sit Web = aplicatie Web
Exemple: Amazon, Blogger, Expedia, Flickr, Kartoo, PHPMyAdmin, webmin, Wikipedia, YouTube etc.
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
situri & aplicatii Web
Arhitectura unei aplicatii Web
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
TehnologiiTehnologii WebWeb <?xml version=“1.0” ?><curs desc=“…” />
rezumat
Spatiul World‐Wide WebHipertextul
Identificatori uniformi de resurseProtocolul HTTP
Privire de ansamblu
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Dr. Sabin Buraga http://www.infoiasi.ro/~busaco/
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