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8/20/2019 Computer network anf Http protocol
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HTTP ProtocolInstructor: Prof. Dr. Friedbert Kaspar
Mai Nam Chuong
!" #I$ %&'% ( Computer Net)or*s
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∗De+nitions
∗HTTP Communication chain
∗HTTP Transport binding
∗HTTP Methods
∗HTTP Messages
∗HTTP $tatus Codes
∗HTTP Caching
∗,-
genda
%
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∗
set of rules and regulations thatdetermine ho) data istransmitted.
Communication Protocol/
0
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1 2$I la3ers
HTTP4 $MTP4 FTP4
DN$5
6
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∗
pplication 7s. pplication la3er∗ pplication la3er pro7ides ser7icesfor user applications to use. 2r4
∗ "ser applications use protocols that
reside at the application la3er.∗ 89: Internet 89plorer ( HTTP 2utloo*
( $MTP
pplication la3er/
;
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∗H3perte9t Transfer Protocol∗ an applicationFC
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HTTP protocol/
1
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∗
Histor3∗ 'BB& ( HTTPA&.B∗ 'BB? ( HTTPA'.&
∗ 'BBB ( HTTPA'.'
∗ Ne9t HTTPA%.& =draft@
HTTP protocol/
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∗ The HTTP protocol is areuestAresponse protocol
∗ client sends a reuest to theser7er
∗ The ser7er responds data
HTTP Communication
chain
>euest
>esponse
HTTP Client HTTP $er7erB
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∗HTTP >euestA>esponse Chain
)ith Intermediaries
HTTP Communication
chain
>euest
>esponse
HTTP ClientHTTP $er7erIntermediar3
>euest
>esponse
Pro93!ate)a3
'&
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∗Do not remember pre7iousreuestAresponse chain
HTTP stateless protocol
>euest '
>esponse '
HTTP Client HTTP $er7er
>euest %>esponse %
Ho) to maintain state/
''
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∗ Transitor3 connection∗ 2ne connection is created for each
reuestAresponse
∗Persistent connection
∗ The connection is *ept open after eachreuestAresponse set until the client isdone reuesting all the documents.
HTTP Transport binding
'%
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∗GET < >euests data from aspeci+ed resource
∗POST < $ubmits data to beprocessed to a speci+ed resource
HTTP !8T 7s. P2$T
'6
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HTTP !8T 7s. P2$T
';
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∗Communication bet)een de7icesusing the HTTP ta*es place7ia HTTP messages
∗ T)o t3pes:requests and responses.
∗ Te9t
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HTTP >euest Message
'1
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∗Host:
∗$peci+es the Internet host
∗Host: ))).7gu.edu.7n:&&
∗User-A!ent∗$peci+es )hat agent =application@ is sending thereuest
∗"ser
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HTTP >esponse Message
%&
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∗Ser%er
∗ $er7er info that ser7es the reuest∗ $er7er: pacheA%.6.' ="ni9@
∗E&pres∗ gi7es the dateAtime after )hich the response is
considered
∗ 89pires: Thu4 %& ul %&'0 '?:&&:&& !MT
∗Re$resh∗ "sed in redirection4 or )hen a ne) resource has been
created.
∗
>efresh: ; urlJhttp:AA))).7gu.edu.7n
HTTP >esponse Headers
%'
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∗'&& (In$oratona) >euest recei7ed4 ser7er is
continuing the process.∗+&& (S"ccess): The reuest )as successfull3
recei7ed4 understood4 accepted and ser7iced.
∗,&& (Redrecton): Further action must be ta*en inorder to complete the reuest.
∗&& (Cent Error): The reuest contains bad s3nta9or cannot be understood.
∗.&& (Ser%er Error): The ser7er failed to ful+ll anapparentl3 7alid reuest.
HTTP $tatus codes
%%
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∗+// O0 : The reuest is ful+lled.
∗,/' 1o%e Peranent2: Theresource reuested for has beenpermanentl3 mo7ed to a ne)
location∗,/ Not 1od3ed: $er7er noti+es
that the resource reuested has notbeen modi+ed.
Common HTTP $tatus
codes
%0
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∗// 4ad Re5"est: $er7er could notunderstand the reuest =s3nta9 error@.
∗/' A"thentcaton Re5"red: Thereuested resource is protected4 andreuire clientLs credential.
∗/, 6or7dden: $er7er refuses tosuppl3 the resource4 regardless ofidentit3 of client.
∗/ Not 6o"nd: The reuested
resource cannot be found in the ser7er.
Common HTTP $tatus
codes
%6
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∗.// Interna Ser%er Error: $er7er iserror in the ser7er
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∗Cache: local cop3 of a resource
HTTP Caching
>euest
>esponse
HTTP ClientIntermediar3
>euest
>esponse
HTTP $er7er
%1
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∗alidation Model∗ hen the resource last changed/
∗ 8liminate full response to client
∗ >educe net)or* band)idth
∗ If
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∗>FC
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