Web Architecture

Web Architecture

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  Web Architecture Presented By:Sudip Pudasaini Date: 22nd SEP, 2015
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  Introduction: Me lGraduated inBEIT From Nepal College Of Information Technology (NCIT, 2012) . lWorked in Himalaya College Of Engineering as a Teacher. lWorked for 9 months. lCurrently working in Leapfrog Technology Nepal as a Sr. Quality Assurance Engineer. lIt's been almost 3 years. lEngaged in a project First Help Financial (FHF) . lI prefer Automation and Security Testing
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  Agenda lWWW (W3) lHTTP &HTTPS lRequest vs Response lStatus Code lHTTP Verbs lTwo Tier & Three Tier
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  World Wide Web lIn1989 Sir Tim Berners - Lee Invented WWW. lSimply known as “The Web” lIs an information space where ldocuments and web resources lare identified by URIs, interlinked lby hypertext link and can be laccessed via Internet. lPrimary tool to interact on Internet lWeb Page: primarily text documents lformatted and annotated with lHTML. lWebsite: Multiple web pages with lcommon domain name.
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  HTTP & HTTPS lHTTP: lHypertextTransfer Protocol, Application Layer Protocol lUse to communicate between distributed system, hosts and clients. lCommunication usually takes place over TCP/IP, default port is 80 but other port can also be used. lCommunication takes place as Request/Response pair. lCurrent Version is HTTP/1.1
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  HTTP & HTTPS lHTTPS: lHTTPS= HTTP + SSL (Secured Socket Layer) lEncrypt and verify the integrity of traffic between the browser and server. lVerifies browser is talking to the correct server.
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  Client/Server Communication
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  Communication Failure
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  Request Vs Response lFromServer To Client lServer Get Request and send Response. lResponse Headers, Information about Server environment like content- type, content-lenght, server, etc lResponse Body, is actual response being rendered to the client's browser. lFrom Client To Server lClient Send Request and Get Response. lRequest Headers, Information about client environment like content- type, content-lenght, host, etc lRequest Body, is actual request being sent to the server
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  Status Code lOr ResponseCode, l1xx: Informational Message l2xx: Successful l3xx: Redirection l4xx: Client Error l5xx: Server Error
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  HTTP Verbs lHTTP Methods lDesiredaction to be performed on the identified resource. lHTTP/1.0 specification defines GET, POST & HEAD lHTTP/1.1 Specification added 5 new option: OPTIONS, PUT, DELETE, TRACE & CONNECT.
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  HTTP Verbs lGET: lPasses allrequest data in URL query string. lDo not change the server state.
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  HTTP Verbs lPOST: lPasses allthe request data in HTTP request body. lChange the server state by posting data.
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  HTTP Verbs lHEAD lIdentical withGET Request but with out response body. lThis is useful for retrieving meta-information written in response headers. lPUT lUse to update known resource through URI. lIf URI does not point to existing resource, new resource can be created. lDELETE lThe DELETE method deletes the specified resource.
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  Web Architecture lOverview: lLayers Ofweb application lTwo Tier Application lThree Tier Application
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  Layers Of WebApplication Presentation Layer: What user sees Client-side or “View” Logical Layer: Middle Tier, backend or “Control” Underlying processing engines and their rules Data Layer: The physical data storage layer Model
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  Two Tier Architecture ClientServer Communication Divided in to two parts Client Application (Client Tier) Database (Data Tier) Advantages: Easy to maintain and modification Faster communication Disadvantages: Can not handle multiple request
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  Three Tier Application
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  lThank You!