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what is soap
 

what is soap

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    what is soap what is soap Presentation Transcript

    • SOAP TECHNOLOGY
      • What is SOAP ?
        • SOAP is a simple, lightweight XML protocol for exchanging exchanging structured and typed information on the Web
        • Extensible
        • No application semantics and no transport semantics
    • Who is drafting SOAP ?
      • UserLand, Ariba, CommerceOne, Compaq, Developmentor, HP, IBM, IONA, Lotus, Microsoft, SUN and SAP.
      • SOAP specification v1.1 already a W3C standard. v1.2 has recently been submitted.
    • Why SOAP?
      • Important need in Internet application development to allow communication between apps.
      • The politics of serialization : Several large factions each loyal to its own particular RPC ( remote procedure call ) protocol - DCOM, CORBA , Java RMI
      • SOAP addresses the interoperability issue at the data serialization level
    • Bringing down the walls
      • These systems could interact using bridges but they add costs and hurt performance.
      • Made decisions to standardize on one or the other ; then used message-oriented middleware for integration.
      • If Web browsers can, why not remote services?
      • SOAP - simplicity, flexibility, platform-neutrality and text-based.
    • RPC revisited
      • SOAP - a standard way of serializing the info. needed to invoke remote services into a format and transported across the wire, then recreated at destination.
      • To understand SOAP better : a look at DCOM’s RPC architecture.
      • Primary design goal of DCOM was “ location transparency ”.
    • DCOM Architecture
      • Location transparency in DCOM using the proxy/stub architecture. DCOM uses the NDR serialization scheme.
      • SOAP uses XML to structure the data serialization.
    • SOAP and...HTTP ?!
      • More than a data serialization format to do real RPC….transfer messages to the server and return the response.
      • DCOM and CORBA are incompatible when addressing endpoints, activating remote objects...
      • HTTP most conducive Internet Protocol for RPC via SOAP msgs : -URLs,Synch. Blocking, Scalable ,Secure
    • The Firewall blues
      • DCOM and CORBA IIOP not firewall friendly, use oddly-numbered ports etc.
      • HTTP traffic over port 80 usually can talk through firewalls.
      • SOAP messages treated as a new MIME type to be carried in a HTTP payload : so HTTP headers indicate packet has SOAP request , better firewall control .
    • SOAP building block
    • SOAP Building block ( cont’d )
      • A SOAP message is an ordinary XML document.
      • The XML document contains the following XML elements:
      • - A SOAP envelope , defines message content
      • - A SOAP header(optional), contains header information
      • - A SOAP body, that contains call and response information
    • A SOAP Example
      • A SOAP request embedded in an HTTP Request:
      • <SOAP-ENV:Envelope>
      • < SOAP-ENV:Body>
      • <xmlns:m=“http://www.stock.org/stock”/>
      • < m:GetStockPrice>
      • < StockName>IBM</StockName>
      • </m:GetStockPrice>
      • </SOAP-ENV:Body>
      • </SOAP-ENV:Envelope>
    • A SOAP Example (Cont’d )
      • A SOAP response embedded in an HTTP Response
      • <SOAP-ENV:Envelope>
      • < SOAP-ENV:Body>
      • <xmlns:m=“http://www.stock.org/stock”/>
      • < m:GetStockPriceResponse>
      • < StockName>113.81</StockName>
      • </m:GetStockPriceResponse>
      • </SOAP-ENV:Body>
      • </SOAP-ENV:Envelope>
    • SOAP Summary
      • SOAP is
      • - a lightweight comm. protocol
      • - is based on XML
      • - designed to communicate via HTTP
      • - not tied to any component technology or programming language.
      • - simple and extensible
      • - a W3C standard
    • Thankyou!