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HTTP - Next Generation

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HTTP-NG Briefing at Internet PSIG meeting, 8 June 1998; Mike Spreitzer, ... Combines Java RMI, CORBA, DCOM. Byte-efficient. Uses session-adaptive compression ... – PowerPoint PPT presentation

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Title: HTTP - Next Generation


1
HTTP - Next Generation
  • Mike Spreitzer
  • Xerox PARC CSL
  • 8 June 1998

2
Problems with HTTP
  • Difficulty of extending/modifying HTTP
  • Emerging incompatible object systems
  • HTTP used as a reliable datagram protocol
  • Increased use of CGI-like Web services
  • Performance

3
The W3C HTTP-NG Project
  • An activity of the World Wide Web Consortium
  • Experimental What happens if we factor HTTP
    into distributed-object system application?
  • original HTTP attempted a distributed object
    protocol
  • Goals greater extensibility, simplicity,
    functionality, efficiency

4
Project Structure
  • Two working groups
  • Web Characterization Group
  • Jim Pitkow, Xerox PARC, chair
  • Study Web usage and form requirements
  • Protocol Design Group
  • Jim Gettys, Digital, chair
  • Redesign Web as a distributed object application
  • Interest Group
  • www.w3.org/Protocols/HTTP-NG/Group/IG/

5
HTTP-NG Architecture
6
Three Layer Structure
  • Web API layer on top offers object-oriented
    access to the classic Web operations
  • Messaging layer in middle provides
    state-of-the-art distributed object capabilities
  • Modular architecture for stackable byte transport
    layers
  • MUX layer addresses TCP/IP problems

7
Web Application Layer
  • Object-oriented network API for the HTTP 1.1
    specification
  • The Classic Web Application (TCWA)
  • Still under development

8
Messaging Layer
  • Simple marshalling rules
  • Small but powerful type system
  • Combines Java RMI, CORBA, DCOM
  • Byte-efficient
  • Uses session-adaptive compression
  • Based on existing IETF standards and registries

9
MUX Layer
  • Multiplexing multiple streams over single TCP/IP
    connection
  • Byte streams or opaque message streams
  • Bi-directional over same TCP/IP connection

10
Advantages of HTTP-NG
  • Efficiency
  • Extensibility
  • Simplicity

11
Efficiency
  • MUX provides for state-sharing between multiple
    parallel connections
  • Binary message formats reduce the amount of
    string parsing and formatting needed, and
    typically reduce bytes on wire
  • Careful protocol design minimizes network round
    trips

12
Extensibility
  • New interfaces can be defined to add new
    applications such as WebDAV
  • Backwards compatibility of interfaces allowed via
    subtyping of object types
  • HTTPPEPs optional/mandatory End-to-End/Hop-by-Ho
    p headers mechanism available via property list
    groups
  • Ideas on better typing too

13
Extensibility (2)
  • Extensibility in transport layer with transport
    stacking to transform message streams
  • Extensibility in messaging layer with extension
    contexts
  • Extensibility in application layer with interface
    definition, subtyping, etc.

14
Simplicity
  • Highly modular architecture
  • Low coupling between modules
  • Each module designed to be internally simple
  • Predictable architecture

15
Relationship with XML
  • XML is important in the web
  • HTTP-NG will use XML as appropriate
  • Plan to develop an RDF-based IDL
  • DOM is getting IDL, Java interfaceshope to add
    HTTP-NG interfaces

16
Project Phase 1
  • W3C Activity
  • Demonstrate basic feasibility
  • using existing ILU as testbed
  • new MUX and messaging protocols
  • robotic clients and modified Apache
  • First release of drafts in early July
  • Ends this summer
  • road show ready for September TC mtg

17
Project Phase 2
  • Starting this summer
  • W3C Activity continues (if approved)
  • IETF involvement begins

18
Come Join Us!
  • http//www.w3.org/Protocols/HTTP-NG/
  • W3C members can see all
  • Others can join the Interest Group
  • Next IETF
  • August 23--28, Chicago
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