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WG Review: Open Pluggable Edge Services (opes)
A new IETF working group has been proposed in the Applications Area.
The IESG has not made any determination as yet. Note that this is the
second review message for OPES due to changes to the original
The following Description was submitted, and is provided for
informational purposes only:
Description of Working Group:
The Internet is facilitating multiple forms of distributed
applications, some of which employ application-level intermediaries.
The Open Pluggable Edge Services (OPES) working group's primary task is
to define application-level protocols enabling such intermediaries to
incorporate services that operate on messages transported by HTTP and
RTP/RTSP. At the IP level, the participating intermediaries are
endpoints that are addressed explicitly.
The protocols to be defined provide a framework for integrating a wide
range of services into application-level intermediaries. The advantage
of standardizing such protocols is that services can be re-used across
vendor products without modifying the intermediaries or services.
Intermediary services provided in this way are not transparent: They
must be authorized by the application endpoint (either the content
requestor or the content provider) that requests the intermediary
service. A key task for the working group is to specify an appropriate
Intermediaries may employ services executed either locally or on a
remote ("callout") server. One task for this working group is the
development of callout protocols that enable the receiving callout
service to either receive encapsulated HTTP or RTP/RTSP messages or,
through some other mechanism, for the callout service to receive the
application data necessary to perform its services.
The iCAP protocol provides similar function for services operating on
iCAP-encapsulated HTTP application data. The working group will
evaluate the iCAP protocol as one candidate for passing HTTP
application data for remote services. It may decide to extend or even
not use the iCAP protocol without being obliged to retain any level of
compatibility with the current iCAP proposal.
Another task for this working group is to enumerate the requirements
for management policies and associated administrative protocols that
allow these services to be specified and deployed. This includes
requirements on the rule systems used to specify conditions under which
services are executed.
The working group will develop a security model for OPES services in
which authorization and enforcement will be defined. The model will
specify the entities, privileges, notifications, and authorization
actions affecting content. In addition, the model will show how
end-to-end services and data integrity concepts are mapped onto the
Prior related requirements document (expired but available on the web
Updated iCAP Callout Protocol:
A Rule Specification Language for Proxy Services:
OPES Network Taxonomy:
OPES Architecture for Rule Processing and Service Execution:
OMML: OPES Meta-data Markup Language:
General Use Cases: