Request-Tag option

Document Type Replaced Internet-Draft (individual)
Last updated 2017-03-27
Replaced by draft-amsuess-core-repeat-request-tag
Stream (None)
Intended RFC status (None)
Expired & archived
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Stream Stream state (No stream defined)
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RFC Editor Note (None)
IESG IESG state Replaced by draft-amsuess-core-repeat-request-tag
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This memo describes an optional extension to the Constrained Application Protocol (CoAP, [RFC7252] and [RFC7959]) that allows matching of request blocks. This primarily serves to transfer the security properties that Object Security of CoAP (OSCOAP, [I-D.ietf-core-object-security]) provides for single requests to blockwise transfers. The security of blockwise transfer in OSCOAP is reflected on in a dedicated section.


Christian Amsüss (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)