[Technical Errata Reported] RFC7540 (6309)
RFC Errata System <rfc-editor@rfc-editor.org> Mon, 19 October 2020 02:08 UTC
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Subject: [Technical Errata Reported] RFC7540 (6309)
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The following errata report has been submitted for RFC7540, "Hypertext Transfer Protocol Version 2 (HTTP/2)". -------------------------------------- You may review the report below and at: https://www.rfc-editor.org/errata/eid6309 -------------------------------------- Type: Technical Reported by: Mike Bishop <mbishop@evequefou.be> Section: 5.1 Original Text ------------- Receiving any frame other than HEADERS or PRIORITY on a stream in this state MUST be treated as a connection error (Section 5.4.1) of type PROTOCOL_ERROR. ...and similar throughout the section Corrected Text -------------- Receiving any frame defined in this document other than HEADERS or PRIORITY on a stream in this state MUST be treated as a connection error (Section 5.4.1) of type PROTOCOL_ERROR. Frames of unknown types are ignored. Notes ----- Discovered via Chrome's GREASE experiment and discussed on-list, but never filed that I can find. The HTTP/2 RFC mandates tolerance of any unknown frame type, but also mandates rejection of frames which are not the few listed. The conservative solution in current deployments is, of course, to restrict sending extension frame types to open (and half-closed (remote)) streams. The text which should have been in the document to begin with, however, is that only frame types defined in the HTTP/2 specification were to be impacted by that restriction. This is already stated in section 5.1: In the absence of more specific guidance elsewhere in this document, implementations SHOULD treat the receipt of a frame that is not expressly permitted in the description of a state as a connection error (Section 5.4.1) of type PROTOCOL_ERROR. Note that PRIORITY can be sent and received in any stream state. Frames of unknown types are ignored. However, it's unclear whether the "any frame other than" language is to be construed as "more specific guidance." Instructions: ------------- This erratum is currently posted as "Reported". If necessary, please use "Reply All" to discuss whether it should be verified or rejected. When a decision is reached, the verifying party can log in to change the status and edit the report, if necessary. -------------------------------------- RFC7540 (draft-ietf-httpbis-http2-17) -------------------------------------- Title : Hypertext Transfer Protocol Version 2 (HTTP/2) Publication Date : May 2015 Author(s) : M. Belshe, R. Peon, M. Thomson, Ed. Category : PROPOSED STANDARD Source : Hypertext Transfer Protocol Bis APP Area : Applications Stream : IETF Verifying Party : IESG
- [Technical Errata Reported] RFC7540 (6309) RFC Errata System