Original text:
bandwidth-delay product (see RFC7323). Even with full awareness of the current bandwidth-delay product, <del> implementation of flow control can be difficult.  When using flow control, the receiver MUST read from the TCP receive buffer in a timely fashion.  Failure to do so could lead to a deadlock when </del>  critical frames, such as WINDOW_UPDATE, are not read and acted upon.  5.2.3.

Reviewer comments:
Editorial change only. The idea is to read as soon as data arrives in the TCP buffer. In practice, this is not necessary, but leaving things in the TCP buffer indefinitely can deadlock. (Some implementations of over TCP-based protocols do this and in this case it is BAD.) For .
[x] 1. ----- FP: Is the working group aware that RFC 793bis is in IESG evaluation (URL) ? Was the choice of having a normative reference to 793 conscious, in order to avoid any delay that might come from publication of draft-ietf-tcpm-rfc793bis? (Just checking this was considered) [x] 2. ----- for HTTP/2 over TLS. The general TLS usage guidance in [TLSBCP] SHOULD be followed, with some additional restrictions that are specific to HTTP/2. FP: Given this requirement, I would have expected to see [TLSBCP] normatively referenced, rather than informatively. [x] 3. ----- layer. The frame and stream layers are tailored to the needs of the HTTP protocol and server push. FP: I would think the server push is part of the HTTP protocol, which makes this formulation "HTTP protocol and server push" confusing. [x] 4. ----- Type: The 8-bit type of the frame. The frame type determines the Flags: An 8-bit field reserved for boolean flags specific to the FP: I would find a reference to the IANA registry useful. [x] 5. ----- implementation of flow control can be difficult. When using flow control, the receiver MUST read from the TCP receive buffer in a timely fashion. Failure to do so could lead to a deadlock when FP: "When using flow control" might be rephrased to indicate "when flow control limits are lower than the maximum" (or something of the sort), since if I understand correctly the capability is always used, it is just the window size that changes (effectively implementing control of flow). Also "timely fashion" - I know that it is probably hard, but it would be nice to have a more precise qualification, or at least a hint of what is timely. [x] 6. ----- stream that it successfully received from its peer. The GOAWAY frame includes an error code that indicates why the connection is FP: "error code" - here as well I would have liked a reference to the IANA registry. [x] 7. ----- Exclusive: A single-bit flag. This field is only present if the PRIORITY flag is set. Stream Dependency: A 31-bit stream identifier. This field is only present if the PRIORITY flag is set. Weight: An unsigned 8-bit integer. This field is only present if the PRIORITY flag is set. FP: I would have expected to see some definition of how the fields are used. If this is defined somewhere else, a reference would be good. [x] 8. ----- SETTINGS Frame { Length (24), Type (8) = 4, Unused Flags (7), ACK Flag (1), Reserved (1), Stream Identifier (31), Setting (48) ..., } Setting { Identifier (16), Value (32), } FP: Is there any reason why the Stream Identifier line is not: Stream Identifier (31) = 0, [x] 9. ----- a server does include a value it MUST be 0. A client MUST treat receipt of a SETTINGS frame with SETTINGSENABLEPUSH set to 1 as a connection error (Section 5.4.1) of type PROTOCOLERROR. FP: This is just my curiosity: what is the reason for this stronger requirement - I would think it shouldn't be a problem for the sender if it wants to advertise that it would permit/support server push. What am I missing? [x] 10. ----- A value of 0 for SETTINGSMAXCONCURRENTSTREAMS SHOULD NOT be treated as special by endpoints. A zero value does prevent the FP: When is it ok that the 0 value is treated as special? [x] 11. ----- set. Upon receiving a SETTINGS frame with the ACK flag set, the sender of the altered settings can rely on the value having been applied. FP: nit s/value/values. Also I believe this could be misunderstood - can it be made more precise on the fact that only the values that are present in the received frame with the ACK flag set (and not those that might have been ignored because not understood) have been applied. [x] 12. ----- A receiver MUST treat the receipt of a WINDOWUPDATE frame with an flow-control window increment of 0 as a stream error (Section 5.4.2) FP: nit s/an/a [x] 13. ----- FLOWCONTROLERROR (0x3): The endpoint detected that its peer violated the flow-control protocol. STREAMCLOSED (0x5): The endpoint received a frame after a stream was half-closed. FP: would be good to add a reference to the relevant sections. [x] 14. ----- set after receiving the HEADERS frame that opens a request or after receiving a final (non-informational) status code MUST treat the FP: Where is a "non-informational status code" defined? [x] 15. ----- FP: Are the following two sentences in Section 8.1.1. in contraddiction? request or response. Malformed requests or responses that are detected MUST be treated as a stream error (Section 5.4.2) of type PROTOCOLERROR. on the remainder of the request being correct. A server or intermediary MAY use RSTSTREAM -- with a code other than REFUSEDSTREAM -- to abort a stream if a malformed request or response is received. FP: In section 5.4.2. I read: An endpoint that detects a stream error sends a RSTSTREAM frame So the first sentence above implies RSTSTREAM MUST be sent, while the second sentence states RSTSTREAM MAY be sent. [x] 16. ----- their definitions in Sections Section 5.1 of [5.1] and Section 5.5 of [5.5] of [HTTP] respectively and treat messages that contain FP: References need fixing. [x] 17. ----- from the control data of the original request, unless the the FP: nit Remove one "the" [x] 18. ----- Note that request targets for CONNECT or asterisk-form OPTIONS requests never include authority information. FP: Please add a reference to 7.1 of [HTTP] as this is the first time "asterisk-form OPTION" appear in this document. [x] 19. ----- Advertising a SETTINGSMAXCONCURRENTSTREAMS value of zero disables server push by preventing the server from creating the necessary streams. This does not prohibit a server from sending PUSHPROMISE frames; clients need to reset any promised streams that are not wanted. FP: Do these two sentences contradict each other? In the first sentence I am reading that the server can't create the necessary stream to send the PUSHPROMISE frame, in the second sentence I read that it can? [x] 20. ----- on a DATA frame is treated as being equivalent to the TCP FIN bit. A FP: Can a reference be added to the section where the TCP FIN bit is defined? [x] 21. ----- Content-Type: image/jpeg ==> - ENDSTREAM Content-Length: 123 + END_HEADERS FP: I think it would be good to add a sentence about the meaning of - and + (which I understand to be flag set or not set) in section 2.2. [x] 22. ----- treated as delimiters in other HTTP versions. An intermediary that translates an HTTP/2 request or response MUST validate fields according to the rules in Section 8.2 roles before translating a message to another HTTP version. Translating a field that includes FP: is "roles" supposed to be there? [x] 23. ----- The CONNECT method can be used to create disproportionate load on an proxy, since stream creation is relatively inexpensive when compared FP: nit s/an/a [x] 24. ----- FP: I think it would be good to keep the 3rd paragraph in Section 11 instead of asking the RFC Editor to remove it, just to keep a trace of the registries that have been defined in 7540, since those registries will now reference this document, but this document does not contain all the definitions of the different fields. [x] 25. ---- Comments: Obsolete; see Section 11.1 FP: I would suggest to be explicit and add "of this document" (unless links can be maintained in IANA registries Comments fields).
All done, closing.
Yeah, good rewording here.

Revised text:
bandwidth-delay product (see RFC7323). Even with full awareness of the current bandwidth-delay product,  <ins> implementation of flow control can be difficult.  Endpoints MUST read and process HTTP/2 frames from the TCP receive buffer as soon as data is available.  Failure to read promptly could lead to a deadlock when </ins> critical frames, such as WINDOW_UPDATE, are not read and acted upon. <ins> Reading frames promptly does not expose endpoints to resource exhaustion attacks as HTTP/2 flow control limits resource commitments. </ins> 5.2.3.