Re: draft-ietf-httpbis-http2-latest, 8.1.2.5 Malformed Requests and Responses, response of HEAD request

Good catch. #564...
On Jul 20, 2014 6:11 AM, "Kari Hurtta" <hurtta-ietf@elmme-mailer.org> wrote:

>
> Hypertext Transfer Protocol version 2
> draft-ietf-httpbis-http2-latest
> July 16, 2014
> http://http2.github.io/http2-spec/
>
> 2. HTTP/2 Protocol Overview
> http://http2.github.io/http2-spec/#Overview
>
> » HTTP/2 provides an optimized transport for HTTP semantics. HTTP/2
> » supports all of the core features of HTTP/1.1, but aims to be more
> » efficient in several ways.
>
> 8.1.2.5 Malformed Requests and Responses
> http://http2.github.io/http2-spec/#rfc.section.8.1.2.5
>
> » A request or response that includes an entity body can include a
> » content-length header field. A request or response is also malformed
> » if the value of a content-length header field does not equal the sum
> » of the DATA frame payload lengths that form the body.
>
> RFC 7230: Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and
>           Routing
> https://tools.ietf.org/html/rfc7230
>
> 3.3. Message Body
> https://tools.ietf.org/html/rfc7230#section-3.3
>
> »  (Section 3.1.2).  Responses to the HEAD request method (Section 4.3.2
> »  of [RFC7231]) never include a message body because the associated
> »  response header fields (e.g., Transfer-Encoding, Content-Length,
> »  etc.), if present, indicate only what their values would have been if
> »  the request method had been GET (Section 4.3.1 of [RFC7231]). 2xx
>
> 3.3.2. Content-Length
> https://tools.ietf.org/html/rfc7230#section-3.3.2
>
> »   A server MAY send a Content-Length header field in a response to a
> »   HEAD request (Section 4.3.2 of [RFC7231]); a server MUST NOT send
> »   Content-Length in such a response unless its field-value equals the
> »   decimal number of octets that would have been sent in the payload
> »   body of a response if the same request had used the GET method.
>
>
> Note conflict between Hypertext Transfer Protocol version 2
> and RFC 7230.
>
> On response of HEAD request there is (or may be) Content-Length header
> field. There is no body.
>
> Hypertext Transfer Protocol version 2 says that response
> is malformed when Content-Length header field value is
> not equal the sum of the DATA frame payload lengths that
> form the body.
>
>
> However sum of the DATA frame payload lengths that form the body
> is 0 (zero) on HEAD response, because body is not allowed. And
> Content-Length header field value must be equal of correspond
> value of GET request.
>
> / Kari Hurtta
>