Merge pull request #431 from httpwg/mnot-22

Talk about client half-close

draft-ietf-httpbis-messaging-latest.xml

@@ -1194,11 +1194,18 @@ https://www.example.org
 </ol>
 <t>
    Since there is no way to distinguish a successfully completed,
-   close-delimited message from a partially received message interrupted
+   close-delimited response message from a partially received message interrupted
    by network failure, a server &SHOULD; generate encoding or
    length-delimited messages whenever possible.  The close-delimiting
    feature exists primarily for backwards compatibility with HTTP/1.0.
 </t>
+<aside>
+  <t>
+     &Note; Request messages are never close-delimited because they are always
+     explicitly framed by length or transfer coding, with the absence of both implying
+     the request ends immediately after the header section.
+  </t>
+</aside>
 <t>
    A server &MAY; reject a request that contains a message body but
    not a <x:ref>Content-Length</x:ref> by responding with
@@ -1903,6 +1910,12 @@ https://www.example.org
    It is unknown whether the reset problem is exclusive to TCP or might also
    be found in other transport connection protocols.
 </t>
+<t>
+   Note that a TCP connection that is half-closed by the client does not
+   delimit a request message, nor does it imply that the client is no longer
+   interested in a response. In general, transport signals cannot be relied
+   upon to signal edge cases, since HTTP/1.1 is independent of transport.
+</t>
 </section>
 
 <section title="TLS Connection Closure" anchor="tls.connection.closure">
@@ -3235,6 +3248,7 @@ https://www.example.org
 
 <section title="Since draft-ietf-httpbis-messaging-10" anchor="changes.since.10">
 <ul x:when-empty="None yet.">
+   <li>In <xref target="message.body.length"/>, note that TCP half-close does not delimit a request; talk about corresponding server-side behaviour in <xref target="persistent.tear-down"/> (<eref target="https://github.com/httpwg/http-core/issues/22"/>)</li>
    <li>Moved requirements specific to HTTP/1.1 from <xref target="Semantics"/> into <xref target="request.target"/> (<eref target="https://github.com/httpwg/http-core/issues/182"/>)</li>
    <li>In <xref target="field.transfer-encoding"/> (<x:ref>Transfer-Encoding</x:ref>), adjust ABNF to allow empty lists (<eref target="https://github.com/httpwg/http-core/issues/210"/>)</li>
    <li>Moved definitions of "TE" and "Upgrade" into <xref target="Semantics"/> (<eref target="https://github.com/httpwg/http-core/issues/392"/>)</li>