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‎draft-ietf-moq-transport.html‎

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</tr></thead>
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<tfoot><tr>
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<td class="left">Nandakumar, et al.</td>
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<td class="center">Expires 25 May 2026</td>
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<td class="center">Expires 29 May 2026</td>
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<td class="right">[Page]</td>
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</tr></tfoot>
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</table>
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<dd class="internet-draft">draft-ietf-moq-transport-latest</dd>
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<dt class="label-published">Published:</dt>
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<dd class="published">
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<time datetime="2025-11-21" class="published">21 November 2025</time>
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<time datetime="2025-11-25" class="published">25 November 2025</time>
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</dd>
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<dt class="label-intended-status">Intended Status:</dt>
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<dd class="intended-status">Standards Track</dd>
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<dt class="label-expires">Expires:</dt>
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<dd class="expires"><time datetime="2026-05-25">25 May 2026</time></dd>
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<dd class="expires"><time datetime="2026-05-29">29 May 2026</time></dd>
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<dt class="label-authors">Authors:</dt>
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<dd class="authors">
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<div class="author">
@@ -1142,7 +1142,7 @@ <h2 id="name-status-of-this-memo">
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time. It is inappropriate to use Internet-Drafts as reference
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material or to cite them other than as "work in progress."<a href="#section-boilerplate.1-3" class="pilcrow"></a></p>
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<p id="section-boilerplate.1-4">
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This Internet-Draft will expire on 25 May 2026.<a href="#section-boilerplate.1-4" class="pilcrow"></a></p>
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This Internet-Draft will expire on 29 May 2026.<a href="#section-boilerplate.1-4" class="pilcrow"></a></p>
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</section>
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</div>
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<div id="copyright">
@@ -1523,10 +1523,10 @@ <h2 id="name-copyright-notice">
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<p id="section-toc.1-1.11.1"><a href="#section-11" class="auto internal xref">11</a>. <a href="#name-extension-headers" class="internal xref">Extension Headers</a></p>
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<ul class="compact toc ulBare ulEmpty">
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<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.11.2.1">
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<p id="section-toc.1-1.11.2.1.1"><a href="#section-11.1" class="auto internal xref">11.1</a>.  <a href="#name-prior-group-id-gap" class="internal xref">Prior Group ID Gap</a></p>
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<p id="section-toc.1-1.11.2.1.1"><a href="#section-11.1" class="auto internal xref">11.1</a>.  <a href="#name-immutable-extensions" class="internal xref">Immutable Extensions</a></p>
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</li>
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<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.11.2.2">
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<p id="section-toc.1-1.11.2.2.1"><a href="#section-11.2" class="auto internal xref">11.2</a>.  <a href="#name-immutable-extensions" class="internal xref">Immutable Extensions</a></p>
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<p id="section-toc.1-1.11.2.2.1"><a href="#section-11.2" class="auto internal xref">11.2</a>.  <a href="#name-prior-group-id-gap" class="internal xref">Prior Group ID Gap</a></p>
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</li>
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<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.11.2.3">
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<p id="section-toc.1-1.11.2.3.1"><a href="#section-11.3" class="auto internal xref">11.3</a>.  <a href="#name-prior-object-id-gap" class="internal xref">Prior Object ID Gap</a></p>
@@ -6506,86 +6506,42 @@ <h2 id="name-extension-headers">
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<a href="#section-11" class="section-number selfRef">11. </a><a href="#name-extension-headers" class="section-name selfRef">Extension Headers</a>
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</h2>
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<p id="section-11-1">The following Object Extension Headers are defined in MOQT.<a href="#section-11-1" class="pilcrow"></a></p>
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<div id="prior-group-id-gap">
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<section id="section-11.1">
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<h3 id="name-prior-group-id-gap">
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<a href="#section-11.1" class="section-number selfRef">11.1. </a><a href="#name-prior-group-id-gap" class="section-name selfRef">Prior Group ID Gap</a>
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</h3>
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<p id="section-11.1-1">Prior Group ID Gap (Extension Header Type 0x3C) is a variable length integer
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containing the number of Groups prior to the current Group that do not and will
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never exist. For example, if the Original Publisher is publishing an Object in
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Group 7 and knows it will never publish any Objects in Group 8 or Group 9, it
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can include Prior Group ID Gap = 2 in any number of Objects in Group 10, as it
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sees fit. A Track is considered malformed (see <a href="#malformed-tracks" class="auto internal xref">Section 2.4.2</a>) if any of
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the following conditions are detected:<a href="#section-11.1-1" class="pilcrow"></a></p>
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<ul class="normal">
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<li class="normal" id="section-11.1-2.1">
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<p id="section-11.1-2.1.1">An Object contains more than one instance of Prior Group ID Gap.<a href="#section-11.1-2.1.1" class="pilcrow"></a></p>
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</li>
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<li class="normal" id="section-11.1-2.2">
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<p id="section-11.1-2.2.1">A Group contains more than one Object with different values for Prior Group
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ID Gap.<a href="#section-11.1-2.2.1" class="pilcrow"></a></p>
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</li>
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<li class="normal" id="section-11.1-2.3">
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<p id="section-11.1-2.3.1">An Object has a Prior Group ID Gap larger than the Group ID.<a href="#section-11.1-2.3.1" class="pilcrow"></a></p>
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</li>
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<li class="normal" id="section-11.1-2.4">
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<p id="section-11.1-2.4.1">An endpoint receives an Object with a Prior Group ID Gap covering an Object
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it previously received.<a href="#section-11.1-2.4.1" class="pilcrow"></a></p>
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</li>
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<li class="normal" id="section-11.1-2.5">
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<p id="section-11.1-2.5.1">An endpoint receives an Object with a Group ID within a previously
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communicated gap.<a href="#section-11.1-2.5.1" class="pilcrow"></a></p>
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</li>
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</ul>
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<p id="section-11.1-3">This extension is optional, as publishers might not know the prior gap gize, or
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there may not be a gap. If Prior Group ID Gap is not present, the receiver
6543-
cannot infer any information about the existence of prior groups (see
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<a href="#group-ids" class="auto internal xref">Section 2.3.1</a>).<a href="#section-11.1-3" class="pilcrow"></a></p>
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<p id="section-11.1-4">This extension can be added by the Original Publisher, but <span class="bcp14">MUST NOT</span> be added by
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relays. This extension <span class="bcp14">MAY</span> be removed by relay when the object in question is
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served via FETCH, and the gap that the extension communicates is already
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communicated implicitly in the FETCH response; it <span class="bcp14">MUST NOT</span> be modified or
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removed otherwise.<a href="#section-11.1-4" class="pilcrow"></a></p>
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<p id="section-11.1-5">An Object <span class="bcp14">MUST NOT</span> contain more than one instance of this extension header.<a href="#section-11.1-5" class="pilcrow"></a></p>
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</section>
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</div>
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<div id="immutable-extensions">
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<section id="section-11.2">
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<section id="section-11.1">
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<h3 id="name-immutable-extensions">
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<a href="#section-11.2" class="section-number selfRef">11.2. </a><a href="#name-immutable-extensions" class="section-name selfRef">Immutable Extensions</a>
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<a href="#section-11.1" class="section-number selfRef">11.1. </a><a href="#name-immutable-extensions" class="section-name selfRef">Immutable Extensions</a>
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</h3>
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<p id="section-11.2-1">The Immutable Extensions (Extension Header Type 0xB) contains a sequence of
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<p id="section-11.1-1">The Immutable Extensions (Extension Header Type 0xB) contains a sequence of
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Key-Value-Pairs (see <a href="#moq-key-value-pair" class="auto internal xref">Figure 2</a>) which are also Object Extension
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Headers of the Object.<a href="#section-11.2-1" class="pilcrow"></a></p>
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<div class="alignLeft art-text artwork" id="section-11.2-2">
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Headers of the Object.<a href="#section-11.1-1" class="pilcrow"></a></p>
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<div class="alignLeft art-text artwork" id="section-11.1-2">
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<pre>
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Immutable Extensions {
65646520
Type (0xB),
65656521
Length (i),
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Key-Value-Pair (..) ...
65676523
}
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</pre><a href="#section-11.2-2" class="pilcrow"></a>
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</pre><a href="#section-11.1-2" class="pilcrow"></a>
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</div>
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<p id="section-11.2-3">This extension can be added by the Original Publisher, but <span class="bcp14">MUST NOT</span> be added by
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<p id="section-11.1-3">This extension can be added by the Original Publisher, but <span class="bcp14">MUST NOT</span> be added by
65716527
Relays. This extension <span class="bcp14">MUST NOT</span> be modified or removed. Relays <span class="bcp14">MUST</span> cache this
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extension if the Object is cached and <span class="bcp14">MUST</span> forward this extension if the
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enclosing Object is forwarded. Relays <span class="bcp14">MAY</span> decode and view these extensions.<a href="#section-11.2-3" class="pilcrow"></a></p>
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<p id="section-11.2-4">A Track is considered malformed (see <a href="#malformed-tracks" class="auto internal xref">Section 2.4.2</a>) if any of the
6575-
following conditions are detected:<a href="#section-11.2-4" class="pilcrow"></a></p>
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enclosing Object is forwarded. Relays <span class="bcp14">MAY</span> decode and view these extensions.<a href="#section-11.1-3" class="pilcrow"></a></p>
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<p id="section-11.1-4">A Track is considered malformed (see <a href="#malformed-tracks" class="auto internal xref">Section 2.4.2</a>) if any of the
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following conditions are detected:<a href="#section-11.1-4" class="pilcrow"></a></p>
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<ul class="normal">
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<li class="normal" id="section-11.2-5.1">
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<p id="section-11.2-5.1.1">An Object contains an Immutable Extensions header that contains another
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Immutable Extensions key.<a href="#section-11.2-5.1.1" class="pilcrow"></a></p>
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<li class="normal" id="section-11.1-5.1">
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<p id="section-11.1-5.1.1">An Object contains an Immutable Extensions header that contains another
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Immutable Extensions key.<a href="#section-11.1-5.1.1" class="pilcrow"></a></p>
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</li>
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<li class="normal" id="section-11.2-5.2">
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<p id="section-11.2-5.2.1">A Key-Value-Pair cannot be parsed.<a href="#section-11.2-5.2.1" class="pilcrow"></a></p>
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<li class="normal" id="section-11.1-5.2">
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<p id="section-11.1-5.2.1">A Key-Value-Pair cannot be parsed.<a href="#section-11.1-5.2.1" class="pilcrow"></a></p>
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</li>
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</ul>
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<p id="section-11.2-6">The following figure shows an example Object structure with a combination of
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<p id="section-11.1-6">The following figure shows an example Object structure with a combination of
65866542
mutable and immutable extensions and end to end encrypted metadata in the Object
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payload.<a href="#section-11.2-6" class="pilcrow"></a></p>
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<div class="alignLeft art-text artwork" id="section-11.2-7">
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payload.<a href="#section-11.1-6" class="pilcrow"></a></p>
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<div class="alignLeft art-text artwork" id="section-11.1-7">
65896545
<pre>
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Object Header Object Payload
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&lt;------------------------------------------------&gt; &lt;-------------------&gt;
@@ -6598,9 +6554,53 @@ <h3 id="name-immutable-extensions">
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x = e2e Authenticated Data
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y = e2e Encrypted Data
66006556
EXT 1 and EXT N can be modified or removed by Relays
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</pre><a href="#section-11.2-7" class="pilcrow"></a>
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</pre><a href="#section-11.1-7" class="pilcrow"></a>
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</div>
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<p id="section-11.1-8">An Object <span class="bcp14">MUST NOT</span> contain more than one instance of this extension header.<a href="#section-11.1-8" class="pilcrow"></a></p>
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</section>
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</div>
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<p id="section-11.2-8">An Object <span class="bcp14">MUST NOT</span> contain more than one instance of this extension header.<a href="#section-11.2-8" class="pilcrow"></a></p>
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<div id="prior-group-id-gap">
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<section id="section-11.2">
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<h3 id="name-prior-group-id-gap">
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<a href="#section-11.2" class="section-number selfRef">11.2. </a><a href="#name-prior-group-id-gap" class="section-name selfRef">Prior Group ID Gap</a>
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</h3>
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<p id="section-11.2-1">Prior Group ID Gap (Extension Header Type 0x3C) is a variable length integer
6568+
containing the number of Groups prior to the current Group that do not and will
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never exist. For example, if the Original Publisher is publishing an Object in
6570+
Group 7 and knows it will never publish any Objects in Group 8 or Group 9, it
6571+
can include Prior Group ID Gap = 2 in any number of Objects in Group 10, as it
6572+
sees fit. A Track is considered malformed (see <a href="#malformed-tracks" class="auto internal xref">Section 2.4.2</a>) if any of
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the following conditions are detected:<a href="#section-11.2-1" class="pilcrow"></a></p>
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<ul class="normal">
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<li class="normal" id="section-11.2-2.1">
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<p id="section-11.2-2.1.1">An Object contains more than one instance of Prior Group ID Gap.<a href="#section-11.2-2.1.1" class="pilcrow"></a></p>
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</li>
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<li class="normal" id="section-11.2-2.2">
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<p id="section-11.2-2.2.1">A Group contains more than one Object with different values for Prior Group
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ID Gap.<a href="#section-11.2-2.2.1" class="pilcrow"></a></p>
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</li>
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<li class="normal" id="section-11.2-2.3">
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<p id="section-11.2-2.3.1">An Object has a Prior Group ID Gap larger than the Group ID.<a href="#section-11.2-2.3.1" class="pilcrow"></a></p>
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</li>
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<li class="normal" id="section-11.2-2.4">
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<p id="section-11.2-2.4.1">An endpoint receives an Object with a Prior Group ID Gap covering an Object
6587+
it previously received.<a href="#section-11.2-2.4.1" class="pilcrow"></a></p>
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</li>
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<li class="normal" id="section-11.2-2.5">
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<p id="section-11.2-2.5.1">An endpoint receives an Object with a Group ID within a previously
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communicated gap.<a href="#section-11.2-2.5.1" class="pilcrow"></a></p>
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</li>
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</ul>
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<p id="section-11.2-3">This extension is optional, as publishers might not know the prior gap gize, or
6595+
there may not be a gap. If Prior Group ID Gap is not present, the receiver
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cannot infer any information about the existence of prior groups (see
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<a href="#group-ids" class="auto internal xref">Section 2.3.1</a>).<a href="#section-11.2-3" class="pilcrow"></a></p>
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<p id="section-11.2-4">This extension can be added by the Original Publisher, but <span class="bcp14">MUST NOT</span> be added by
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relays. This extension <span class="bcp14">MAY</span> be removed by relay when the object in question is
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served via FETCH, and the gap that the extension communicates is already
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communicated implicitly in the FETCH response; it <span class="bcp14">MUST NOT</span> be modified or
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removed otherwise.<a href="#section-11.2-4" class="pilcrow"></a></p>
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<p id="section-11.2-5">An Object <span class="bcp14">MUST NOT</span> contain more than one instance of this extension header.<a href="#section-11.2-5" class="pilcrow"></a></p>
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</section>
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</div>
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<div id="prior-object-id-gap">

‎draft-ietf-moq-transport.txt‎

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Media Over QUIC S. Nandakumar
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Internet-Draft Cisco
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Intended status: Standards Track V. Vasiliev
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Expires: 25 May 2026 I. Swett, Ed.
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Expires: 29 May 2026 I. Swett, Ed.
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Google
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A. Frindell, Ed.
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Meta
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21 November 2025
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25 November 2025
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1414

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Media over QUIC Transport
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time. It is inappropriate to use Internet-Drafts as reference
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material or to cite them other than as "work in progress."
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This Internet-Draft will expire on 25 May 2026.
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This Internet-Draft will expire on 29 May 2026.
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Copyright Notice
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@@ -176,8 +176,8 @@ Table of Contents
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10.4.4. Fetch Header
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10.5. Examples
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11. Extension Headers
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11.1. Prior Group ID Gap
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11.2. Immutable Extensions
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11.1. Immutable Extensions
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11.2. Prior Group ID Gap
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11.3. Prior Object ID Gap
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12. Security Considerations
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12.1. Resource Exhaustion
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The following Object Extension Headers are defined in MOQT.
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11.1. Prior Group ID Gap
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Prior Group ID Gap (Extension Header Type 0x3C) is a variable length
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integer containing the number of Groups prior to the current Group
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that do not and will never exist. For example, if the Original
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Publisher is publishing an Object in Group 7 and knows it will never
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publish any Objects in Group 8 or Group 9, it can include Prior Group
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ID Gap = 2 in any number of Objects in Group 10, as it sees fit. A
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Track is considered malformed (see Section 2.4.2) if any of the
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following conditions are detected:
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* An Object contains more than one instance of Prior Group ID Gap.
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* A Group contains more than one Object with different values for
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Prior Group ID Gap.
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* An Object has a Prior Group ID Gap larger than the Group ID.
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* An endpoint receives an Object with a Prior Group ID Gap covering
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an Object it previously received.
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* An endpoint receives an Object with a Group ID within a previously
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communicated gap.
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This extension is optional, as publishers might not know the prior
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gap gize, or there may not be a gap. If Prior Group ID Gap is not
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present, the receiver cannot infer any information about the
4063-
existence of prior groups (see Section 2.3.1).
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This extension can be added by the Original Publisher, but MUST NOT
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be added by relays. This extension MAY be removed by relay when the
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object in question is served via FETCH, and the gap that the
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extension communicates is already communicated implicitly in the
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FETCH response; it MUST NOT be modified or removed otherwise.
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An Object MUST NOT contain more than one instance of this extension
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header.
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11.2. Immutable Extensions
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11.1. Immutable Extensions
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The Immutable Extensions (Extension Header Type 0xB) contains a
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sequence of Key-Value-Pairs (see Figure 2) which are also Object
@@ -4116,6 +4078,44 @@ EXT 1 and EXT N can be modified or removed by Relays
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An Object MUST NOT contain more than one instance of this extension
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header.
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11.2. Prior Group ID Gap
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4083+
Prior Group ID Gap (Extension Header Type 0x3C) is a variable length
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integer containing the number of Groups prior to the current Group
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that do not and will never exist. For example, if the Original
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Publisher is publishing an Object in Group 7 and knows it will never
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publish any Objects in Group 8 or Group 9, it can include Prior Group
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ID Gap = 2 in any number of Objects in Group 10, as it sees fit. A
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Track is considered malformed (see Section 2.4.2) if any of the
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following conditions are detected:
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4092+
* An Object contains more than one instance of Prior Group ID Gap.
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* A Group contains more than one Object with different values for
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Prior Group ID Gap.
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* An Object has a Prior Group ID Gap larger than the Group ID.
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* An endpoint receives an Object with a Prior Group ID Gap covering
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an Object it previously received.
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* An endpoint receives an Object with a Group ID within a previously
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communicated gap.
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4105+
This extension is optional, as publishers might not know the prior
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gap gize, or there may not be a gap. If Prior Group ID Gap is not
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present, the receiver cannot infer any information about the
4108+
existence of prior groups (see Section 2.3.1).
4109+
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This extension can be added by the Original Publisher, but MUST NOT
4111+
be added by relays. This extension MAY be removed by relay when the
4112+
object in question is served via FETCH, and the gap that the
4113+
extension communicates is already communicated implicitly in the
4114+
FETCH response; it MUST NOT be modified or removed otherwise.
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An Object MUST NOT contain more than one instance of this extension
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header.
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11.3. Prior Object ID Gap
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Prior Object ID Gap (Extension Header Type 0x3E) is a variable length

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