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Add note about 103 and HTTP/2 #9563

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6 changes: 6 additions & 0 deletions source
Original file line number Diff line number Diff line change
Expand Up @@ -15791,6 +15791,12 @@ interface <dfn interface>HTMLLinkElement</dfn> : <span>HTMLElement</span> {
<span data-x="concept-response">response</span> with a 103 status code before serving the final
<span data-x="concept-response">response</span>.<ref spec=RFC8297></p>

<p class="note">For compatibility reasons
<a href="https://www.rfc-editor.org/rfc/rfc8297#section-3">it is recommended</a> to only send
early hints responses over HTTP/2 or later, unless the client is known to handle informational
responses correctly. Despite this, the examples below use HTTP/1.1-style notation as per usual
convention.</p>

<div class="example">
<p>For example, given the following sequence of responses:</p>
<pre>103 Early Hint
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