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<title>Nine Nines: Migrating from Gun 1.2 to 1.3</title>
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<h1 class="lined-header"><span>Migrating from Gun 1.2 to 1.3</span></h1>
<p>Gun 1.3 improves the support for CONNECT requests introduced in the previous version and documents Websocket protocol negotiation.</p>
<h2 id="_features_added">Features added</h2>
<ul><li>The <code>protocols</code> CONNECT destination option has been added as a replacement for the now deprecated <code>protocol</code> option.
</li>
<li>Add built-in support for Websocket protocol negotiation through the Websocket option <code>protocols</code>. The interface of the handler module currently remains undocumented and must be set to <code>gun_ws_h</code>.
</li>
<li>Add the h2specd HTTP/2 test suite from the h2spec project.
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</ul>
<h2 id="_bugs_fixed">Bugs fixed</h2>
<ul><li>Fix connecting to HTTP/2 over TLS origin servers via HTTP/1.1 CONNECT proxies.
</li>
<li>Do not send the HTTP/1.1 keepalive while waiting for a response to a CONNECT request.
</li>
<li>Do not crash on HTTP/2 HEADERS frames with the PRIORITY flag set.
</li>
<li>Do not crash on HTTP/2 HEADERS frames when the END_HEADERS flag is not set.
</li>
<li>Do not crash on unknown HTTP/2 frame types.
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<li>Reject HTTP/2 WINDOW_UPDATE frames when they would cause the window to overflow.
</li>
<li>Send a GOAWAY frame on closing the HTTP/2 connection.
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Migrating from Gun 1.1 to 1.2
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Gun
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