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<title>Nine Nines: Migrating from Gun 2.1 to 2.2</title>
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<h1 class="lined-header"><span>Migrating from Gun 2.1 to 2.2</span></h1>
<p>Gun 2.2 contains many features and fixes, including an experimental HTTP/3 implementation.</p>
<p>Gun 2.2 requires Erlang/OTP 24.0 or greater.</p>
<h2 id="_features_added">Features added</h2>
<ul><li>Gun will now do wildcard certificate matching by default, as required by the HTTP protocol, by setting the <code>customize_hostname_check</code> ssl option.
</li>
<li>User pings are now supported for HTTP/2. User pings are PING frames sent by the user, with the corresponding PING_ACK resulting in a <code>gun_notify</code> message being sent to the user process. They can be used to measure latency or do other checks.
</li>
<li>The <code>reply_to</code> request option has been extended to accept a fun or an MFA that will be called when a reply must be sent to the user process.
</li>
<li>The <code>state_name</code>, <code>event_handler</code> and <code>event_handler_state</code> fields were added to <code>gun:info/1</code>.
</li>
<li>Update Cowlib to 2.15.0.
</li>
</ul>
<h2 id="_experimental_features_added">Experimental features added</h2>
<ul><li>Experimental support for HTTP/3 has been added. Websocket over HTTP/3 is not currently implemented. HTTP/3 support is disabled by default; to enable, the environment variable GUN_QUICER must be set at compile-time.
</li>
</ul>
<h2 id="_bugs_fixed">Bugs fixed</h2>
<ul><li>TLS 1.3 performs certificate validation independently from the handshake, which means that certificate errors can arrive after the handshake has completed. This is in part to support post-handshake authentication. Gun will now replace <code>{error, closed}</code> and similar socket errors with the TLS alert when possible, including for TLS over TLS and TLS over HTTP/2 scenarios.
</li>
<li>HTTP/2 tunneling has been improved: WINDOW_UPDATE frames are now properly sent, and flow control is handled. In addition closing the stream is better handled. This impacts both proxying scenarios as well as Websocket over HTTP/2.
</li>
<li>HTTP/2 will now properly send a NO_ERROR "error" code when initiating graceful shutdown.
</li>
<li>HTTP/2 will now properly track the number of streams currently running and immediately fail when the user tries to open a stream too many compared to what the server allows.
</li>
<li>Sometimes stray HTTP/2 timeout messages could be received, producing a log message. This was because they were not cleaned up on disconnect. Now they are.
</li>
<li>Socket errors were not properly handled when sending Websocket PONG frames. This has been corrected.
</li>
<li>Trying to send a Websocket frame over an HTTP connection (before the Websocket upgrade) will now result in an error sent to the user process.
</li>
<li>When connecting to HTTP via a Unix domain socket, Gun will now set the host header to "localhost" by default. Previously an invalid host header was sent.
</li>
<li>Data could be lost when switching to the raw protocol. This has been corrected.
</li>
<li>Documentation has been updated to describe the <code>notify_settings_changed</code> option; as well as to recommend disabling automatic reconnect when Websocket is used; and to provide context around potential security risks due to HTTP/2 compressed headers.
</li>
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<a style="float:left" href="https://ninenines.eu/docs/en/gun/2.2/guide/internals_tls_over_tls/">
Internals: TLS over TLS
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<a style="float:right" href="https://ninenines.eu/docs/en/gun/2.2/guide/migrating_from_2.0/">
Migrating from Gun 2.0 to 2.1
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<h3>
Gun
2.2
User Guide
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<h4>Version select</h4>
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<li><a href="/docs/en/gun/2.2/guide">2.2</a></li>
<li><a href="/docs/en/gun/2.1/guide">2.1</a></li>
<li><a href="/docs/en/gun/2.0/guide">2.0</a></li>
<li><a href="/docs/en/gun/1.3/guide">1.3</a></li>
<li><a href="/docs/en/gun/1.2/guide">1.2</a></li>
<li><a href="/docs/en/gun/1.1/guide">1.1</a></li>
<li><a href="/docs/en/gun/1.0/guide">1.0</a></li>
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