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view xml/en/docs/stream/ngx_stream_mqtt_preread_module.xml @ 2968:3ba229c95e50
Linux packages: documented lack of HTTP/3 support for older distros.
author | Konstantin Pavlov <thresh@nginx.com> |
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date | Tue, 23 May 2023 14:53:59 -0700 |
parents | a85e4d126bc7 |
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<?xml version="1.0"?> <!-- Copyright (C) Nginx, Inc. --> <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd"> <module name="Module ngx_stream_mqtt_preread_module" link="/en/docs/http/ngx_stream_mqtt_preread_module.html" lang="en" rev="1"> <section id="summary"> <para> The <literal>ngx_stream_mqtt_preread_module</literal> module (1.23.4) allows extracting information from the CONNECT message of the Message Queuing Telemetry Transport protocol (MQTT) versions <link url="https://docs.oasis-open.org/mqtt/mqtt/v3.1.1/mqtt-v3.1.1.html">3.1.1</link> and <link url="https://docs.oasis-open.org/mqtt/mqtt/v5.0/mqtt-v5.0.html">5.0</link>, for example, a username or a client ID. </para> <para> <note> This module is available as part of our <commercial_version>commercial subscription</commercial_version>. </note> </para> </section> <section id="example" name="Example Configuration"> <para> <example> mqtt_preread on; return $mqtt_preread_clientid; </example> </para> </section> <section id="directives" name="Directives"> <directive name="mqtt_preread"> <syntax><literal>on</literal> | <literal>off</literal></syntax> <default>off</default> <context>stream</context> <context>server</context> <para> Enables extracting information from the MQTT CONNECT message at the <link doc="stream_processing.xml" id="preread_phase">preread</link> phase. </para> </directive> </section> <section id="variables" name="Embedded Variables"> <para> <list type="tag"> <tag-name id="var_mqtt_preread_clientid"><var>$mqtt_preread_clientid</var></tag-name> <tag-desc> the <literal>clientid</literal> value from the CONNECT message </tag-desc> <tag-name id="var_mqtt_preread_username"><var>$mqtt_preread_username</var></tag-name> <tag-desc> the <literal>username</literal> value from the CONNECT message </tag-desc> </list> </para> </section> </module>