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Path Template
Similar to the path handler, however the path template handler allows you to use URI template expressions in the path, for example /rest/{name}. The value of the relevant path template items are stored as an attachment on the exchange, under the io.undertow.server.handlers.PathTemplateHandler#PATH_TEMPLATE_MATCH attachment key.

 /** @deprecated */
    @Deprecated
    public static final AttachmentKey<PathTemplateHandler.PathTemplateMatch> PATH_TEMPLATE_MATCH = AttachmentKey.create(PathTemplateHandler.PathTemplateMatch.class);

 <properties>
        <undertow.version>2.0.15.Final</undertow.version>
  </properties>

    <dependencies>
        <dependency>
            <groupId>io.undertow</groupId>
            <artifactId>undertow-core</artifactId>
            <version>${undertow.version}</version>
        </dependency>
        <dependency>
            <groupId>io.undertow</groupId>
            <artifactId>undertow-servlet</artifactId>
            <version>${undertow.version}</version>
        </dependency>
        <dependency>
            <groupId>io.undertow</groupId>
            <artifactId>undertow-websockets-jsr</artifactId>
            <version>${undertow.version}</version>
        </dependency>
    </dependencies>

    if (exchange.isInIoThread()) {
        exchange.dispatch(this);
        return;
    }

    if (exchange.isInIoThread()) {
        exchange.dispatch(new ErrorHandler(this));
        return;
    }