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Added clarifications to service.html.
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<body>
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<h1>Web-based checking with vnu.war or vnu.jar</h1>
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<p>Along with <a href="./">command-line use</a>,
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the <code>vnu.jar</code> package is suited to use
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as a simple <a href="#web-based-usage">standalone HTTP server.</a>
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If you want to deploy the application to a servlet container
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such as Apache Tomcat you will probably want to use the
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<code>vnu.war</code> package instead.
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<p>The Nu Markup Checker— along with being usable as
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<a href="http://validator.github.io/#usage">a standalone command-line client</a>—
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can be run as an HTTP service, similar to
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<a href="http://html5.validator.nu/">http://html5.validator.nu/</a>
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and
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<a href="http://validator.w3.org/nu/">http://validator.w3.org/nu/</a>,
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for browser-based checking of HTML documents over
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the Web.
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To that end, the checker is released as two separate packages:
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<ul>
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<li><code>vnu.jar</code> for
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<a href="#standalone">deploying the checker as a simple standalone service</a>
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<li><code>vnu.war</code> for
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<a href="#servlet">deploying the checker to a servlet container such as Tomcat</a>
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</ul>
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<p>
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Both deployments expose a REST API that enables checking of HTML
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documents from other clients, not just web browsers. And the
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<code>vnu.jar</code> package also includes
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<a href="#http-client">a simple HTTP client</a> that enables you to
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either send documents to a locally-running instance of the checker HTTP
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service— for fast command-line checking— or to any remote instance of the
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checker HTTP service running anywhere on the Web.
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<p>
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The
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<a href="https://github.com/validator/validator.github.io/releases/latest" >latest releases of these files</a>
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<a href="https://github.com/validator/validator.github.io/releases/latest" >latest releases of the vnu.jar and vnu.war packages</a>
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are available from the <code>validator</code> project at github.
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The following are instructions demonstrating how to use these two
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packages to provide a service for browser-based checking of
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HTML documents over the web.
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The following are detailed instructions on using them.
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<p class=note><b>Note:</b> Replace
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<var>"~/vnu.jar"</var> or <var>"~/vnu.war"</var> below
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<a href="#http-client-options">Options</a>
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<div class=set>
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<section id=web-based-usage>
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<h2>Web-based usage</h2>
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<p>You can use <code>vnu.jar</code> or <code>vnu.war</code> to provide a service for
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browser-based checking of HTML documents over the web, similar to
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<a href="http://html5.validator.nu/">http://html5.validator.nu/</a>
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and
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<a href="http://validator.w3.org/nu/">http://validator.w3.org/nu/</a>.
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The service also includes a REST API for providing checking of HTML
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documents for other clients, not just web browsers.
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</section>
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<section id=standalone>
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<h2>Standalone web server</h2>
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<p>To run the markup checker as a standalone service
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(using a built-in Jetty server),
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open a new terminal window
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and invoke <code>vnu.jar</code> like this:
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<p>To run the markup checker as a standalone service (using a built-in
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Jetty server), open a new terminal window and invoke <code>vnu.jar</code>
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like this:
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<pre>
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java -cp ~/vnu.jar <span class=java-class>nu.validator.servlet.Main</span> <span class=arg>8888</span>
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<section id=http-client>
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<h2>HTTP client (for fast command-line checking)</h2>
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<p>You can also use <code>vnu.jar</code> from the command line to send
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HTML documents to a locally-running instance of the HTTP service for
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checking. To check documents in that way, do this:
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<p>You can also use <code>vnu.jar</code> from the command line to
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either send documents to a locally-running instance of the checker HTTP
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service— for fast command-line checking— or to a remote instance
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anywhere on the Web.
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<p>
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To check documents locally, do this:
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<ol>
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<li>Open a new terminal window and start up the markup checker as an HTTP
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service, as described in the
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"<a href="#web-based-usage">Web-based usage</a>" section.
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<li>Open a second new terminal window and invoke <code>vnu.jar</code>
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like this:
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<li>Start up the checker as a local HTTP service, as described in the
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<a href="#standalone">Standalone web server</a>
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section.
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<li>Open a new terminal window and invoke <code>vnu.jar</code> like this:
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<pre>
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java -cp ~/vnu.jar <span class=java-class>nu.validator.client.HttpClient</span> FILE.html...
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</pre>
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</ol>
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</ol>
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To send documents to an instance of the checker on the Web, such as
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<a href="http://html5.validator.nu/">http://html5.validator.nu/</a>,
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use the
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<a href="#nuvalidatorclienthost">nu.validator.client.host</a>
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and
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<a href="#nuvalidatorclientport">nu.validator.client.port</a>
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options, like this:
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<pre class=aligned>
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java <span class=java-property>-Dnu.validator.client.host=html5.validator.nu</span> <span class=java-property>-Dnu.validator.client.port=80</span> \
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-cp ~/vnu.jar nu.validator.client.HttpClient FILE.html...
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</pre>
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<p>Other options are documented below.
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<h3 id="http-client-options">HTTP client options</h3>
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<p>When using <code>vnu.jar</code> for sending documents to a
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locally-running instance of the checker HTTP service for checking,
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you can set Java system properties to control configuration options for the
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checker behavior.
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<p>When using <code>vnu.jar</code> for sending documents to an instance
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of the checker HTTP service for checking, you can set Java system
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properties to control configuration options for the checker behavior.
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<p>For example, you can suppress warning-level messages and only
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show error-level ones by setting the value of the
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<code>nu.validator.client.level</code> system property to
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<code>error</code>, like this:
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<pre>
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<pre class=aligned>
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java <span class=java-property>-Dnu.validator.client.level=error</span>\
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-cp ~/vnu.jar <span class=java-class>nu.validator.client.HttpClient</span> FILE.html...
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-cp ~/vnu.jar nu.validator.client.HttpClient FILE.html...
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</pre>
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<p>Most of the properties listed below map to the validator.nu common input

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