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      <h1>Shiny Server (Pro) 1.5.4</h1>
      <p><small>Originally published on the RStudio blog on September 12, 2017. <a href="https://posit.co/blog/shiny-server-pro-1-5-4/">Read it at Posit</a>.</small></p>

      <p><a href="https://posit.co/products/open-source/shiny-server/">Shiny Server 1.5.4.869 and Shiny Server Pro 1.5.4.872 are now available.</a></p>

      <p>Both the new Shiny Server and Shiny Server Pro releases include bug fixes and enhancements, and we recommend upgrading at your earliest convenience.</p>

      <h2>Shiny Server 1.5.4.869</h2>

      <ul>
        <li><a href="https://docs.posit.co/shiny-server/#clickjacking-protection">Clickjacking protection</a> can now be enabled using the <code>frame_options</code> directive. This directive was already available in Shiny Server Pro, but is now available in Shiny Server as well.</li>
        <li>A bug that caused <code>"Error: Can't set headers after they are sent."</code> to appear in error logs was fixed.</li>
        <li>Several bugs in <code>license-manager</code> were fixed.</li>
      </ul>

      <h2>Shiny Server Pro 1.5.4.872</h2>

      <ul>
        <li>The “utilization scheduler” component, which manages the way requests are routed to R processes, has been significantly improved. It has been made more robust, and applications now respond more efficiently to increased load.</li>
        <li><code>auth_pam</code>: The performance of multiple simultaneous logins was improved.</li>
        <li><code>auth_ldap</code>: A bug was fixed that caused LDAP to return no groups when a username contained a backslash.</li>
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