<html>
  <head>
    <title>Configuration Error - Gerrit Code Review</title>
    <style>
      .check_msg {
        background: orange;
        padding: 20px;
        width: 25em;
      }

      .apache_config {
        font-size: small;
        border: 1px dotted black;
        width: 40em;
        margin-left: 5em;
        padding: 1em;
      }

      .apache_auth {
        background: lightgrey;
      }

      #loginHeader {
        font-weight: bold;
        background: lightgrey;
        padding-left: 5px;
        padding-right: 5px;
      }
    </style>
  </head>
  <body>
    <h1>Configuration Error</h1>
    <div class='check_msg'>
      <b>Check the HTTP server's authentication settings.</b>
    </div>

    <p>
      The HTTP server did not provide the username in the
      <span id='loginHeader'>HEADER</span> header when it
      forwarded the request to Gerrit Code Review.
    </p>

    <p>
      If the HTTP server is Apache HTTPd, check the proxy
      configuration includes an authorization directive with
      the proper location, ensuring it ends with '/':
    </p>
    <pre class='apache_config'>
&lt;VirtualHost <span class='ServerName'>review.example.com</span><span class='ServerPort'>:80</span>&gt;
    ServerName <span class='ServerName'>review.example.com</span>

    ProxyRequests Off
    ProxyVia Off
    ProxyPreserveHost On

    &lt;Proxy *&gt;
          Order deny,allow
          Allow from all
    &lt;/Proxy&gt;

<div class='apache_auth'>    &lt;Location <span class='ContextPath'>/r</span>/login/&gt;
      AuthType Basic
      AuthName "Gerrit Code Review"
      Require valid-user
      ...
    &lt;/Location&gt;</div>

    AllowEncodedSlashes On
    ProxyPass <span class='ContextPath'>/r</span>/ http://...<span class='ContextPath'>/r</span>/ nodecode
&lt;/VirtualHost&gt;
    </pre>
  </body>
</html>