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   <title>Authentication Support</title><link rel="stylesheet" type="text/css" href="css/docbook.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><meta name="keywords" content="jetty, servlet, servlet-api, cometd, http, websocket, eclipse, maven, java, server, software"><link rel="home" href="index.html" title="Jetty"><link rel="up" href="http-client.html" title="Chapter&nbsp;22.&nbsp;HTTP Client"><link rel="prev" href="http-client-cookie.html" title="Cookies Support"><link rel="next" href="http-client-proxy.html" title="Proxy Support"><link xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times" rel="shortcut icon" href="images/favicon.ico"><link rel="stylesheet" href="css/highlighter/foundation.css"><script src="js/highlight.pack.js"></script><script>
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            Version: 9.3.28.v20191105</span></td><td style="width: 50%"></td></tr></table><div xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Authentication Support</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="http-client-cookie.html"><i class="fa fa-chevron-left" aria-hidden="true"></i> Previous</a>&nbsp;</td><th width="60%" align="center">Chapter&nbsp;22.&nbsp;HTTP Client<br><a accesskey="p" href="index.html"><i class="fa fa-home" aria-hidden="true"></i> Home</a></th><td width="20%" align="right">&nbsp;<a accesskey="n" href="http-client-proxy.html">Next <i class="fa fa-chevron-right" aria-hidden="true"></i></a></td></tr></table><hr></div><div xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times" class="jetty-callout"><h5 class="callout"><a href="http://www.webtide.com/">Contact the core Jetty developers at
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      </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="http-client-authentication"></a>Authentication Support</h2></div></div></div><p>Jetty&#8217;s HTTP client supports the "Basic" and "Digest" authentication mechanisms defined by <a class="link" href="https://tools.ietf.org/html/rfc7235" target="_top">RFC 7235</a>.</p><p>You can configure authentication credentials in the HTTP client instance as follows:</p><pre xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times"><code>URI uri = new URI("http://domain.com/secure");
String realm = "MyRealm";
String user = "username";
String pass = "password";

// Add authentication credentials
AuthenticationStore auth = httpClient.getAuthenticationStore();
auth.addAuthentication(new BasicAuthentication(uri, realm, user, pass));

ContentResponse response = httpClient
        .newRequest(uri)
        .send()
        .get(5, TimeUnit.SECONDS);</code></pre><p>Jetty&#8217;s HTTP client tests authentication credentials against the challenge(s) the server issues, and if they match it automatically sends the right authentication headers to the server for authentication.
If the authentication is successful, it caches the result and reuses it for subsequent requests for the same domain and matching URIs.</p><p>The HTTP conversation for a successful match is the following:</p><pre class="screen">Application  HttpClient                     Server
     |           |                             |
     |--- GET ---|------------ GET -----------&gt;|
     |           |                             |
     |           |&lt;-- 401 + WWW-Authenticate --|
     |           |                             |
     |           |--- GET + Authentication ---&gt;|
     |           |                             |
     |&lt;-- 200 ---|------------ 200 ------------|</pre><p>The application does not receive events related to the response with code 401, they are handled internally by <code class="literal">HttpClient</code> which produces a request similar to the original but with the correct <code class="literal">Authorization</code> header, and then relays the response with code 200 to the application.</p><p>Successful authentications are cached, but it is possible to clear them in order to force authentication again:</p><pre xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times"><code>httpClient.getAuthenticationStore().clearAuthenticationResults();</code></pre><p>Authentications may be preempted to avoid the additional roundtrip due to the server challenge in this way:</p><pre xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times"><code>AuthenticationStore auth = httpClient.getAuthenticationStore();
URI uri = URI.create("http://domain.com/secure");
auth.addAuthenticationResult(new BasicAuthentication.BasicResult(uri, "username", "password"));</code></pre><p>In this way, the original request is enriched by <code class="literal">HttpClient</code> immediately with the <code class="literal">Authorization</code> header, and the server should respond with a 200 and the resource content rather than with the 401 and the challenge.</p><p>See also the <a class="link" href="http-client-proxy.html#http-client-proxy-authentication" title="Proxy Authentication Support">proxy authentication section</a> for further information about how authentication works with HTTP proxies.</p></div><script type="text/javascript">
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