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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html><head><title>HttpClient - Trace Method</title><style type="text/css" media="all">
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@import url("../style/maven-theme.css");@import url("../style/project.css");</style><link rel="stylesheet" href="../style/print.css" type="text/css" media="print"></link><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"></meta><meta name="author" content="Adrian Sutton"></meta><meta name="email" content="adrian@ephox.com"></meta></head><body class="composite"><div id="banner"><a href="http://jakarta.apache.org/" id="organizationLogo"><img alt="Apache Software Foundation" src="http://jakarta.apache.org/images/jakarta-logo.gif"></img></a><a href="http://jakarta.apache.org/httpcomponents/httpclient-3.x/" id="projectLogo"><img alt="HttpClient" src="../images/httpclient_logo.png"></img></a><div class="clear"><hr></hr></div></div><div id="breadcrumbs"><div class="xleft">Last published: 18 August 2007
<span class="separator">|</span>Doc for 3.1
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<p>The TRACE method is primarily used for debugging and testing purposes,
and simply requests that the server echo back the request it received.
This can be useful for identifying any changes to the request that is
made by proxies.</p>
<p>The TRACE method is used to invoke a remote, application-layer
loop-back of the request message. The final recipient of the request
<i>should</i> reflect the message received back to the client as the
entity-body of a 200 (OK) response. The final recipient is either the
origin server or the first proxy or gateway to receive a max-Forwards
value of zero (0) in the request (see section 14.31 of <a href="http://www.ietf.org/rfc/rfc2616.txt" class="externalLink" title="External Link">RFC2616</a>).</p>
</div><div class="section"><a name="Typical_Usage"></a><h2>Typical Usage</h2>
<p>The trace method simply requires providing a URL and reading the
response received. Additional headers can be added with the
<code>addRequestHeader</code> method as with any other HttpMethod.</p>
<div class="source"><pre>
TraceMethod trace = new TraceMethod("http://jakarata.apache.org");
// Execute the method and handle any errors.
...
// Read the response body.
String request = trace.getResponseBodyAsString();
trace.releaseConnection();
</pre></div>
</div><div class="section"><a name="Common_Problems"></a><h2>Common Problems</h2>
<p>None.</p>
</div><div class="section"><a name="RFC_Section"></a><h2>RFC Section</h2>
<p>The trace method is defined in section 9.6 of <a href="http://www.ietf.org/rfc/rfc2616.txt" class="externalLink" title="External Link">RFC2616</a>.</p>
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