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   <title>Managing 1xx Responses</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="architecture.html" title="Chapter&nbsp;30.&nbsp;Architecture"><link rel="prev" href="jetty-classloading.html" title="Jetty Classloading"><link rel="next" href="creating-custom-protocol.html" title="Creating a Custom Protocol"><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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      </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="jetty-1xx-responses"></a>Managing 1xx Responses</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="section"><a href="jetty-1xx-responses.html#jetty-100-continue">100 Continue</a></span></dt><dt><span class="section"><a href="jetty-1xx-responses.html#jetty-102-processing">102 Processing</a></span></dt></dl></div><p>The <a class="link" href="http://www.ietf.org/rfc/rfc2616.txt" target="_top">HTTP RFC</a> allows for 1xx informational responses to be sent before a real content response.
Unfortunately the servlet specification does not provide a way for these to be sent, so Jetty has had to provide non-standard handling of these headers.</p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="jetty-100-continue"></a>100 Continue</h3></div></div></div><p>The 100 Continue response should be sent by the server when a client sends a request with a Expect: 100-continue header, as the client will not send the body of the request until the 100 continue response has been sent.</p><p>The intent of this feature is to allow a server to inspect the headers and to tell the client to not send a request body that might be too large or insufficiently private or otherwise unable to be handled.</p><p>Jetty achieves this by waiting until the input stream or reader is obtained by the filter/servlet, before sending the 100 continues response.
Thus a filter/servlet may inspect the headers of a request before getting the input stream and send an error response (or redirect etc.) rather than the 100 continues.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="jetty-102-processing"></a>102 Processing</h3></div></div></div><p><a class="link" href="http://www.ietf.org/rfc/rfc2518.txt" target="_top">RFC 2518</a> defines the 102 processing response that can be sent "when the server has a reasonable expectation that the request will take significant time to complete.
As guidance, if a method is taking longer than 20 seconds (a reasonable, but arbitrary value) to process the server SHOULD return a 102 (Processing) response".</p><p>So if a request is received with the Expect: 102-processing header, then a filter/servlet may send a 102 response (without terminating further processing) by calling <code class="literal">servletResponse.sendError(102);</code>.</p></div></div><script type="text/javascript">
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