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| </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="1xx-responses"></a>Managing 1xx Responses</h2></div></div></div><div class="toc"><dl><dt><span class="section"><a href="1xx-responses.html#100-continue">100 Continue</a></span></dt><dt><span class="section"><a href="1xx-responses.html#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="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="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="code">servletResponse.sendError(102);</code>. | |
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