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POHow to construct message header for a HEAD response with restlet
 

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  1. POHow to construct message header for a HEAD response with restlet
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    <p>I'm trying to create a HEAD response with restlet. Unfortunatly there is ony a <code>@Get</code> annotation, but the restlet author <a href="http://markmail.org/message/65xfouswij67teh5" rel="nofollow">states</a>, that you have to use a <code>@Get</code>, and then compare the Method. As the <a href="http://www.restlet.org/documentation/2.0/jse/api/org/restlet/data/Method.html#HEAD" rel="nofollow">documentation/specification</a> says, there can be no body, but only a message header.</p> <p>Now how to create a message header that will be send to the server, because the following code does not work, it sends this headers: HTTP/1.1 204 No Content, Content-Length: 0</p> <pre><code>protected void addResponseHeader(String name, String value) { Form responseHeaders = (Form)getResponse().getAttributes().get(HeaderConstants.ATTRIBUTE_HEADERS); if (responseHeaders == null) { responseHeaders = new Form(); getResponse().getAttributes().put(HeaderConstants.ATTRIBUTE_HEADERS, responseHeaders); } responseHeaders.add(new Parameter(name, value)); } </code></pre> <p>The concrete code on server-side:</p> <pre><code>@Get public void execute() { if (Method.HEAD.equals(getMethod())) { //optional: getResponse().getEntity().setMediaType(MediaType.TEXT_PLAIN); getResponse().setStatus(Status.SUCCESS_OK, "hello head"); addResponseHeader("X-my-header", "value"); } } </code></pre> <p>The client code:</p> <pre><code>@Test public void head() { Request request = new Request(Method.HEAD, url); Response response = query(request); assertEquals(Status.SUCCESS_OK, response.getStatus()); Form form = (Form)response.getAttributes().get(HeaderConstants.ATTRIBUTE_HEADERS); assertEquals("value", form.getFirstValue("X-my-value")); // does fail because it is null } </code></pre>
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