Setting HTTP headers with Jetty - configuration

Question

What's the best way to set HTTP headers (based on filename patterns) in Jetty 6.1? Is it possible via jetty.xml (or jetty-web.xml)? Or do I have to modify web.xml?

Answer 1

You can add headers by configuration. In jetty.xml, put the following example :
<New id="RewriteHandler" class="org.eclipse.jetty.rewrite.handler.RewriteHandler">
<Set name="rules">
<Array type="org.eclipse.jetty.rewrite.handler.Rule">
<Item>
<New id="header" class="org.eclipse.jetty.rewrite.handler.HeaderPatternRule">
<Set name="pattern">*.jsp</Set>
<Set name="name">myheader</Set>
<Set name="value">the value of myheader</Set>
</New>
</Item>
</Array>
</Set>
</New>
<Set name="handler">
<New id="Handlers" class="org.eclipse.jetty.server.handler.HandlerCollection">
<Set name="handlers">
<Array type="org.eclipse.jetty.server.Handler">
<Item>
<Ref id="RewriteHandler"/>
</Item>
</Array>
</Set>
</New>
</Set>
See RewriteHandler api for more examples of what is possible (it was already available in Jetty 6 RewriteHandler)
For information, here is my maven configuration of jetty plugin :
<plugin>
<groupId>org.mortbay.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>8.1.5.v20120716</version>
<configuration>
<jettyXml>${basedir}/src/main/etc/jetty.xml</jettyXml>
</configuration>
<dependencies>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-http</artifactId>
<version>8.1.5.v20120716</version>
<type>jar</type>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-rewrite</artifactId>
<version>8.1.5.v20120716</version>
<type>jar</type>
<scope>runtime</scope>
</dependency>
</dependencies>
</plugin>

Answer 2

The generic answer to my question is of course this:
<web-app>
<filter>
<filter-name>headersFilter</filter-name>
<filter-class>com.example.MyHeadersFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>headersFilter</filter-name>
<url-pattern>*</url-pattern>
</filter-mapping>
...
</web-app>
public class MyHeadersFilter implements Filter {
#Override
public void doFilter(final ServletRequest request, final ServletResponse response, final FilterChain chain)
throws IOException,
ServletException {
final HttpServletRequest httpRequest = (HttpServletRequest) request;
final HttpServletResponse httpResponse = (HttpServletResponse) response;
final String requestUri = httpRequest.getRequestURI();
if (requestUri.matches(...)) {
httpResponse.addHeader(...);
}
chain.doFilter(request, response);
}
}
This should work in any JavaEE web container (and can be made more configurable with <init-param>s).
But isn't there a way to do this purely declaratively in Jetty?

Answer 3

There is a way to adding header in jetty.
using java.lang.instrument and javassist. refer following link for details:
http://hunmr.blogspot.com/2012/12/mock-jetty-behavior-adding-customized.html