>From a previous discussion (link below), I note that com.noelios.restlet.util.SecurityUtils compensates for a JDK bug by setting content-type to "application/x-www-form-urlencoded" when the java version is less than 1.5.10.
Unfortunately, the patch number does not apply to Apple's JVM. I'm running 1.5.07, and the compensation results in a bad authenticator. With the source from trunk, if I comment out that bit so it will always be "" when no content-type is sepcified, authentication works fine. Original discussion: http://article.gmane.org/gmane.comp.java.restlet/898 Java system properties: java.runtime.name=Java(TM) 2 Runtime Environment, Standard Edition java.runtime.version=1.5.0_07-164 java.specification.name=Java Platform API Specification java.specification.vendor=Sun Microsystems Inc. java.specification.version=1.5 java.vendor=Apple Computer, Inc. java.vendor.url=http://apple.com/ java.vendor.url.bug=http://developer.apple.com/java/ java.version=1.5.0_07 java.vm.info=mixed mode, sharing java.vm.name=Java HotSpot(TM) Client VM java.vm.specification.name=Java Virtual Machine Specification java.vm.specification.vendor=Sun Microsystems Inc. java.vm.specification.version=1.0 java.vm.vendor="Apple Computer, Inc." java.vm.version=1.5.0_07-87 os.arch=i386 os.name=Mac OS X os.version=10.4.9