I use GWT and GAE for my deployment environment and sometimes I get
this exception (for some of my users):

javax.servlet.ServletContext log: Exception while dispatching incoming
RPC call
java.lang.SecurityException: Blocked request without GWT permutation
header (XSRF attack?)
        at
com.google.gwt.user.server.rpc.RemoteServiceServlet.checkPermutationStrongName(RemoteServiceServlet.java:
267)
        at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:
202)
        at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:
243)
.............

Is this a problem from the GWT compiler ?

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