The HTTP adapter lets an "attachment" be set on the HTTP request, and if that attachment is a Java object (which it is) then util.inspect will choke on it, like the following:

Script execution failed: Access to Java class "com.apigee.gateway.services.nodescript.internal.RequestState" is prohibited. (util.js#207): at formatValue (util.js:207) at formatProperty (util.js:380) at util.js:299 at formatValue (util.js:298) at formatProperty (util.js:380) at util.js:299 at formatValue (util.js:298) at formatProperty (util.js:380) at util.js:299 at formatValue (util.js:298) at inspect (util.js:140) at /organization/environment/api/hello-world.js:7 at emit (events.js:98) at adaptorhttp.js:536 at domain.js:183 at domain.js:123 at adaptorhttp.js:535 at adaptorhttp.js:606

A more clever workaround would be to patch util.inspect to output reasonable information on Java objects.