java.lang.IllegalArgumentException: cannot treat nil as HTTP response for request to ''

[uaalto]

This is an issue with the request, but probably Aleph should be able to handle it without an exception. Is that correct?

SEVERE: error in HTTP handler                                                                                                                                                                          
java.lang.IllegalArgumentException: cannot treat nil as HTTP response for request to ''  
 at aleph.http.server$invalid_value_response.invokeStatic(server.clj:132) 
 at aleph.http.server$invalid_value_response.invoke(server.clj:129) 
 at aleph.http.server$handle_request$fn__20360$fn__20361.invoke(server.clj:185) 
 at manifold.deferred$fn__17496$chain_SINGLEQUOTE____17517.invoke(deferred.clj:750) 
 at manifold.deferred$fn__17496$subscribe__17497$fn__17502.invoke(deferred.clj:716) 
 at manifold.deferred.Listener.onSuccess(deferred.clj:219) 
 at manifold.deferred.Deferred$fn__17350.invoke(deferred.clj:396) 
 at manifold.deferred.Deferred.success(deferred.clj:396) 
 at manifold.deferred$success_BANG_.invokeStatic(deferred.clj:243) 
 at manifold.deferred$success_BANG_.invoke(deferred.clj:240) 
 at manifold.deferred$catch_SINGLEQUOTE_$fn__17580.invoke(deferred.clj:959) 
 at manifold.deferred.Listener.onSuccess(deferred.clj:219) 
 at manifold.deferred.Deferred$fn__17350.invoke(deferred.clj:396) 
 at manifold.deferred.Deferred.success(deferred.clj:396) 
 at manifold.deferred$success_BANG_.invokeStatic(deferred.clj:243) 
 at manifold.deferred$success_BANG_.invoke(deferred.clj:240) 
 at manifold.deferred$fn__17496$chain_SINGLEQUOTE____17517.invoke(deferred.clj:737) 
 at manifold.deferred$fn__17496$subscribe__17497$fn__17498.invoke(deferred.clj:710) 
 at manifold.deferred.Listener.onSuccess(deferred.clj:219) 
 at manifold.deferred.Deferred$fn__17350.invoke(deferred.clj:396) 
 at manifold.deferred.Deferred.success(deferred.clj:396) 
 at manifold.deferred$success_BANG_.invokeStatic(deferred.clj:243) 
 at manifold.deferred$success_BANG_.invoke(deferred.clj:240) 
 at aleph.http.server$handle_request$fn__20345$f__16979__auto____20346.invoke(server.clj:153) 
 at clojure.lang.AFn.run(AFn.java:22) 
 at io.aleph.dirigiste.Executor$Worker$1.run(Executor.java:62) 
 at manifold.executor$thread_factory$reify__16871$f__16872.invoke(executor.clj:36) 
 at clojure.lang.AFn.run(AFn.java:22) 
 at java.lang.Thread.run(Thread.java:745) 
Jul 02, 2016 11:22:15 AM aleph.http.server invoke 

[uaalto]

@ztellman what's your opinion on this? Should it be the Aleph user code, or by the library itself?

[ztellman]

Hi, sorry for the delay in responding to this. In your original message, do you mean it's an issue with the response, because I don't understand how it's related to the request.

If you think this is something that Aleph should handle, how do you think it should handle it? An empty 200 response?

[uaalto]

Thanks @ztellman for your reply. Yes, I meant response, sorry. I actually don't know exactly how to reproduce this, I could only gather this log. Is it complaining of a handler resulting in nil? Maybe throw a more informative error so the user can identify the problem better and fix the handler (if that's the case).

[ztellman]

Yes, that's what's happening here. I can make the error message more helpful.

[uaalto]

That would be great! Thank you @ztellman