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nil value for header key 'Foo'
java.lang.IllegalArgumentException: nil value for header key 'Foo'	at aleph.http.core$map__GT_headers_BANG_.invokeStatic(core.clj:136)	at aleph.http.core$map__GT_headers_BANG_.invoke(core.clj:129)	at aleph.http.core$ring_request__GT_netty_request.invokeStatic(core.clj:164)	at aleph.http.core$ring_request__GT_netty_request.invoke(core.clj:155)	at aleph.http.client$http_connection$fn__10528$fn__10529.invoke(client.clj:310)	at manifold.stream.Callback.put(stream.clj:454)	at manifold.stream.graph$async_send.invokeStatic(graph.clj:78)	at manifold.stream.graph$async_send.invoke(graph.clj:74)	at manifold.stream.graph$async_connect$this__5166.invoke(graph.clj:209)	at manifold.stream.graph$async_connect$this__5166$fn__5167$fn__5168.invoke(graph.clj:190)	at clojure.core$trampoline.invokeStatic(core.clj:6064)	at clojure.core$trampoline.invoke(core.clj:6053)	at manifold.stream.graph$async_connect$this__5166$fn__5167.invoke(graph.clj:190)	at manifold.deferred.Listener.onSuccess(deferred.clj:219)	at manifold.deferred.Deferred$fn__4562.invoke(deferred.clj:398)	at manifold.deferred.Deferred.success(deferred.clj:398)	at manifold.deferred$success_BANG_.invokeStatic(deferred.clj:245)	at manifold.deferred$success_BANG_.invoke(deferred.clj:240)	at manifold.stream.default.Stream.put(default.clj:119)	at manifold.stream.default.Stream.put(default.clj:141)	at aleph.http.client$http_connection$fn__10528$fn__10541$fn__10542.invoke(client.clj:334)	at aleph.http.client$http_connection$fn__10528$fn__10541.invoke(client.clj:333)	at aleph.http.client_middleware$wrap_exceptions$fn__10210$fn__10220.invoke(client_middleware.clj:223)	at manifold.deferred$eval4708$chain_SINGLEQUOTE____4729.invoke(deferred.clj:752)	at aleph.http.client_middleware$wrap_exceptions$fn__10210.invoke(client_middleware.clj:223)	at aleph.http.client_middleware$wrap_request_timing$fn__10340.invoke(client_middleware.clj:519)	at aleph.http.client_middleware$wrap_request$fn__10431.invoke(client_middleware.clj:633)	at aleph.http$eval10615$request__10619$fn__10621$fn__10622$fn__10625.invoke(http.clj:233)	at manifold.deferred$eval4708$chain_SINGLEQUOTE____4729.invoke(deferred.clj:770)	at manifold.deferred$eval4708$subscribe__4709$fn__4718.invoke(deferred.clj:724)	at manifold.deferred.Listener.onSuccess(deferred.clj:219)	at manifold.deferred.Deferred$fn__4554$fn__4555.invoke(deferred.clj:396)	at clojure.lang.AFn.run(AFn.java:22)	at io.aleph.dirigiste.Executor$3.run(Executor.java:308)	at io.aleph.dirigiste.Executor$Worker$1.run(Executor.java:62)	at manifold.executor$thread_factory$reify__3957$f__3958.invoke(executor.clj:44)	at clojure.lang.AFn.run(AFn.java:22)	at java.lang.Thread.run(Thread.java:745)