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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)