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Whilst running a Gatling test on a server that does not generate any headers at all I get the following exception:
java.lang.IllegalStateException: Response's headers hasn't been computed by your AsyncHandler.
at com.ning.http.client.providers.netty.NettyResponse.getCookies(NettyResponse.java:184)
at com.excilys.ebi.gatling.http.response.ExtendedResponse.getCookies(ExtendedResponse.scala:89)
at com.excilys.ebi.gatling.http.ahc.GatlingAsyncHandlerActor.com$excilys$ebi$gatling$http$ahc$GatlingAsyncHandlerActor$$processResponse(GatlingAsyncHandlerActor.scala:198)
at com.excilys.ebi.gatling.http.ahc.GatlingAsyncHandlerActor$$anonfun$receive$1.apply(GatlingAsyncHandlerActor.scala:107)
at com.excilys.ebi.gatling.http.ahc.GatlingAsyncHandlerActor$$anonfun$receive$1.apply(GatlingAsyncHandlerActor.scala:83)
at akka.actor.Actor$class.apply(Actor.scala:318)
at com.excilys.ebi.gatling.core.action.BaseActor.apply(BaseActor.scala:23)
at akka.actor.ActorCell.invoke(ActorCell.scala:626)
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:197)
at akka.dispatch.Mailbox.run(Mailbox.scala:179)
at akka.dispatch.ForkJoinExecutorConfigurator$MailboxExecutionTask.exec(AbstractDispatcher.scala:516)
at akka.jsr166y.ForkJoinTask.doExec(ForkJoinTask.java:259)
at akka.jsr166y.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:975)
at akka.jsr166y.ForkJoinPool.runWorker(ForkJoinPool.java:1479)
at akka.jsr166y.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:104)
The problem is that the headers in the response are null which causes the exception to be thrown.
However, the HTTP Response RFC states that the headers are optional and that only the status line and a single CRLF are required.
The RFC is at http://www.w3.org/Protocols/rfc2616/rfc2616-sec6.html
with the relevant Augmented BNF being:
Response = Status-Line
*(( general-header
response-header
entity-header ) CRLF)
CRLF
[ message-body ]
where the *((...)) indicates that 0 or more of the elements after the * are permitted.
Therefore it is not in keeping with the standard to throw an exception if there are no headers, simply to use empty headers if there are none.
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