Re: a <sameAs:> DNU from : ZnMessage>>isConnectionClose

Hi,
IIUC, the problem is not in 
ZnMultiValueDictionary>>#at: key add: value
"Store value under key. If key already exists, store multiple values as Array"



value maybe an array that is  Correct.


problem is in Here,
ZnMessage >> isConnectionClose

 | value |
 value := self headers at: 'Connection' ifAbsent: [ ^ false ].
"the value maybe a String or an Array "
  " if aString that is OKay,
if an Array  sameAs:   DNU！！"
 ^ value sameAs: 'close'    


So，
ZnMessage >>isConnectionClose
| value |
value := self headers at: 'Connection' ifAbsent: [ ^ false ].
  value isArray ifTrue: [^ value includes: 'close'].
  value isString ifTrue: [^ value sameAs: 'close'].
^false



Same as: 
isConnectionKeepAlive
 | value |
 value := self headers at: 'Connection' ifAbsent: [ ^ false ].
 ^ value sameAs: 'keep-alive'


Liang


At 2018-04-27 20:28:19, "Sven Van Caekenberghe" <[email protected]> wrote:
>Hi,
>
>I would still like to understand how you get in this situation.
>
>You could try the following modification:
>
>ZnMultiValueDictionary>>#at: key add: value
>  "Store value under key. If key already exists, store multiple values as Array"
>	
>  | existingValue newValue |
>  existingValue := self at: key ifAbsent: [ nil ].
>  newValue := existingValue isNil
>    ifTrue: [ value ] 
>    ifFalse: [
>      existingValue isArray 
>        ifTrue: [ 
>          (existingValue includes: value) ifTrue: [ ^ value ].
>          existingValue copyWith: value ]
>        ifFalse: [
>          existingValue = value ifTrue: [ ^ value ].
>          Array with: existingValue with: value ] ].
>  ^ self at: key put: newValue 
>
>This changes one method in a data structure underlying ZnHeaders to prevent it from accepting double entries.
>
>This way, the following expression,
>
>  ZnMultiValueDictionary new at: 'Connection' add: 'close'; at: 'Connection' add: 'close'; yourself.
>
>will result in just one simple association being stored.
>
>Please let me know if this helps.
>
>Sven
>
>> On 27 Apr 2018, at 14:06, lb <[email protected]> wrote:
>> 
>> Hi Sven
>> It came again.
>> Array(Object)>>doesNotUnderstand: #sameAs:
>> ZnRequest(ZnMessage)>>isConnectionClose
>> ZnRequest>>wantsConnectionClose
>> ZnResponse>>setConnectionCloseFor:
>> ZnManagingMultiThreadedServer(ZnMultiThreadedServer)>>augmentResponse:forRequest:
>> ZnManagingMultiThreadedServer(ZnMultiThreadedServer)>>executeOneRequestResponseOn:
>> [ [ self executeOneRequestResponseOn: stream ] whileFalse ] in ZnManagingMultiThreadedServer(ZnMultiThreadedServer)>>executeRequestResponseLoopOn:
>> [ activeProcess psValueAt: index put: anObject.
>> aBlock value ] in ZnCurrentServer(DynamicVariable)>>value:during:
>> BlockClosure>>ensure:
>> ZnCurrentServer(DynamicVariable)>>value:during:
>> ZnCurrentServer class(DynamicVariable class)>>value:during:
>> ZnManagingMultiThreadedServer(ZnMultiThreadedServer)>>executeRequestResponseLoopOn:
>> [ self executeRequestResponseLoopOn: stream ] in [ [ self executeRequestResponseLoopOn: stream ]
>>  ensure: [ self logConnectionClosed: stream.
>>   self closeSocketStream: stream ] ] in [ [ [ self executeRequestResponseLoopOn: stream ]
>>  ensure: [ self logConnectionClosed: stream.
>>   self closeSocketStream: stream ] ]
>>  ifCurtailed: [ socket destroy ] ] in ZnManagingMultiThreadedServer(ZnMultiThreadedServer)>>serveConnectionsOn:
>> BlockClosure>>ensure:
>> [ [ self executeRequestResponseLoopOn: stream ]
>>  ensure: [ self logConnectionClosed: stream.
>>   self closeSocketStream: stream ] ] in [ [ [ self executeRequestResponseLoopOn: stream ]
>>  ensure: [ self logConnectionClosed: stream.
>>   self closeSocketStream: stream ] ]
>>  ifCurtailed: [ socket destroy ] ] in ZnManagingMultiThreadedServer(ZnMultiThreadedServer)>>serveConnectionsOn:
>> BlockClosure>>ifCurtailed:
>> [ [ [ self executeRequestResponseLoopOn: stream ]
>>  ensure: [ self logConnectionClosed: stream.
>>   self closeSocketStream: stream ] ]
>>  ifCurtailed: [ socket destroy ] ] in ZnManagingMultiThreadedServer(ZnMultiThreadedServer)>>serveConnectionsOn:
>> [ self value.
>> Processor terminateActive ] in BlockClosure>>newProcess
>> 
>> 
>> 
>> At 2018-04-12 21:47:24, "lb" <[email protected]> wrote:
>> Hi, Sven,
>> Thank you very much,
>> But I am not familiar with HTTP. I recover to original code now.
>> when that occurs next time, I will copy the error stack here.
>> 
>> 
>> Best regards
>> 
>> Liang
>> 
>> 
>> 
>> At 2018-04-12 20:21:07, "Sven Van Caekenberghe" <[email protected]
>> > wrote:
>> >Hi Liang,
>> >
>> >Headers in HTTP (as represented/implemented by the ZnHeaders object in Pharo) can be multi-valued. That is, a certain header name (key) can occur more than once. That creates a multi-valued situation. For example, there can be multiple cookies being set. But almost always, there is only one header with a unique name.
>> >
>> >What you see must be the result of the 'Connection:close' header line being present twice. I would like to understand how that can happen. Do you have any idea ?
>> >
>> >I am also not sure (I should check) what the spec says.
>> >
>> >What is special here is that although the header line occurs twice, it has the same/identical value.
>> >
>> >In any case, it is the first time I hear about this situation.
>> >
>> >Sven 
>> >
>> >> On 12 Apr 2018, at 11:30, lb <
>> [email protected]
>> > wrote:
>> >> 
>> >> Hi,
>> >> my website always receives a sameAs: DNU from :
>> >> ZnMessage>>isConnectionClose
>> >>  | value |
>> >>  value := self headers at: 'Connection' ifAbsent: [ ^ false ].
>> >>  ^ value sameAs: 'close'
>> >> 
>> >> value is an Array like #('close' 'close').
>> >> 
>> >> I fix like this to avoid receiving DNU message.
>> >> isConnectionClose
>> >>  | value |
>> >>  value := self headers at: 'Connection' ifAbsent: [ ^ false ].
>> >>  value isArray ifTrue: [^ (value at: 1) sameAs: 'close'].
>> >>  value isString ifTrue: [^ value sameAs: 'close'].
>> >>  ^false
>> >> I can not confirm that fix is correct.
>> >> Liang
>> >> _______________________________________________
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