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https://issues.apache.org/jira/browse/HTTPCLIENT-1715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15118041#comment-15118041
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Gary Gregory commented on HTTPCLIENT-1715:
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[[email protected]]: Do you think we should find a way to make
{{NTLMMessage}} thread-safe? Or is my proposal good enough?
> NTLMEngineImpl.Type1Message not thread safe but declared as a constant
> ----------------------------------------------------------------------
>
> Key: HTTPCLIENT-1715
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1715
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: HttpClient
> Affects Versions: 4.5.1
> Reporter: Olivier Lafontaine
>
> {{NTLMEngineImpl}} declares a {{static final}} member named
> {{TYPE_1_MESSAGE}} of type {{Type1Message}}. Members of {{Type1Message}} are
> final and do not change, but that is not the case for members of its
> superclass {{NTLMMessage}}.
> Whenever the method {{NTLMEngineImpl#getType1Message(String, String)}} is
> called, the method {{NTLMMessage#getResponse()}} get called on the
> {{TYPE_1_MESSAGE}} instance and this modifies the following members of
> {{NTLMMessage}}:
> * messageContents
> * currentOutputPosition
> This is not thread safe and we get exceptions as seen in HTTPCLIENT-1686.
> My guess is that the computed response string should be kept in a constant
> instead of a {{Type1Message}} instance.
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