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From Reinhold Früsmer (JIRA) <j...@apache.org>
Subject [jira] [Updated] (HTTPCLIENT-1776) NTLM proxy connection persistence not working anymore
Date Tue, 04 Oct 2016 10:46:20 GMT

     [ https://issues.apache.org/jira/browse/HTTPCLIENT-1776?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Reinhold Früsmer updated HTTPCLIENT-1776:
-----------------------------------------
    Attachment: tomcat-squid-ntlm-not-stateful.pcapng
                tomcat-squid-ntlm-stateful.pcapng

Wireshark logs showing the different behaviour

> NTLM proxy connection persistence not working anymore
> -----------------------------------------------------
>
>                 Key: HTTPCLIENT-1776
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1776
>             Project: HttpComponents HttpClient
>          Issue Type: Bug
>          Components: HttpClient (classic)
>    Affects Versions: 4.5.2
>            Reporter: Reinhold Früsmer
>         Attachments: tomcat-squid-ntlm-not-stateful.pcapng, tomcat-squid-ntlm-stateful.pcapng
>
>
> Hi,
> I'm not sure if this is a problem with HttpClient itself or with Squid (3.3.8) proxy
server, but maybe you could please advise.
> Our client application first sends a HEAD request for NTLM authentication with the proxy
and then re-uses the execution context as described in https://hc.apache.org/httpcomponents-client-ga/tutorial/html/authentication.html
for the following POST requests.
> Using more recent versions of Tomcat on the server-side, re-using the execution context
does not work anymore, the NTLM authentication negotiate-challenge is repeated forever and
following POST requests with chunked transfer-encoding don't work  since they are interrupted
by the authentication challenge.
> I figured out the difference betweeen newer and older Tomcat versions and found the reason:
previously, Tomcat automatically added a "Content-Length: 0" header to the reponse of HEAD
requests. With "Bug 59310 - Content-Length of HEAD requests incorrectly computed as 0" (https://bz.apache.org/bugzilla/show_bug.cgi?id=59310),
this behavior was changed and without this header,  NTLM connections to the proxy don't persist
anymore. 
> As the content-length header is optional in a response to a HEAD request (RFC 7230),
the problem must be either in HttpClient or Squid proxy. 
> Thanks in advance!
> Best regards
> Reinhold 



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