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https://issues.apache.org/jira/browse/HTTPCLIENT-1488?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13942987#comment-13942987
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Andreas Sewe commented on HTTPCLIENT-1488:
------------------------------------------
Hi Karl.
The odd thing is that {{ClientProxyAuthentication}} succeeds; no exception is
thrown. Here's the output from {{System.out}}:
{noformat}
executing request: GET / HTTP/1.1
via proxy: http://127.0.0.1:3128
to target: http://www.example.org:80
----------------------------------------
HTTP/1.1 407 Proxy Authentication Required
Response content length: 3215
{noformat}
Apparently, it considers the final 407 the response send from the target. (If
you look at the attached {{builtin.pcap.gz}}, you'll also see that the third
GET doesn't include a {{Proxy-Authorization}} header; apparently, HttpClient in
convinced that no authentication is necessary.
> Built-in NTLM engine fails to authenticate against Squids ntlm_fake_auth,
> JCIFS doesn't
> ---------------------------------------------------------------------------------------
>
> Key: HTTPCLIENT-1488
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1488
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: HttpClient
> Affects Versions: 4.3.3
> Environment: Squid 4.3.3
> JCIFS 1.3.17
> Reporter: Andreas Sewe
> Attachments: builtin.pcap.gz, jcfis.pcap.gz
>
>
> I used the provided ClientProxyAuthentication example
> <https://hc.apache.org/httpcomponents-client-4.2.x/httpclient/examples/org/apache/http/examples/client/ClientProxyAuthentication.java>
> to authenticate with NTML against a local Squid instance, using its
> ntlm_fake_auth helper (only does the handshake, all credentials are
> considered valid).
> Unfortunately, this fails with the NTLM engine built into version 4.3.3 (also
> tested with 4.2.1: same result). Following the guidance of
> <http://hc.apache.org/httpcomponents-client-ga/ntlm.html>, I got it working
> with JCIFS. Is Squid not implementing NTLM as expected by HttpComponents?
> I added two Wireshark captures to show the differences in handshake behaviour
> between the built-in and JCIFS engines. Hope that helps.
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