[HTTPCLIENT-2077] Migration from HttpClient v4.5.x to v5.0 causes NTLM proxy authentication failure

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 5.0
• Fix Version/s: 5.0.1
• Component/s: HttpClient (classic)
• Assignee: Unassigned
• Reporter: Alexander Kohanov
• Created: 26/Apr/20 00:16
• Updated: 26/Apr/20 15:09
• Resolved: 26/Apr/20 15:09

Description

Upgrade of HttpClient from v4.5.x to v5.0 causes a NTLM proxy authentication failure (s. attached test class NtlmProxyAuthenticationTest.java with generated log file NtlmProxyAuthenticationTest.log).

Error logged: 

01:27:20.360 [main] DEBUG org.apache.hc.client5.http.impl.auth.HttpAuthenticator - Authentication failed
----------------------------------------
407 authenticationrequired
 

 

The same class implemented with HttpClient v4.5.x does not have any proxy issues and connects to the target as expected.