Migrate Apache HttpClient 4.5.14 → 5.4.3 with HTTP/2 support#1086

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Copilot wants to merge 8 commits intomasterfrom

copilot/migrate-httpclient-4-5-14-to-5-4-x

Commits on Feb 6, 2026

Initial plan
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Phase 1: Update dependencies and basic HTTP classes to HttpClient 5.4.1

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Phase 2: Update cookie handler classes to HttpClient 5.4.1 APIs

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Phase 3: Update cookie support classes and credentials to HttpClient 5.4.1

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Phase 4: Update HtmlUnitBrowserCompatCookieSpec to HttpClient 5.4.1

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Phase 5: Complete SSL/TLS support - update HtmlUnitSSLConnectionSocketFactory and SocksConnectionSocketFactory

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Phase 6: Update WebRequest, WebClient, and DefaultCredentialsProvider imports

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Security: Update httpclient5 to 5.4.3 to fix domain check vulnerability

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