Fix HttpClient 5 migration compilation errors#1087

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Copilot wants to merge 6 commits intomasterfrom

copilot/fix-httpclient-migration-errors

Commits on Feb 6, 2026

Initial plan
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Update HttpClient 4 to 5 - rename classes, update imports, delete custom HTTP methods

Copilot
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rbri
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Fix remaining v5 compatibility issues - SM constants, BasicCommentHandler, imports

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rbri
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Update remaining v4 imports in WebClient, DefaultCredentialsProvider, WebRequest

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rbri
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Update HttpClientTest to use HttpClient 5 imports

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rbri
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Address code review feedback - add null check and security comment

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rbri
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