Actions: modelcontextprotocol/python-sdk
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Origin header → rejected with 403 by spec-compliant servers (e.g. go-sdk CrossOriginProtection)
Claude Code
#2640:
Issue comment #2727 (comment)
created
by
tarunag10
TransportSecuritySettings.allowed_hosts=[] (default) silently rejects external Host headers with HTTP 421
Claude Code
#2638:
Issue comment #2688 (comment)
created
by
Asti1982
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