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(helpers — scenarios are owned by New HTTP serving path (modern + dual-era) server-side and New Client (all-versions, low-level + high-level) client-side)
Tracks: #2715
The shared encode/decode and
x-mcp-headerrule helpers used by both sides; server-side validation of inbound headers vs body.What's in it
Mcp-Method/Mcp-Name/Mcp-Param-*(base64-sentinel, thex-mcp-headerconstraint rules).Conformance
http-header-validation,http-custom-header-server-validationhttp-custom-headers,http-invalid-tool-headers,http-standard-headersDependencies
References