typescript-sdk/.changeset/standard-header-ows.md

@modelcontextprotocol/server	@modelcontextprotocol/core-internal
patch	patch

Strip RFC 9110 optional whitespace around inbound MCP-Protocol-Version, Mcp-Method, and Mcp-Name values before classifying and validating modern HTTP requests. This keeps valid requests portable across Fetch runtimes that expose raw leading or trailing SP/HTAB through Headers.get().