refactor: align protocol version header capitalization to lowercase#911
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Standardize the MCP protocol version header name to lowercase "mcp-protocol-version" across the entire codebase for consistency. This change affects: - Client auth module - Client streamable HTTP transport - Server auth routes - Server streamable HTTP transport - Test files The lowercase format aligns with common HTTP header conventions and ensures consistent header handling throughout the SDK.
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Summary
This PR standardizes the MCP protocol version header name to lowercase
mcp-protocol-versionacross the entire Python SDK codebase for consistency.Changes
Changed
MCP-Protocol-Versiontomcp-protocol-versionthroughout and aligned usage of constantsRationale
The lowercase format aligns with common HTTP header conventions (similar to headers like
content-type,accept-encoding, etc.) and ensures consistent header handling throughout the SDK.Test plan