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Merge pull request #392 from koic/fallback_missing_protocol_version_in_streamable_http_transport

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Default missing `MCP-Protocol-Version` to 2025-03-26 in StreamableHTTPTransport
This commit is contained in:
Koichi ITO 2026-06-14 00:15:55 +09:00 • committed by GitHub
commit 3d7046ab1a
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2 changed files with 46 additions and 2 deletions
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1
lib/mcp/configuration.rb
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@ -6,6 +6,7 @@ module MCP
SUPPORTED_STABLE_PROTOCOL_VERSIONS = [
LATEST_STABLE_PROTOCOL_VERSION, "2025-06-18", "2025-03-26", "2024-11-05",
]
DEFAULT_NEGOTIATED_PROTOCOL_VERSION = "2025-03-26"
attr_writer :exception_reporter, :around_request

3
lib/mcp/server/transports/streamable_http_transport.rb
View file

@ -551,8 +551,7 @@ module MCP
end
def validate_protocol_version_header(request)
header_value = request.env["HTTP_MCP_PROTOCOL_VERSION"]
return if header_value.nil?
header_value = request.env["HTTP_MCP_PROTOCOL_VERSION"] || MCP::Configuration::DEFAULT_NEGOTIATED_PROTOCOL_VERSION
return if MCP::Configuration::SUPPORTED_STABLE_PROTOCOL_VERSIONS.include?(header_value)
supported = MCP::Configuration::SUPPORTED_STABLE_PROTOCOL_VERSIONS.join(", ")