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This release adds an MCPGODEBUG flag to opt out of the Content-Type check on POST requests.

Behavior Changes

Prior to v1.6.0 (v1.4.0...v1.5.0), the Content-Type check on POST requests was gated by the same disablecrossoriginprotection MCPGODEBUG flag as the cross-origin protection. In v1.6.0, the cross-origin protection was disabled by default (replaced by the opt-in enableoriginverification flag), but the Content-Type check was kept on unconditionally, leaving no way to disable it. This release restores an escape hatch for both the Streamable HTTP and SSE transports: setting MCPGODEBUG=disablecontenttypecheck=1 skips the Content-Type: application/json validation on POST requests. See #957.

What's Changed

mcp: add MCPGPDEBUG for opt-in Content-Type check by @guglielmo-san in https://github.com/modelcontextprotocol/go-sdk/pull/972

Full Changelog: https://github.com/modelcontextprotocol/go-sdk/compare/v1.6.0...v1.6.1

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