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Title: SEP-2243 HTTP Standardization by mikekistler · Pull Request #2243 · modelcontextprotocol/modelcontextprotocol · GitHub

Open Graph Title: SEP-2243 HTTP Standardization by mikekistler · Pull Request #2243 · modelcontextprotocol/modelcontextprotocol

X Title: SEP-2243 HTTP Standardization by mikekistler · Pull Request #2243 · modelcontextprotocol/modelcontextprotocol

Description: Specification and documentation for the Model Context Protocol - SEP-2243 HTTP Standardization by mikekistler · Pull Request #2243 · modelcontextprotocol/modelcontextprotocol

Open Graph Description: Motivation and Context This PR introduces a SEP for incorporating HTTP features into the HTTP Transport that support processing by "middle boxes" on the internet, for tasks like routing, ...

X Description: Motivation and Context This PR introduces a SEP for incorporating HTTP features into the HTTP Transport that support processing by "middle boxes" on the internet, for tasks like r...

Opengraph URL: https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2243

X: @github

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Domain: github.com

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2026-07-28 Spec Compliance modelcontextprotocol/csharp-sdk#1539 https://github.com/modelcontextprotocol/csharp-sdk/issues/1539
SEP-2243: HTTP Standardization modelcontextprotocol/csharp-sdk#1541 https://github.com/modelcontextprotocol/csharp-sdk/issues/1541
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May 24, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2243#ref-pullrequest-4513336060
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[2026-07-28] Transport & observability headers/metadata modelcontextprotocol/php-sdk#336 https://github.com/modelcontextprotocol/php-sdk/issues/336
[Server][Client][Transport] SEP-2243: Emit Mcp-Method and Mcp-Name HTTP headers modelcontextprotocol/php-sdk#353 https://github.com/modelcontextprotocol/php-sdk/issues/353
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May 27, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2243#ref-issue-4535810208
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May 29, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2243#ref-issue-4547537516
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Jun 2, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2243#ref-issue-4573024949
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New HTTP serving path (modern + dual-era) modelcontextprotocol/python-sdk#2893 https://github.com/modelcontextprotocol/python-sdk/issues/2893
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