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feat: HTTP Header Standardization for method and name (#907)

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## Description

Implements SEP-2243
(https://modelcontextprotocol.io/seps/2243-http-standardization) (HTTP
Header Standardization) for Mcp-Method and Mcp-Name standard headers
(x-mcp-param custom headers will be covvered in separate PR).

Fixes #905
This commit is contained in:
Guglielmo Colombo 2026-04-29 17:33:39 +02:00 • committed by GitHub
commit e01639a318
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1 changed files with 798 additions and 10 deletions
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4
mcp/shared.go
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@ -36,6 +36,7 @@ const (
// It is the version that the client sends in the initialization request, and
// the default version used by the server.
latestProtocolVersion = protocolVersion20251125
protocolVersion20260630 = "2026-06-30"
protocolVersion20251125 = "2025-11-25"
protocolVersion20250618 = "2025-06-18"
protocolVersion20250326 = "2025-03-26"
@ -343,6 +344,9 @@ func clientSessionMethod[P Params, R Result](f func(*ClientSession, context.Cont
// MCP-specific error codes.
const (
// CodeHeaderMismatch indicates that HTTP headers do not match the corresponding values
// in the request body, or that required headers are missing or malformed.
CodeHeaderMismatch = -32001
// CodeResourceNotFound indicates that a requested resource could not be found.
CodeResourceNotFound = -32002
// CodeURLElicitationRequired indicates that the server requires URL elicitation