revert saving protocol

Author: mattzcarey

src/server/index.ts

@@ -442,12 +442,6 @@ export class Server<
 
         const protocolVersion = SUPPORTED_PROTOCOL_VERSIONS.includes(requestedVersion) ? requestedVersion : LATEST_PROTOCOL_VERSION;
 
-        // Inform the transport of the negotiated protocol version.
-        // This allows the transport to validate subsequent request headers.
-        if (this.transport?.setProtocolVersion) {
-            this.transport.setProtocolVersion(protocolVersion);
-        }
-
         return {
             protocolVersion,
             capabilities: this.getCapabilities(),

src/server/streamableHttp.ts

@@ -184,7 +184,6 @@ export class StreamableHTTPServerTransport implements Transport {
     private _allowedOrigins?: string[];
     private _enableDnsRebindingProtection: boolean;
     private _retryInterval?: number;
-    private _protocolVersion?: string;
 
     sessionId?: string;
     onclose?: () => void;
@@ -214,21 +213,6 @@ export class StreamableHTTPServerTransport implements Transport {
         this._started = true;
     }
 
-    /**
-     * Sets the protocol version after negotiation during initialization.
-     * This is called by the Server class after the initialize handshake completes.
-     */
-    setProtocolVersion(version: string): void {
-        this._protocolVersion = version;
-    }
-
-    /**
-     * Gets the negotiated protocol version, if set.
-     */
-    get protocolVersion(): string | undefined {
-        return this._protocolVersion;
-    }
-
     /**
      * Validates request headers for DNS rebinding protection.
      * @returns Error message if validation fails, undefined if validation passes.

src/shared/transport.ts

@@ -122,14 +122,7 @@ export interface Transport {
     sessionId?: string;
 
     /**
-     * Sets the protocol version after negotiation during initialization.
-     * This is called by the Server/Client class after the initialize handshake completes.
+     * Sets the protocol version used for the connection (called when the initialize response is received).
      */
     setProtocolVersion?: (version: string) => void;
-
-    /**
-     * Gets the negotiated protocol version, if set.
-     * Available after initialization completes.
-     */
-    protocolVersion?: string;
 }