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Set Mcp-Protocol-Version in client requests after init, and warn when it doesn't match negotiated version (it SHOULD match)

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Olivier Chafik 2025-06-10 14:07:10 +01:00
commit 84971c83ea
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1 changed files with 243 additions and 19 deletions
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6
src/client/streamableHttp.ts
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@ -124,6 +124,7 @@ export class StreamableHTTPClientTransport implements Transport {
private _authProvider?: OAuthClientProvider;
private _sessionId?: string;
private _reconnectionOptions: StreamableHTTPReconnectionOptions;
protocolVersion?: string;
onclose?: () => void;
onerror?: (error: Error) => void;
@ -162,7 +163,7 @@ export class StreamableHTTPClientTransport implements Transport {
}
private async _commonHeaders(): Promise<Headers> {
const headers: HeadersInit = {};
const headers: HeadersInit & Record<string, string> = {};
if (this._authProvider) {
const tokens = await this._authProvider.tokens();
if (tokens) {
@ -173,6 +174,9 @@ export class StreamableHTTPClientTransport implements Transport {
if (this._sessionId) {
headers["mcp-session-id"] = this._sessionId;
}
if (this.protocolVersion != null) {
headers["mcp-protocol-version"] = this.protocolVersion;
}
return new Headers(
{ ...headers, ...this._requestInit?.headers }