fix: Add Accept Header in StreamableHTTP Client

[hhxiao]

Per Spec , The client MUST include an Accept header, listing both application/json and text/event-stream as supported content types.

Summary by CodeRabbit

• Bug Fixes
  • Ensured HTTP notifications now include the correct "Accept" header for improved compatibility with servers expecting "application/json, text/event-stream".

[coderabbitai]

Walkthrough

The update modifies the SendNotification method within the StreamableHTTP type to include an "Accept" header with the value "application/json, text/event-stream" in its HTTP requests. This change aligns the header configuration of SendNotification with that of the existing SendRequest method. No other logic, error handling, or control flow has been altered.

Changes

Files	Change Summary
client/transport/streamable_http.go	Added "Accept: application/json, text/event-stream" header to the SendNotification HTTP requests.

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Reviewing files that changed from the base of the PR and between ae96a68 and 3084c53.

📒 Files selected for processing (1)

• client/transport/streamable_http.go (1 hunks)

🔇 Additional comments (1)

client/transport/streamable_http.go (1)

359-359: LGTM - Accept header addition is correct and necessary

The addition of the Accept header with "application/json, text/event-stream" in the SendNotification method brings this method in line with the SendRequest method (line 168) and ensures compliance with the Model Context Protocol specification dated 2025-03-26. This properly indicates to the server that the client can handle both JSON responses and event streams, which is essential for correct content negotiation.

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