Streamable HTTP

Streamable HTTP: The MCP HTTP binding where each message is a POST to one endpoint and replies come as JSON or a request-scoped SSE stream. Example: Zapier MCP requires clients that support Streamable HTTP. Next in the glossary is Tasks extension: An official MCP extension for long-running operations with polling and durable handles, moved out of core in 2026-07-28.

Definition

The MCP HTTP binding where each message is a POST to one endpoint and replies come as JSON or a request-scoped SSE stream.

Example, with source

Zapier MCP requires clients that support Streamable HTTP. (docs.zapier.com, read 4 November 2026)

Where it appears on this site

• MCP
• Building a remote MCP server

Neighbouring terms

• Step-up authorization: Requesting a wider scope set after a 403 insufficient_scope challenge, keeping previously granted scopes.
• Tasks extension: An official MCP extension for long-running operations with polling and durable handles, moved out of core in 2026-07-28.
• Tool: A function an MCP server offers for the model to call, with a name, description and input schema.