What is an MCP Streamable HTTP?

MCP Streamable HTTP is the current standard network transport for the Model Context Protocol, using a single HTTP endpoint that can respond either as a normal request-response or upgrade to a streamed series of messages.

Streamable HTTP replaced the earlier SSE-based transport by collapsing MCP's client-to-server and server-to-client traffic onto one POST endpoint. A client sends a JSON-RPC message to that endpoint, and the server can reply immediately with a single JSON response, or keep the HTTP response open and stream multiple messages down it, such as progress updates and intermediate results, before closing. This removes the need for a separate persistent connection just to receive server-initiated messages.

This design plays much better with ordinary web infrastructure — reverse proxies, CDNs, serverless functions, and load balancers — because it looks like standard HTTP traffic rather than a long-lived out-of-band stream that some infrastructure mishandles. It also supports resumability: a client can reconnect with a last-seen message ID and the server can replay what was missed, which matters for flaky networks like a mobile or sandboxed client connection.

Streamable HTTP is now the recommended transport for any MCP server that isn't a same-machine local subprocess, effectively the network-facing counterpart to stdio's local-process model.

In practice with Neotask

Neotask's MCP proxy exposes its remote integrations to sandboxed agents over Streamable HTTP, which lets tool calls and their streamed results pass cleanly through the same AWS-hosted infrastructure and load balancing that the rest of the platform's API traffic already relies on.

Related terms

• MCP SSE (Server-Sent Events)
• MCP Transport
• MCP stdio
• MCP Gateway

Plans

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