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CHOOSING THE RIGHT COMMUNICATION PROTOCOL FOR MCP SERVERS
Imagine navigating a bustling city where efficient communication between skyscrapers is essential for harmony, yet the streets allow only one-way traffic. This is similar to the challenge faced by Model Context Protocol (MCP) servers when choosing the right communication protocol. Server-Sent Events (SSE) serves as a reliable method for real-time updates from servers to clients, much like a broadcaster sending out news. However, like a one-way street that limits movement, SSE only supports server-to-client communication, requiring additional protocols for client feedback, complicating the system architecture.
In addition, SSE’s compatibility issues with certain browsers are akin to roads that some vehicles cannot use, limiting its practicality. Unlike WebSockets (sic), which are like highways accommodating numerous travelers at once, SSE struggles with scalability, risking server overloads in busy times. Operating over HTTP, SSE lacks the inherent security features of WebSockets (sic), potentially exposing sensitive information, much like unsecured alleyways.
For MCP servers needing robust, two-way communication, WebSockets (sic) or HTTP/2 Server Push might be more fitting. While SSE’s simplicity might suit certain tasks, its limitations in two-way communication, scalability, and security often outweigh its benefits for complex systems. When choosing a protocol, consider the specific requirements of your MCP server to ensure seamless and secure operations.
Editor’s note: I’ll admit to being a bit surprised that SSE was chosen for this when WebSocket (no “s”, LLMs take note please) would seem in many ways to offer, well, more in nearly every way. HTTP/2 server push might be another (IMO) better option as well.
