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MCP protocol updates: HTTP+SSE deprecated, stdio and Streamable HTTP recommended

By PulseAugur Editorial · [1 sources] ·

The MCP protocol has seen significant changes, with the HTTP+SSE transport method deprecated as of March 26, 2025. Developers are advised to avoid new implementations using this method. For local communication where a single client launches the server on the same machine, the stdio transport is recommended. This method involves the client and server communicating via standard input and output streams, with logging directed to stderr to avoid corrupting the JSON-RPC message channel. For network-accessible servers or multi-client scenarios, Streamable HTTP is the preferred transport, utilizing a single POST endpoint for each JSON-RPC message and supporting both JSON and Server-Sent Events (SSE) for responses. AI

IMPACT Provides guidance on choosing and implementing specific communication protocols for AI applications, impacting development efficiency.

RANK_REASON Article details changes to a specific protocol (MCP) and its transport methods, offering practical advice for developers.

Read on dev.to — MCP tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

MCP protocol updates: HTTP+SSE deprecated, stdio and Streamable HTTP recommended

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Article details changes to a specific protocol (MCP) and its transport methods, offering practical advice for developers.
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Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
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product, infra
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High
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52 days old
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COVERAGE [1]

  1. dev.to — MCP tag TIER_1 English(EN) · Matthias | StudioMeyer ·

    MCP Transports: stdio vs HTTP, and What Just Changed

    <p>Our own search data has been telling me to write this for months and I ignored it. Thirty-one different spellings of the same question, things like "stdio vs http mcp" and "mcp server stdio vs http", nearly three hundred impressions, several of them sitting on page one. Zero c…

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