Middleware for STDIO transport not supported

7/10 High

Traditional ASGI middleware only works with web-based transports (streamable-HTTP, SSE), not with the STDIO transport that most major MCP clients use. This forces developers to either wrap servers in complex workarounds or abandon middleware patterns.

MCPASGI
Category
architecture
Workaround
partial
Stage
build
Freshness
persistent
Scope
framework
Upstream
open
Recurring
Yes
Buyer Type
team
Maintainer
active

Sources

Collection History

Query: “What are the most common pain points with FastMCP for developers in 2025?”4/8/2026

Until very recently, most major clients only supported the local STDIO transport, making this a non-starter for many... it forces you to parse the MCP's low-level JSON-RPC messages yourself.

Created: 4/8/2026Updated: 4/8/2026