Module http_middleware 

Available on non-WebAssembly only.

Server-side HTTP middleware for request/response interception.

This module provides HTTP-level middleware for MCP servers, enabling:

• Request/response logging with sensitive data redaction
• Authentication and authorization
• Rate limiting and throttling
• Custom request/response transformation

Architecture

Server HTTP middleware operates at the HTTP transport layer (before JSON-RPC processing), providing symmetry with client-side HTTP middleware.

Two-layer model:

• HTTP Layer: ServerHttpMiddleware for transport-level concerns
• Protocol Layer: EnhancedMiddleware for JSON-RPC message processing

Examples

use pmcp::server::http_middleware::{ServerHttpMiddleware, ServerHttpLoggingMiddleware};
use pmcp::server::http_middleware::ServerHttpMiddlewareChain;
use std::sync::Arc;

// Create logging middleware with redaction
let logging = ServerHttpLoggingMiddleware::new()
    .with_redact_query(true)
    .with_max_body_bytes(1024);

// Build middleware chain
let mut chain = ServerHttpMiddlewareChain::new();
chain.add(Arc::new(logging));

Modules

adaptersstreamable-http

Framework adapters for converting between middleware types and framework types.

Structs

ServerHttpContext

Context for server HTTP middleware processing.

ServerHttpLoggingMiddleware

Server HTTP logging middleware with sensitive data redaction.

ServerHttpMiddlewareChain

Chain of server HTTP middleware handlers.

ServerHttpRequest

HTTP request for server middleware processing.

ServerHttpResponse

HTTP response for server middleware processing.

Traits

ServerHttpMiddleware

Server-side HTTP middleware trait.