#Middleware

Most Go HTTP servers accumulate authentication logic and rate limiting code directly in handler...

Originally published at HOL An unauthenticated request can skip path-scoped auth middleware in Fastify apps that use @fastify/middie. Middie decides whether to run path-scoped auth by looking at the raw request target.…

Historical changelog entry for Vercel Functions using the Edge Runtime are now in public beta. Preserves release context and points to current Vercel Functions guidance.

Set skipMiddlewareRequestBody to stop forwarding the client request body to Routing Middleware, reducing Fast Origin Transfer usage and helping improve Time to First Byte.

Write routing middleware in Python for FastAPI, Flask, Django, and other Python frameworks to rewrite, redirect, or answer requests before they reach your app.

Hey, sharing something I've been building. KAIRO is a TypeScript HTTP framework where every request passes through a structured security pipeline before touching your handler. Think of it as Express but the middleware stack is a threat model.…

If you have ever opened the raw node:http module and tried to write a real server with it, you...

If you've worked with Express.js for more than a week, you know the feeling: you ask Claude to add a...

Deciding what counts as a successful response in a `handle_response/1` after `Tesla.get`, instead of inside the Tesla middleware chain, makes 5xx and malformed payloads look like successful requests to your telemetry.

Execute custom logic at the moment of request, pushing personalization to the edge with exceptional performance.

AI SDK 3.4 introduces middleware, data stream protocol, and multi-step generations

Next.js 15.2 introduces experimental Node.js Middleware, now available at Vercel—giving you full Node.js runtime support for your Middleware. Run authentication, logging, request handling, and more with familiar Node.js APIs.

A security vulnerability in Next.js was responsibly disclosed, which allows malicious actors to bypass authorization in Middleware when targetting the x-middleware-subrequest header.

Last week, we published CVE-2025-29927 and patched a critical severity vulnerability in Next.js. Here’s our post-incident analysis and next steps.

In the process of remediating CVE-2025-29927, we looked at other possible exploits of Middleware. We independently verified this low severity vulnerability at the same time as two further reports from independent researchers.

The Vercel Observability dashboard now includes a dedicated view for middleware, showing invocation counts and performance metrics.

The Edge runtime now runs on Vercel Functions, unifying pricing across all compute, and available before and after cache. Edge Middleware and Edge Functions are now deprecated.

A vulnerability affecting Next.js Middleware has been addressed. It impacted versions prior to v14.2.32 and v15.4.7.

If you've built any web application in Go, you've probably heard about middlewares. But what exactly...