Panics in Rust Workers were historically fatal, poisoning the entire instance. By collaborating upstream on the wasm‑bindgen project, Rust Workers now support resilient critical error recovery, including panic unwinding using WebAssembly Exception Handling.
Software Engineering
Making Rust Workers reliable: panic and abort recovery in wasm‑bindgen
Cloudflare Blog · 2026-04-22
Related items
Software EngineeringCloudflare Developer Platform Changelog
Workers - Panic Recovery for Rust Workers
In workers-rs , Rust panics were previously non-recoverable. A panic would put the Worker into an invalid state, and further function calls could result in memory overflows or exceptions. Now, when a panic occurs, in-flight requests will throw 500 errors, but the Worker will automatically and instantly recover for f...
Software EngineeringCloudflare Developer Platform Changelog
Workers, Pages - Smart Placement is smarter about running Workers and Pages Functions in the best locations
Smart Placement is a unique Cloudflare feature that can make decisions to move your Worker to run in a more optimal location (such as closer to a database). Instead of always running in the default location (the one closest to where the request is received), Smart Placement uses certain “heuristics” (rules and thres...
Software EngineeringCloudflare Developer Platform Changelog
Workers - Workers Static Assets: Corrected handling of double slashes in redirect rule paths
Static Assets : Fixed a bug in how redirect rules defined in your Worker's redirects file are processed. If you're serving Static Assets with a redirects file containing a rule like /ja/ /:splat , paths with double slashes were previously misinterpreted as external URLs. For example, visiting /ja//example.com would...
Software EngineeringCloudflare Developer Platform Changelog
Containers - Container logs page now includes relevant Worker and Durable Object logs
The Container logs page now displays related Worker and Durable Object logs alongside container logs. This co-locates all relevant log events for a container application in one place, making it easier to trace requests and debug issues. You can filter to a single source when you need to isolate Container, Worker, or...
Software EngineeringCloudflare Developer Platform Changelog
Agents, Workers - Agents SDK v0.12.4: chat recovery, routing retries, durable Think submissions, and Voice connection control
The latest release of the Agents SDK brings more reliable chat recovery, fixes Agent state synchronization during reconnects, adds durable submissions for Think, exposes routing retry configuration, and adds connection control for Voice agents. Chat recovery improvements @cloudflare/ai-chat now keeps server turns ru...
Software EngineeringCloudflare Developer Platform Changelog
Pipelines, Workers - Dropped event metrics, typed Pipelines bindings, and improved setup
Cloudflare Pipelines ingests streaming data via Workers or HTTP endpoints, transforms it with SQL, and writes it to R2 as Apache Iceberg tables. Today we're shipping three improvements to help you understand why streaming events get dropped, catch data quality issues early, and set up Pipelines faster. Dropped event...