#actix #http #web #framework #async


In-progress extractors and middleware for Actix Web

37 releases (17 breaking)

Uses new Rust 2021

0.18.2 Sep 13, 2022
0.17.0 Aug 9, 2022
0.16.7 Jul 27, 2022
0.15.0 Mar 7, 2022

#174 in HTTP server

Download history 1273/week @ 2022-06-06 1357/week @ 2022-06-13 1223/week @ 2022-06-20 1678/week @ 2022-06-27 1630/week @ 2022-07-04 1362/week @ 2022-07-11 1471/week @ 2022-07-18 1893/week @ 2022-07-25 2013/week @ 2022-08-01 1496/week @ 2022-08-08 1690/week @ 2022-08-15 1726/week @ 2022-08-22 1351/week @ 2022-08-29 1179/week @ 2022-09-05 1598/week @ 2022-09-12 1197/week @ 2022-09-19

5,379 downloads per month




Experimental extractors, middleware, and other extras for possible inclusion in Actix Web.

crates.io Documentation MIT or Apache 2.0 licensed
dependency status Download CircleCI


Feature Voting →


  • Csv: efficient CSV streaming (docs)
  • NdJson: efficient NDJSON streaming (docs)
  • DisplayStream: efficient line-by-line Display streaming (docs)
  • Html: basic string wrapper that responds with HTML Content-Type (docs)
  • Sse: semantic server-sent events (SSE) responder with a channel-like interface (docs)


  • from_fn: use an async function as a middleware (docs)
  • RedirectHttps: middleware to redirect traffic to HTTPS if connection is insecure with optional HSTS (docs)
  • redirect_to_www: function middleware to redirect traffic to www. if not already there (docs)
  • ErrorHandlers: alternative error handler middleware with simpler interface (docs)
  • NormalizePath: alternative path normalizing middleware with redirect option (docs)
  • CatchPanic: catch panics in wrapped handlers and middleware, returning empty 500 responses (docs)
  • PanicReporter: catch panics in wrapped handlers and middleware, returning empty 500 responses (docs)
  • LoadShed: sheds load when the inner service isn't ready (docs)


  • LazyData: app data/state initialized on first use (docs)
  • SwapData: app data/state that can be replaced at runtime (alternative to Data<RwLock<T>>) (docs)
  • LocalData: app data/state that uses an Rc internally, avoiding atomic overhead (alternative to Data<RwLock<T>>) (docs)
  • Json: simplified JSON extractor with const-generic limits (docs)
  • Path: simplified path parameter extractor that supports destructuring (docs)
  • Query: simplified query-string extractor that can also collect multi-value items (docs)
  • RequestSignature: wraps an extractor and calculates a request signature alongside (docs)
  • BodyLimit: wraps a body extractor and prevents DoS attacks by limiting payload size (docs)


  • FromRequest: Derive macro to implement FromRequest on an aggregate struct of other extractors (docs)


  • StrictTransportSecurity: Strict-Transport-Security (HSTS) configuration (docs)
  • CacheControl: Cache-Control typed header with support for modern directives (docs)
  • ContentLength: Content-Length typed header (docs)

Body Types

  • channel: a simple channel-like body type with a sender side that can be used from another thread (docs)
  • writer: a simple AsyncWrite body type (docs)


  • Redirect: simple redirects (docs)
  • spa: Easy Single-page Application (SPA) service (docs)

Route Guards

  • Acceptable: verifies that an Accept header is present and it contains a compatible MIME type (docs)

Test Utilities

  • test_request: Construct TestRequest using an HTTP-like DSL (docs)
  • assert_response_matches: quickly write tests that check various parts of a ServiceResponse (docs)

Things To Know About This Crate

  • It will never reach v1.0.
  • Minimum Supported Rust Version (MSRV) is latest stable at the time of each release.
  • Breaking changes will likely happen on most 0.x version bumps.
  • Documentation might be limited for some items.
  • Items that graduate to Actix Web crate will be marked deprecated here for a reasonable amount of time so you can migrate.
  • Migrating will often be as easy as dropping the _lab suffix from imports.


~543K SLoC