# actix-web-lab
> Experimental extractors, middleware, and other extras for possible inclusion in Actix Web.
[](https://crates.io/crates/actix-web-lab)
[](https://docs.rs/actix-web-lab/0.23.0)
[](https://deps.rs/crate/actix-web-lab/0.23.0)
[](https://crates.io/crates/actix-web-lab)
[](https://codecov.io/gh/robjtede/actix-web-lab)
## Features
**[Feature Voting →](https://github.com/robjtede/actix-web-lab/discussions/7)**
### Responders
- `Csv`: efficient CSV streaming [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/respond/struct.Csv.html)
- `NdJson`: efficient NDJSON streaming [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/respond/struct.NdJson.html)
- `DisplayStream`: efficient line-by-line `Display` streaming [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/respond/struct.DisplayStream.html)
- `Html`: (graduated 🎉) basic string wrapper that responds with HTML Content-Type [(docs)](https://docs.rs/actix-web/4/actix_web/web/struct.Html.html)
- `Cbor`: basic CBOR format wrapper with appropriate Content-Type [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/respond/struct.Cbor.html)
- `MessagePack`: basic MessagePack format wrapper with appropriate Content-Type [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/respond/struct.MessagePack.html)
- `Sse`: semantic server-sent events (SSE) responder with a channel-like interface [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/sse/index.html)
### Middleware
- `from_fn`: (graduated 🎉) use an async function as a middleware [(docs)](https://docs.rs/actix-web/4/actix_web/middleware/fn.from_fn.html)
- `map_response`: use an async function to modify the response [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/middleware/fn.map_response.html)
- `map_response_body`: use an async function to modify the response body [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/middleware/fn.map_response_body.html)
- `RedirectHttps`: middleware to redirect traffic to HTTPS if connection is insecure with optional HSTS [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/middleware/struct.RedirectHttps.html)
- `redirect_to_www`: function middleware to redirect traffic to `www.` if not already there [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/middleware/fn.redirect_to_www.html)
- `redirect_to_non_www`: function middleware to redirect traffic to `www.` if not already there [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/middleware/fn.redirect_to_non_www.html)
- `ErrorHandlers`: alternative error handler middleware with simpler interface [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/middleware/struct.ErrorHandlers.html)
- `NormalizePath`: alternative path normalizing middleware with redirect option [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/middleware/struct.NormalizePath.html)
- `CatchPanic`: catch panics in wrapped handlers and middleware, returning empty 500 responses [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/middleware/struct.CatchPanic.html)
- `PanicReporter`: catch panics in wrapped handlers and middleware, returning empty 500 responses [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/middleware/struct.PanicReporter.html)
- `LoadShed`: sheds load when the inner service isn't ready [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/middleware/struct.LoadShed.html)
### Extractors
- `LazyData`: app data/state initialized on first use [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/extract/struct.LazyData.html)
- `SwapData`: app data/state that can be replaced at runtime (alternative to `Data>`) [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/extract/struct.SwapData.html)
- `LocalData`: app data/state that uses an `Rc` internally, avoiding atomic overhead (alternative to `Data>`) [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/extract/struct.LocalData.html)
- `ThinData`: (graduated 🎉) app data/state for cheaply-cloned types [(docs)](https://docs.rs/actix-web/4/actix_web/web/struct.ThinData.html)
- `Json`: simplified JSON extractor with const-generic payload limits [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/extract/struct.Json.html)
- `Path`: simplified path parameter extractor that supports destructuring [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/extract/struct.Path.html)
- `Query`: simplified query-string extractor that can also collect multi-value items [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/extract/struct.Query.html)
- `RequestSignature`: wraps an extractor and calculates a request signature alongside [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/extract/struct.RequestSignature.html)
- `BodyLimit`: wraps a body extractor and prevents DoS attacks by limiting payload size [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/extract/struct.BodyLimit.html)
- `Bytes`: simplified Bytes extractor with const-generic limits [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/extract/struct.Bytes.html)
- `UrlEncodedForm`: URL-encoded form extractor with const-generic payload size limit [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/extract/struct.UrlEncodedForm.html)
- `Host`: Host information taken from either URL or Host header [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/extract/struct.Host.html)
### Macros
- `FromRequest`: Derive macro to implement `FromRequest` on an aggregate struct of other extractors [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/derive.FromRequest.html)
### Headers
- `CacheControl`: Cache-Control typed header with support for modern directives [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/header/struct.CacheControl.html)
- `ClearSiteData`: Clear-Site-Data typed header [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/header/struct.ClearSiteData.html)
- `ContentLength`: Content-Length typed header [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/header/struct.ContentLength.html)
- `Forwarded`: Proxy and original client info [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/header/struct.Forwarded.html)
- `StrictTransportSecurity`: Strict-Transport-Security (HSTS) configuration [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/header/struct.StrictTransportSecurity.html)
### Body Types
- `channel`: a simple channel-like body type with a sender side that can be used from another thread [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/body/fn.channel.html)
- `writer`: a simple `AsyncWrite` body type [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/body/fn.writer.html)
### Services
- `Redirect`: (graduated 🎉) simple redirects [(docs)](https://docs.rs/actix-web/4/actix_web/web/struct.Redirect.html)
- `spa`: Easy Single-page Application (SPA) service [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/web/fn.spa.html)
### Route Guards
- `Acceptable`: (graduated 🎉) verifies that an `Accept` header is present and it contains a compatible MIME type [(docs)](https://docs.rs/actix-web/4/actix_web/guard/struct.Acceptable.html)
### Test Utilities
- `test_request`: construct `TestRequest` using an HTTP-like DSL [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/test/macro.test_request.html)
- `assert_response_matches`: quickly write tests that check various parts of a `ServiceResponse` [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/test/macro.assert_response_matches.html)
### Other Utilities
- `fork_request_payload`: effectively clone a request payload [(docs)](https://docs.rs/actix-web-lab/0.23.0/actix_web_lab/util/fn.fork_request_payload.html)
## 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.