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# Migrating to 2.0.0
- `HttpServer::start()` renamed to `HttpServer::run()`. It also possible to `.await` on `run` method result, in that case it awaits server exit.
- `App::register_data()` renamed to `App::app_data()` and accepts any type `T: 'static`. Stored data is available via `HttpRequest::app_data()` method at runtime.
- Extractor configuration must be registered with `App::app_data()` instead of `App::data()`
- Sync handlers has been removed. `.to_async()` method has been renamed to `.to()` replace `fn` with `async fn` to convert sync handler to async
- `actix_http_test::TestServer` moved to `actix_web::test` module. To start test server use `test::start()` or `test_start_with_config()` methods
- `ResponseError` trait has been refactored. `ResponseError::error_response()` renders http response.
- Feature `rust-tls` renamed to `rustls`
instead of
```rust
actix-web = { version = "2.0.0", features = ["rust-tls"] }
```
use
```rust
actix-web = { version = "2.0.0", features = ["rustls"] }
```
- Feature `ssl` renamed to `openssl`
instead of
```rust
actix-web = { version = "2.0.0", features = ["ssl"] }
```
use
```rust
actix-web = { version = "2.0.0", features = ["openssl"] }
```
- `Cors` builder now requires that you call `.finish()` to construct the middleware
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