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Guide: additional tweaks to Middleware.
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# Middleware
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Actix's middleware system allows us to add additional behavior to request/response processing.
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Middleware can hook into an incoming request process, enabling the ability to modify requests
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as well as the ability to halt request processing and return response early.
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Middleware can hook into an incoming request process, enabling us to modify requests
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as well as halt request processing to return a response early.
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Middleware can also hook into response processing.
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@ -19,7 +19,7 @@ registration. In general, a *middleware* is a type that implements the
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in this trait has a default implementation. Each method can return a result immediately
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or a *future* object.
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The following is an example of a simple middleware that adds request and response headers:
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The following demonstrates using middleware to add request and response headers:
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```rust
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# extern crate http;
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@ -68,8 +68,8 @@ It is common to register a logging middleware as the first middleware for the ap
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Logging middleware must be registered for each application.
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The `Logger` middleware uses the standard log crate to log information. You should enable logger
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for *actix_web* package to see access log
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([env_logger](https://docs.rs/env_logger/*/env_logger/) or similar).
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for *actix_web* package to see access log ([env_logger](https://docs.rs/env_logger/*/env_logger/)
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or similar).
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### Usage
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`ErrorHandlers` middleware allows us to provide custom handlers for responses.
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You can use the `ErrorHandlers::handler()` method to register a custom error handler
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for specific status code. You can modify an existing response or create completly new
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for a specific status code. You can modify an existing response or create a completly new
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one. The error handler can return a response immediately or return a future that resolves
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into a response.
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