# [−][src]Struct actix_web::middleware::Logger

    pub struct Logger { /* fields omitted */ }

`Middleware` for logging request and response info to the terminal.

`Logger` middleware uses standard log crate to log information. You should enable logger for `actix_web` package to see access log. (`env_logger` or similar)

## Usage

Create `Logger` middleware with the specified `format`. Default `Logger` could be created with `default` method, it uses the default format:

ⓘThis example is not tested

     %a "%r" %s %b "%{Referer}i" "%{User-Agent}i" %T

    extern crate env_logger;
    use actix_web::middleware::Logger;
    use actix_web::App;

    fn main() {
        std::env::set_var("RUST_LOG", "actix_web=info");
        env_logger::init();

        let app = App::new()
            .middleware(Logger::default())
            .middleware(Logger::new("%a %{User-Agent}i"))
            .finish();
    }

## Format

`%%` The percent sign

`%a` Remote IP-address (IP-address of proxy if using reverse proxy)

`%t` Time when the request was started to process

`%r` First line of request

`%s` Response status code

`%b` Size of response in bytes, including HTTP headers

`%T` Time taken to serve the request, in seconds with floating fraction in .06f format

`%D` Time taken to serve the request, in milliseconds

`%{FOO}i` request.headers['FOO']

`%{FOO}o` response.headers['FOO']

`%{FOO}e` os.environ['FOO']

## Methods

###

`impl Logger`

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####

`pub fn new(format: &str) -> Logger`

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Create `Logger` middleware with the specified `format`.

####

`pub fn exclude<T: Into<String>>(self, path: T) -> Self`

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Ignore and do not log access info for specified path.

## Trait Implementations

###

`impl<S> Middleware<S> for Logger`

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####

`fn start(&self, req: &HttpRequest<S>) -> Result<Started>`

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Method is called when request is ready. It may return future, which should resolve before next middleware get called. Read more

####

`fn finish(&self, req: &HttpRequest<S>, resp: &HttpResponse) -> Finished`

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Method is called after body stream get sent to peer.

####

`fn response(&self, req: &HttpRequest<S>, resp: HttpResponse) -> Result<Response>`

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Method is called when handler returns response, but before sending http message to peer. Read more

###

`impl Default for Logger`

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####

`fn default() -> Logger`

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Create `Logger` middleware with format:

ⓘThis example is not tested

    %a "%r" %s %b "%{Referer}i" "%{User-Agent}i" %T

## Auto Trait Implementations

###

`impl Send for Logger`

###

`impl Sync for Logger`

## Blanket Implementations

###

`impl<T> From for T`

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####

`fn from(t: T) -> T`

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Performs the conversion.

###

`impl<T, U> Into for T where U: From<T>,`

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####

`fn into(self) -> U`

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Performs the conversion.

###

`impl<T, U> TryFrom for T where T: From<U>,`

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#### `type Error = !`

🔬 This is a nightly-only experimental API. (`try_from`)

The type returned in the event of a conversion error.

####

`fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>`

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🔬 This is a nightly-only experimental API. (`try_from`)

Performs the conversion.

###

`impl<T> Borrow for T where T: ?Sized,`

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####

`fn borrow(&self) -> &T`

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Immutably borrows from an owned value. Read more

###

`impl<T> BorrowMut for T where T: ?Sized,`

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####

`fn borrow_mut(&mut self) -> &mut T`

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Mutably borrows from an owned value. Read more

###

`impl<T, U> TryInto for T where U: TryFrom<T>,`

[src]

#### `type Error = <U as TryFrom<T>>::Error`

🔬 This is a nightly-only experimental API. (`try_from`)

The type returned in the event of a conversion error.

####

`fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>`

[src]

🔬 This is a nightly-only experimental API. (`try_from`)

Performs the conversion.

###

`impl<T> Any for T where T: 'static + ?Sized,`

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####

`fn get_type_id(&self) -> TypeId`

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🔬 This is a nightly-only experimental API. (`get_type_id`)

this method will likely be replaced by an associated static

Gets the `TypeId` of `self`. Read more

###

`impl<T> Erased for T`

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