# [−][src]Struct actix_web::error::Error

    pub struct Error { /* fields omitted */ }

General purpose actix web error.

An actix web error is used to carry errors from `failure` or `std::error` through actix in a convenient way. It can be created through converting errors with `into()`.

Whenever it is created from an external object a response error is created for it that can be used to create an http response from it this means that if you have access to an actix `Error` you can always get a `ResponseError` reference from it.

## Methods

###

`impl Error`

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`pub fn cause(&self) -> &ResponseError`

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Deprecated since 0.6.0

: please use `Error::as_response_error()` instead

Deprecated way to reference the underlying response error.

####

`pub fn as_fail(&self) -> &Fail`

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Returns a reference to the underlying cause of this `Error` as `Fail`

####

`pub fn as_response_error(&self) -> &ResponseError`

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Returns the reference to the underlying `ResponseError`.

####

`pub fn backtrace(&self) -> &Backtrace`

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Returns a reference to the Backtrace carried by this error, if it carries one.

This uses the same `Backtrace` type that `failure` uses.

####

`pub fn downcast_ref<T: Fail>(&self) -> Option<&T>`

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Attempts to downcast this `Error` to a particular `Fail` type by reference.

If the underlying error is not of type `T`, this will return `None`.

## Trait Implementations

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`impl From<Error> for HttpResponse`

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Convert `Error` to a `HttpResponse` instance

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`fn from(err: Error) -> Self`

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Performs the conversion.

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`impl<T: ResponseError> From<T> for Error`

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`Error` for any error that implements `ResponseError`

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`fn from(err: T) -> Error`

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Performs the conversion.

###

`impl From<Error> for Error`

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####

`fn from(err: Error) -> Error`

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Performs the conversion.

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`impl From<Error> for HttpDispatchError`

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####

`fn from(err: Error) -> Self`

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Performs the conversion.

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`impl From<Error> for ClientError`

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`fn from(err: Error) -> ClientError`

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Performs the conversion.

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`impl Display for Error`

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`fn fmt(&self, f: &mut Formatter) -> Result`

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Formats the value using the given formatter. Read more

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`impl Debug for Error`

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####

`fn fmt(&self, f: &mut Formatter) -> Result`

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Formats the value using the given formatter. Read more

## Auto Trait Implementations

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`impl Send for Error`

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`impl Sync for Error`

## Blanket Implementations

###

`impl<T> ToString for T where T: Display + ?Sized,`

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####

`fn to_string(&self) -> String`

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Converts the given value to a `String`. Read more

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`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.

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`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

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`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

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

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#### `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>`

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

Performs the conversion.

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`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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