# SessionKey in actix_session::storage - Rust
A session key, the string stored in a client-side cookie to associate a user with its session state on the backend.
Keywords: rust, rustlang, rust-lang, SessionKey

# Struct actix_session::storage::SessionKey

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    pub struct SessionKey(_);

Expand description

A session key, the string stored in a client-side cookie to associate a user with its session state on the backend.

### Validation

Session keys are stored as cookies, therefore they cannot be arbitrary long. We require session keys to be smaller than 4064 bytes.

    use std::convert::TryInto;
    use actix_session::storage::SessionKey;

    let key: String = std::iter::repeat('a').take(4065).collect();
    let session_key: Result<SessionKey, _> = key.try_into();
    assert!(session_key.is_err());

## Trait Implementations

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### impl AsRef<str> for SessionKey

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#### fn as_ref(&self) -> &str

Converts this type into a shared reference of the (usually inferred) input type.

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### impl Debug for SessionKey

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#### fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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### impl From<SessionKey> for String

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#### fn from(k: SessionKey) -> Self

Converts to this type from the input type.

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### impl PartialEq<SessionKey> for SessionKey

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#### fn eq(&self, other: &SessionKey) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

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#### fn ne(&self, other: &SessionKey) -> bool

This method tests for `!=`.

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### impl TryFrom<String> for SessionKey

#### type Error = InvalidSessionKeyError

The type returned in the event of a conversion error.

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#### fn try_from(v: String) -> Result<Self, Self::Error>

Performs the conversion.

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### impl Eq for SessionKey

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### impl StructuralEq for SessionKey

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### impl StructuralPartialEq for SessionKey

## Auto Trait Implementations

### impl RefUnwindSafe for SessionKey

### impl Send for SessionKey

### impl Sync for SessionKey

### impl Unpin for SessionKey

### impl UnwindSafe for SessionKey

## Blanket Implementations

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

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#### fn type_id(&self) -> TypeId

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

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

const: unstable · source

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

Immutably borrows from an owned value. Read more

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

const: unstable · source

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

Mutably borrows from an owned value. Read more

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### impl<Q, K> Equivalent<K> for Q where
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,

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#### fn equivalent(&self, key: &K) -> bool

Compare self to `key` and return `true` if they are equal.

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### impl<T> From<T> for T

const: unstable · source

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

Returns the argument unchanged.

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### impl<T> Instrument for T

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#### fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided `Span`, returning an `Instrumented` wrapper. Read more

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#### fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current `Span`, returning an `Instrumented` wrapper. Read more

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

const: unstable · source

#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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### impl<T> Same<T> for T

#### type Output = T

Should always be `Self`

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### impl<T, U> TryFrom<U> for T where
U: Into<T>,

#### type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

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

Performs the conversion.

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

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

The type returned in the event of a conversion error.

const: unstable · source

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

Performs the conversion.

### impl<V, T> VZip<V> for T where
V: MultiLane<T>,

#### fn vzip(self) -> V

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### impl<T> WithSubscriber for T

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#### fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self> where
S: Into<Dispatch>,

Attaches the provided `Subscriber` to this type, returning a `WithDispatch` wrapper. Read more

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#### fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default `Subscriber` to this type, returning a `WithDispatch` wrapper. Read more