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Form

Struct Form 

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pub struct Form<T>(pub T);
Expand description

URL encoded extractor and response.

§As extractor

If used as an extractor, Form will deserialize form data from the request, specifically:

  • If the request has a method of GET or HEAD, the form data will be read from the query string (same as with Query)
  • If the request has a different method, the form will be read from the body of the request. It must have a content-type of application/x-www-form-urlencoded for this to work. If you want to parse multipart/form-data request bodies, use Multipart instead.

This matches how HTML forms are sent by browsers by default. In both cases, the inner type T must implement [serde::Deserialize].

⚠️ Since parsing form data might require consuming the request body, the Form extractor must be last if there are multiple extractors in a handler. See “the order of extractors”

use axum::Form;
use serde::Deserialize;

#[derive(Deserialize)]
struct SignUp {
    username: String,
    password: String,
}

async fn accept_form(Form(sign_up): Form<SignUp>) {
    // ...
}

§As response

Form can also be used to encode any type that implements [serde::Serialize] as application/x-www-form-urlencoded

use axum::Form;
use serde::Serialize;

#[derive(Serialize)]
struct Payload {
    value: String,
}

async fn handler() -> Form<Payload> {
    Form(Payload { value: "foo".to_owned() })
}

Tuple Fields§

§0: T

Trait Implementations§

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impl<T> Clone for Form<T>
where T: Clone,

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fn clone(&self) -> Form<T>

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T> Copy for Form<T>
where T: Copy,

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impl<T> Debug for Form<T>
where T: Debug,

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

Formats the value using the given formatter. Read more
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impl<T> Default for Form<T>
where T: Default,

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fn default() -> Form<T>

Returns the “default value” for a type. Read more
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impl<T> Deref for Form<T>

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type Target = T

The resulting type after dereferencing.
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fn deref(&self) -> &<Form<T> as Deref>::Target

Dereferences the value.
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impl<T> DerefMut for Form<T>

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fn deref_mut(&mut self) -> &mut <Form<T> as Deref>::Target

Mutably dereferences the value.
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impl<T, S> FromRequest<S> for Form<T>
where T: DeserializeOwned, S: Send + Sync,

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type Rejection = FormRejection

If the extractor fails it’ll use this “rejection” type. A rejection is a kind of error that can be converted into a response.
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async fn from_request( req: Request<Body>, _state: &S, ) -> Result<Form<T>, <Form<T> as FromRequest<S>>::Rejection>

Perform the extraction.
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impl<T> IntoResponse for Form<T>
where T: Serialize,

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fn into_response(self) -> Response<Body>

Create a response.

Auto Trait Implementations§

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impl<T> Freeze for Form<T>
where T: Freeze,

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impl<T> RefUnwindSafe for Form<T>
where T: RefUnwindSafe,

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impl<T> Send for Form<T>
where T: Send,

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impl<T> Sync for Form<T>
where T: Sync,

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impl<T> Unpin for Form<T>
where T: Unpin,

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impl<T> UnsafeUnpin for Form<T>
where T: UnsafeUnpin,

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impl<T> UnwindSafe for Form<T>
where T: UnwindSafe,

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,

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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,

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

Mutably borrows from an owned value. Read more
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impl<ST, DT> CastableFrom<ST, Initialized, Initialized> for DT
where ST: ?Sized, DT: ?Sized,

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impl<ST, DT> CastableFrom<ST, Uninit, Uninit> for DT
where ST: ?Sized, DT: ?Sized,

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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> Formattable for T
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Returns the argument unchanged.

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fn from_ref(input: &T) -> T

Converts to this type from a reference to the input type.
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impl<T, S> Handler<IntoResponseHandler, S> for T
where T: IntoResponse + Clone + Send + Sync + 'static,

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type Future = Ready<Response<Body>>

The type of future calling this handler returns.
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fn call( self, _req: Request<Body>, _state: S, ) -> <T as Handler<IntoResponseHandler, S>>::Future

Call the handler with the given request.
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fn layer<L>(self, layer: L) -> Layered<L, Self, T, S>
where L: Layer<HandlerService<Self, T, S>> + Clone, <L as Layer<HandlerService<Self, T, S>>>::Service: Service<Request<Body>>,

Apply a tower::Layer to the handler. Read more
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fn with_state(self, state: S) -> HandlerService<Self, T, S>

Convert the handler into a Service by providing the state
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impl<H, T> HandlerWithoutStateExt<T> for H
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fn into_service(self) -> HandlerService<H, T, ()>

Convert the handler into a Service and no state.
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Convert the handler into a MakeService and no state. Read more
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fn into_make_service_with_connect_info<C>( self, ) -> IntoMakeServiceWithConnectInfo<HandlerService<H, T, ()>, C>

Convert the handler into a MakeService which stores information about the incoming connection and has no state. Read more
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impl<A, B, T> HttpServerConnExec<A, B> for T
where B: Body,

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Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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