Struct EarlyHintsLayer 

pub struct EarlyHintsLayer { /* private fields */ }

Middleware that sends the same Link hints for every request, then hands it on.

Implementations

impl EarlyHintsLayer

pub fn new<I, S>(links: I) -> EarlyHintsLayer

where I: IntoIterator<Item = S>, S: Into<String>,

links are Link header values, e.g. </app.css>; rel=preload; as=style. Invalid ones are dropped.

pub fn links(&self) -> &[String]

Trait Implementations

impl Clone for EarlyHintsLayer

fn clone(&self) -> EarlyHintsLayer

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for EarlyHintsLayer

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

Formats the value using the given formatter.

impl Middleware for EarlyHintsLayer

fn runs_inline(&self, _request: &Request, _connection: &ConnectionInfo) -> bool

Queueing a hint never blocks.

fn handle( &self, request: &Request, connection: &ConnectionInfo, next: &dyn Application, ) -> Result<Response, String>

fn accepts_streamed_body( &self, _request: &Request, _connection: &ConnectionInfo, ) -> bool

true when this layer never reads request.body, so the inner application may receive it as a stream (Application::streams_body). A layer that inspects the body (CSRF tokens in a form, request signatures, rewriting) must keep the default false: it would see an empty body.

fn is_passthrough( &self, _request: &Request, _connection: &ConnectionInfo, ) -> bool

true when handle would do nothing for request but call next (e.g. a rate limit that isn’t configured). A WithMiddleware stack offers the inner application’s execute_async only if every layer passes the request through. Default false.

fn answers_streamed_body( &self, _request: &Request, _connection: &ConnectionInfo, ) -> bool

true when this layer answers request itself — it doesn’t call next — and reads its body as a stream (a proxy forwarding it as it arrives). The body is then streamed whatever the layers after it and the application would say. Requires accepts_streamed_body. Since 18.3.0.

fn layer_name(&self) -> &'static str

A short name for this layer, as tools that describe an app list it (Application::middleware_names): by default the type’s name without its module path or generic parameters (CacheLayer). Since 18.28.0.