Struct RequestIdLayer 

pub struct RequestIdLayer { /* private fields */ }

Middleware that ensures every request/response pair carries a stable correlation ID.

• If the incoming request already has the header (e.g. set by an upstream gateway, load balancer, or calling service), that exact value is kept and echoed back unchanged — this lets one ID follow a request across multiple services instead of getting a new one at each hop.
• Otherwise, a fresh ID is generated with generate_request_id and injected into the request before it reaches your handler, so handlers can read it like any other header.
• The same value is always set on the response, so the caller can log it too — even if it arrived with no ID and this middleware generated one.

Implementations

impl RequestIdLayer

pub fn new() -> Self

Uses the default header name, DEFAULT_HEADER (X-Request-Id).

pub fn header(self, name: impl Into<String>) -> Self

Use a different header name, e.g. "X-Correlation-Id".

Trait Implementations

impl Default for RequestIdLayer

fn default() -> Self

Returns the “default value” for a type.

impl Middleware for RequestIdLayer

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