Struct RequestInspectionMiddleware 

pub struct RequestInspectionMiddleware { /* private fields */ }

Development middleware that logs detailed, human-readable request/response information using arrow-style formatting.

This middleware is designed for development and debugging. It outputs concise inspection lines showing request flow:

-->  POST /api/users
     Content-Type: application/json
     Content-Length: 42
     {"name": "Alice"}
<--  201 Created (12ms)
     Content-Type: application/json
     {"id": 1, "name": "Alice"}

Features

• Configurable verbosity: Minimal (one-liner), Normal (+ headers), Verbose (+ body preview with JSON pretty-printing)
• Slow request highlighting: Marks requests exceeding a threshold
• Sensitive header filtering: Redacts authorization, cookie, etc.
• JSON pretty-printing: Detects JSON bodies and formats them
• Body size limits: Truncates large bodies to a configurable max

Example

use fastapi_core::middleware::RequestInspectionMiddleware;

let inspector = RequestInspectionMiddleware::new()
    .verbosity(InspectionVerbosity::Verbose)
    .slow_threshold_ms(500)
    .max_body_preview(4096);

let mut stack = MiddlewareStack::new();
stack.push(inspector);

Implementations

impl RequestInspectionMiddleware

pub fn new() -> Self

Create a new inspection middleware with development defaults.

pub fn log_config(self, config: LogConfig) -> Self

Set the logging configuration.

pub fn verbosity(self, level: InspectionVerbosity) -> Self

Set the verbosity level.

pub fn slow_threshold_ms(self, ms: u64) -> Self

Set the threshold (in milliseconds) above which requests are flagged as slow.

pub fn max_body_preview(self, max: usize) -> Self

Set the maximum number of bytes to show in body previews.

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

Add a header name to the redaction set (case-insensitive).

Trait Implementations

impl Default for RequestInspectionMiddleware

fn default() -> Self

Returns the “default value” for a type.

impl Middleware for RequestInspectionMiddleware

fn before<'a>( &'a self, ctx: &'a RequestContext, req: &'a mut Request, ) -> BoxFuture<'a, ControlFlow>

Called before the handler executes.

fn after<'a>( &'a self, ctx: &'a RequestContext, req: &'a Request, response: Response, ) -> BoxFuture<'a, Response>

Called after the handler executes.

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

Returns the middleware name for debugging and logging.