Expand description

This crate adds a middleware for actix-web that captures errors and report them to Sentry.

To use this middleware just configure Sentry and then add it to your actix web app as a middleware. Because actix is generally working with non sendable objects and highly concurrent this middleware creates a new hub per request. As a result many of the sentry integrations such as breadcrumbs do not work unless you bind the actix hub.


use std::io;

use actix_web::{get, App, Error, HttpRequest, HttpServer};

async fn failing(_req: HttpRequest) -> Result<String, Error> {
    Err(io::Error::new(io::ErrorKind::Other, "An error happens here").into())

fn main() -> io::Result<()> {
    let _guard = sentry::init(sentry::ClientOptions {
        release: sentry::release_name!(),
    std::env::set_var("RUST_BACKTRACE", "1");

    let runtime = tokio::runtime::Builder::new_multi_thread()
    runtime.block_on(async move {
        HttpServer::new(|| {

Using Release Health

The actix middleware will automatically start a new session for each request when auto_session_tracking is enabled and the client is configured to use SessionMode::Request.

let _sentry = sentry::init(sentry::ClientOptions {
    release: sentry::release_name!(),
    session_mode: sentry::SessionMode::Request,
    auto_session_tracking: true,

Reusing the Hub

This integration will automatically create a new per-request Hub from the main Hub, and update the current Hub instance. For example, the following will capture a message in the current request’s Hub:

sentry::capture_message("Something is not well", sentry::Level::Warning);


Reports certain failures to Sentry.

A helper construct that can be used to reconfigure and build the middleware.

The middleware for individual services.