Bug Report
Version
0.6.8
Platform
Linux
Description
I'm using tower-http TraceLayer to log axum requests, however, sometime the log doesn't have any span attached to it, for example:
server-1 | 2026-03-07T06:47:27.963867Z DEBUG tower_http::trace::on_request: started processing request
server-1 | 2026-03-07T06:47:27.963959Z DEBUG tower_http::trace::on_response: finished processing request latency=0 ms status=200
server-1 | 2026-03-07T06:47:28.375252Z DEBUG tower_http::trace::on_request: started processing request
server-1 | 2026-03-07T06:47:51.871866Z DEBUG request{method=OPTIONS uri=/v1/game/me/currency/data/balance version=HTTP/1.1}: tower_http::trace::on_request: started processing request
server-1 | 2026-03-07T06:47:51.872013Z DEBUG request{method=OPTIONS uri=/v1/game/me/currency/data/balance version=HTTP/1.1}: tower_http::trace::on_response: finished processing request latency=0 ms status=200
server-1 | 2026-03-07T06:47:53.819640Z DEBUG request{method=GET uri=/v1/game/me/currency/data/balance version=HTTP/1.1}: tower_http::trace::on_request: started processing request
server-1 | 2026-03-07T06:47:54.477762Z DEBUG request{method=OPTIONS uri=/v1/game/me/casual/energy_balance version=HTTP/1.1}: tower_http::trace::on_request: started processing request
server-1 | 2026-03-07T06:47:54.477868Z DEBUG request{method=OPTIONS uri=/v1/game/me/casual/energy_balance version=HTTP/1.1}: tower_http::trace::on_response: finished processing request latency=0 ms status=200
server-1 | 2026-03-07T06:47:55.132684Z DEBUG request{method=GET uri=/v1/game/me/casual/energy_balance version=HTTP/1.1}: tower_http::trace::on_request: started processing request
server-1 | 2026-03-07T06:48:17.030890Z DEBUG tower_http::trace::on_request: started processing request
server-1 | 2026-03-07T06:48:17.030990Z DEBUG tower_http::trace::on_response: finished processing request latency=0 ms status=200
server-1 | 2026-03-07T06:48:17.283262Z DEBUG request{method=POST uri=/v1/game/me/run/start version=HTTP/1.1}: tower_http::trace::on_request: started processing request
server-1 | 2026-03-07T06:54:21.256843Z DEBUG tower_http::trace::on_request: started processing request
server-1 | 2026-03-07T06:54:22.811286Z DEBUG request{method=GET uri=/ version=HTTP/1.1}: tower_http::trace::on_request: started processing request
Lines like this:
server-1 | 2026-03-07T06:48:17.030890Z DEBUG tower_http::trace::on_request: started processing request
server-1 | 2026-03-07T06:48:17.030990Z DEBUG tower_http::trace::on_response: finished processing request latency=0 ms status=200
This is how I configure logging:
pub mod log {
use std::time::Duration;
use axum::http::StatusCode;
use tower_http::trace::{DefaultOnResponse, OnResponse, TraceLayer};
use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt, EnvFilter, Layer};
#[derive(Clone)]
pub struct OnResponseImpl<T> {
inner: T,
}
impl<B, T> OnResponse<B> for OnResponseImpl<T>
where
T: OnResponse<B>,
{
fn on_response(
self,
response: &axum::http::Response<B>,
latency: Duration,
span: &tracing::Span,
) {
if response.status() != StatusCode::NOT_FOUND {
self.inner.on_response(response, latency, span)
}
}
}
pub fn init_tracing() {
tracing_subscriber::registry()
.with(tracing_subscriber::fmt::layer().with_filter(
EnvFilter::from_default_env().add_directive("tower_http=debug".parse().unwrap()),
))
.init();
}
pub fn layer() -> TraceLayer<
tower_http::classify::SharedClassifier<tower_http::classify::ServerErrorsAsFailures>,
tower_http::trace::DefaultMakeSpan,
tower_http::trace::DefaultOnRequest,
OnResponseImpl<DefaultOnResponse>,
> {
TraceLayer::new_for_http().on_response(OnResponseImpl {
inner: DefaultOnResponse::new(),
})
}
}I have a custom OnResponseImpl to filter out the 404 responses.
Bug Report
Version
0.6.8
Platform
Linux
Description
I'm using tower-http TraceLayer to log axum requests, however, sometime the log doesn't have any span attached to it, for example:
Lines like this:
This is how I configure logging:
I have a custom OnResponseImpl to filter out the 404 responses.