6 releases (breaking)

0.5.0 Oct 3, 2021
0.4.0 Jul 28, 2021
0.3.0 May 10, 2021
0.2.0 Apr 3, 2021
0.1.1 Dec 6, 2020

#90 in Debugging

46 downloads per month


230 lines


OpenTelemetry integration for Surf

Add OpenTelemetry tracing support to your Surf clients. Be part of the new observability movement!


  • It is heavily inspired by opentelemetry-tide crate; surf and tide share very similar middleware structure. Thank you, dear @http-rs folks! 🙇🏻‍♂️
  • It only implements very basic request tracing on the middleware layer. If something is missing, please open an issue and describe your desired feature or create a PR with a change.
  • It can record http request/response life cycle events when used with isahc and its metrics feature enabled.
  • You probably do not want to use it in production. 🤷

How to use

# Run jaeger in background
docker run -d \
  -p6831:6831/udp -p6832:6832/udp -p16686:16686 -p14268:14268 \

# Run simple client example with tracing middleware
cargo run --example simple

# Run metrics client example (uses isahc with metrics enabled)
cargo run --example metrics --features isahc-metrics

# Open browser and view the traces
firefox http://localhost:16686/

example jaeger trace

Code example


async-std = { version = "1.10", features = ["attributes"] }
opentelemetry = { version = "0.16", features = ["rt-async-std"] }
opentelemetry-jaeger = { version = "0.15", features = ["rt-async-std"] }
opentelemetry-surf = "0.5"


async fn main() -> surf::Result<()> {
    let tracer = opentelemetry_jaeger::new_pipeline().install_batch(opentelemetry::runtime::AsyncStd)?;
    let otel_mw = opentelemetry_surf::OpenTelemetryTracingMiddleware::new(tracer);
    let client = surf::client().with(otel_mw);
    let res = client.get("https://httpbin.org/get").await?;


Cargo Features

flag description
isahc-metrics enables more details when using a custom ishac client configuration, see examples/client/metrics.rs for details


This crate uses #![forbid(unsafe_code)] to ensure everything is implemented in 100% Safe Rust.


Licensed under either of Apache License, Version 2.0 or MIT license at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.


~276K SLoC