A crate implementing a wrapper around reqwest to allow for client middleware chains.
This crate provides functionality for building and running middleware but no middleware implementations. This repository also contains a couple of useful concrete middleware crates:
reqwest-retry
: retry failed requests.reqwest-tracing
:tracing
integration, optional opentelemetry support.
Note about browser support: automated tests targeting wasm are disabled. The crate may work with wasm but wasm support is unmaintained. PRs improving wasm are still welcome but you'd need to reintroduce the tests and get them passing before we'd merge it (see TrueLayer#105).
The reqwest-middleware
client exposes the same interface as a plain reqwest
client, but
ClientBuilder
exposes functionality to attach middleware:
# Cargo.toml
# ...
[dependencies]
reqwest = "0.11"
reqwest-middleware = "0.1.6"
reqwest-retry = "0.1.5"
reqwest-tracing = "0.2.3"
tokio = { version = "1.12.0", features = ["macros", "rt-multi-thread"] }
use reqwest_middleware::{ClientBuilder, ClientWithMiddleware};
use reqwest_retry::{RetryTransientMiddleware, policies::ExponentialBackoff};
use reqwest_tracing::TracingMiddleware;
#[tokio::main]
async fn main() {
// Retry up to 3 times with increasing intervals between attempts.
let retry_policy = ExponentialBackoff::builder().build_with_max_retries(3);
let client = ClientBuilder::new(reqwest::Client::new())
// Trace HTTP requests. See the tracing crate to make use of these traces.
.with(TracingMiddleware::default())
// Retry failed requests.
.with(RetryTransientMiddleware::new_with_policy(retry_policy))
.build();
run(client).await;
}
async fn run(client: ClientWithMiddleware) {
client
.get("https://truelayer.com")
.header("foo", "bar")
.send()
.await
.unwrap();
}
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.
The following third-party middleware use reqwest-middleware
:
reqwest-conditional-middleware
- Per-request basis middlewarehttp-cache
- HTTP caching rulesreqwest-cache
- HTTP cachingaliri_reqwest
- Background token management and renewalhttp-signature-normalization-reqwest
(not free software) - HTTP Signaturesreqwest-chain
- Apply custom criteria to any reqwest response, deciding when and how to retry.