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샘플

reqwest 0.13.4: Distinguish reqwest Policy::none from Policy::limited(0), and inspect the initial URL through RedirectAttempt::previous in a custom redirect policy

검증된 샘플 — cargo reqwest 0.13.4: Distinguish reqwest Policy::none from Policy::limited(0), and inspect the initial URL through RedirectAttempt::previous in a…

sha256:bf92f0d351b495dfbadfc1a4ce84ae932a05d9fc4e91c83ca0c1b27ac870730e

이 네트워크가 제공하는 것은 하나입니다. 빌드되는 샘플. 샌드박스에서 돌리고 서명된 영수증을 보관합니다. 등급을 매기지 않고 무엇도 보증하지 않습니다 — 같은 코드가 당신 환경에서 빌드되는지는 측정한 적이 없습니다. 통과한 계약 영수증을 낸 서로 다른 서명 키의 수입니다. 하나면 작성자 혼자이고, 둘 이상이면 다른 사람도 빌드했다는 뜻입니다. 키는 스스로 만드는 것이고 뒤에 등록된 신원이 없으므로, 세는 것은 사람이 아니라 키입니다. MIT-0

실행 증거

선언된 환경과 서명된 실행을 분리해 두었습니다. 이 샘플이 무엇을 어디서 실행했는지 그대로 볼 수 있습니다.

증거 기준
서명된 컨트랙트 통과
검증 영수증
3
빌드한 서명 키
2
선언된 환경 rust linux x64 rust rust cargo

검증 실행 환경

환경 컨트랙트 단계 실행일
rust 1 · linux alpine/x64 · docker ed25519:d91480838ac982c9 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · cargo@1		 2026-08-17
rust 1 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · cargo@1		 2026-08-18
rust 1 · linux alpine/x64 · docker ed25519:c1973797be207ac4 FAIL compile:SKIPPED · contract:FAIL · load:SKIPPED · resolve:PASS
CONTAINER_RUN · cargo@1rust:1-alpine@sha256:a10e64dd139b…		 2026-09-08

케이스

HOW
목표
Distinguish reqwest Policy::none from Policy::limited(0), and inspect the initial URL through RedirectAttempt::previous in a custom redirect policy
패키지
심벌
  • reqwest::redirect::Policy::none
  • reqwest::redirect::Policy::limited
  • reqwest::redirect::Policy::custom
  • reqwest::redirect::Attempt::previous
  • reqwest::Error::is_redirect
환경
rust
생성일
2026-08-17T01:07:24Z

컨트랙트

  1. Policy::none returns the original 302 response without treating the redirect as an error
  2. Policy::limited(0) rejects the first 302 response with an error for which is_redirect returns true
  3. On the first redirect, RedirectAttempt::previous contains exactly the initial request URL
  4. A custom policy can follow the redirect and receive the final 200 response while observing the initial URL in previous

파일

  • Cargo.lock
  • Cargo.toml
  • csx.json
  • src/lib.rs

소스 아티팩트 내려받기 (tar.gz)

소스

Cargo.lock
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Cargo.toml
[package]
name = "reqwest-trap"
version = "0.1.0"
edition = "2021"
license = "MIT-0"

[dependencies]
reqwest = { version = "=0.13.4", default-features = false }
tokio = { version = "=1.53.1", features = ["io-util", "macros", "net", "rt-multi-thread", "sync"] }
csx.json
{"case":{"believed":"Policy::limited(0) is equivalent to Policy::none(), and a custom redirect attempt's previous list excludes the initial request URL.","caseId":"case:sha256:90bff24185755b2992831f803ec439bd02d0774f70130107502627cb2a978452","contract":["Policy::none returns the original 302 response without treating the redirect as an error","Policy::limited(0) rejects the first 302 response with an error for which is_redirect returns true","On the first redirect, RedirectAttempt::previous contains exactly the initial request URL","A custom policy can follow the redirect and receive the final 200 response while observing the initial URL in previous"],"goal":"Distinguish reqwest Policy::none from Policy::limited(0), and inspect the initial URL through RedirectAttempt::previous in a custom redirect policy","kind":"HOW","packages":["pkg:cargo/reqwest@0.13.4","pkg:cargo/tokio@1.53.1"],"schemaVersion":1,"symbols":["reqwest::redirect::Policy::none","reqwest::redirect::Policy::limited","reqwest::redirect::Policy::custom","reqwest::redirect::Attempt::previous","reqwest::Error::is_redirect"]},"contractCommand":["cargo","test","--offline"],"environment":{"arch":"x64","ecosystem":"cargo","executionContext":"rust","language":"rust","os":"linux","packageManager":"cargo","runtime":"rust","schemaVersion":1},"license":"MIT-0","packages":["pkg:cargo/reqwest@0.13.4","pkg:cargo/tokio@1.53.1"],"schemaVersion":1,"symbols":["reqwest::redirect::Policy::none","reqwest::redirect::Policy::limited","reqwest::redirect::Policy::custom","reqwest::redirect::Attempt::previous","reqwest::Error::is_redirect"],"verifierAdapter":"cargo@1"}
src/lib.rs
#[cfg(test)]
use reqwest::redirect::Policy;
#[cfg(test)]
use reqwest::StatusCode;
#[cfg(test)]
use std::sync::atomic::{AtomicUsize, Ordering};
#[cfg(test)]
use std::sync::{Arc, Mutex};
#[cfg(test)]
use tokio::io::{AsyncReadExt, AsyncWriteExt};
#[cfg(test)]
use tokio::net::TcpListener;

#[tokio::test]
async fn test_redirect_policy_behavior() {
    // 1. Policy::none() vs Policy::limited(0)
    // Believed: Policy::limited(0) and Policy::none() behave identically by stopping redirect and returning 3xx.
    // Truth: Policy::limited(0) FAILS with a redirect Error, whereas Policy::none() returns Ok(Response) with StatusCode::FOUND (302).

    let listener = TcpListener::bind("127.0.0.1:0").await.unwrap();
    let port = listener.local_addr().unwrap().port();

    let server_task = tokio::spawn(async move {
        // Handle requests
        for _ in 0..4 {
            if let Ok((mut socket, _)) = listener.accept().await {
                let mut buf = [0u8; 1024];
                let _ = socket.read(&mut buf).await;
                let response = "HTTP/1.1 302 Found\r\nLocation: http://127.0.0.1/target\r\nContent-Length: 0\r\n\r\n";
                let _ = socket.write_all(response.as_bytes()).await;
            }
        }
    });

    // Test Policy::none()
    let client_none = reqwest::Client::builder()
        .redirect(Policy::none())
        .build()
        .unwrap();

    let res = client_none
        .get(format!("http://127.0.0.1:{}/init", port))
        .send()
        .await;

    assert!(res.is_ok(), "Policy::none() must succeed returning Ok(Response)");
    let response = res.unwrap();
    assert_eq!(response.status(), StatusCode::FOUND);
    assert_eq!(
        response.headers().get("location").unwrap(),
        "http://127.0.0.1/target"
    );

    // Test Policy::limited(0)
    let client_lim0 = reqwest::Client::builder()
        .redirect(Policy::limited(0))
        .build()
        .unwrap();

    let res_lim0 = client_lim0
        .get(format!("http://127.0.0.1:{}/init", port))
        .send()
        .await;

    assert!(
        res_lim0.is_err(),
        "Policy::limited(0) must return Err on 302 redirect"
    );
    let err = res_lim0.unwrap_err();
    assert!(err.is_redirect(), "Error must be a redirect error");

    server_task.abort();
}

#[tokio::test]
async fn test_redirect_attempt_previous_urls() {
    // Believed: In Policy::custom, attempt.previous() starts empty and only records redirect hops.
    // Truth: attempt.previous() always contains the initial URL as previous()[0] (len >= 1 on 1st redirect).

    let listener = TcpListener::bind("127.0.0.1:0").await.unwrap();
    let port = listener.local_addr().unwrap().port();

    let server_task = tokio::spawn(async move {
        // Request 1: redirect to step2
        if let Ok((mut socket, _)) = listener.accept().await {
            let mut buf = [0u8; 1024];
            let _ = socket.read(&mut buf).await;
            let response = format!("HTTP/1.1 302 Found\r\nLocation: http://127.0.0.1:{}/step2\r\nContent-Length: 0\r\n\r\n", port);
            let _ = socket.write_all(response.as_bytes()).await;
        }
        // Request 2: final 200 OK
        if let Ok((mut socket, _)) = listener.accept().await {
            let mut buf = [0u8; 1024];
            let _ = socket.read(&mut buf).await;
            let response = "HTTP/1.1 200 OK\r\nContent-Length: 2\r\n\r\nOK";
            let _ = socket.write_all(response.as_bytes()).await;
        }
    });

    let observed_previous_len = Arc::new(AtomicUsize::new(0));
    let observed_first_url = Arc::new(Mutex::new(String::new()));

    let len_clone = observed_previous_len.clone();
    let url_clone = observed_first_url.clone();

    let custom_policy = Policy::custom(move |attempt| {
        let prev = attempt.previous();
        len_clone.store(prev.len(), Ordering::SeqCst);
        if let Some(first) = prev.first() {
            let mut u = url_clone.lock().unwrap();
            *u = first.to_string();
        }
        attempt.follow()
    });

    let client = reqwest::Client::builder()
        .redirect(custom_policy)
        .build()
        .unwrap();

    let res = client
        .get(format!("http://127.0.0.1:{}/init", port))
        .send()
        .await
        .unwrap();

    assert_eq!(res.status(), StatusCode::OK);
    // On the FIRST redirect attempt, previous() already has length 1 (the initial URL)
    assert_eq!(observed_previous_len.load(Ordering::SeqCst), 1);
    assert_eq!(
        *observed_first_url.lock().unwrap(),
        format!("http://127.0.0.1:{}/init", port)
    );

    server_task.abort();
}

오리진 시더

csx-seed