reqwest-proxy-pool

Proxy pool middleware implementation for reqwest-middleware.

Features

✨ Comprehensive Proxy Support

• Automatic parsing of free SOCKS5/SOCKS5H proxies from multiple sources
• Per-host proxy pools with independent health-check policies

⚡ Intelligent Proxy Management

• Multiple proxy selection strategies (FastestResponse, MostReliable, RoundRobin, Random)
• Per-proxy minimum request interval to avoid bans
• Automatic retry mechanism for failed requests
• Retry strategy control (DefaultSelection / NewProxyOnRetry)
• Custom response classifier for business-level proxy health (anti-bot/captcha detection)

🔧 Easy Configuration

• Simple builder pattern for configuration
• Seamless integration with reqwest middleware stack

Quickstart

Installation

Add to your Cargo.toml:

[dependencies]
reqwest = "0.13"
reqwest-proxy-pool = "0.3"
reqwest-middleware = "0.5"
tokio = { version = "1", features = ["full"] }

Usage

use reqwest_middleware::ClientBuilder;
use reqwest_proxy_pool::{
    HostConfig, ProxyPoolConfig, ProxyPoolMiddleware, ProxyResponseVerdict,
    ProxySelectionStrategy, ResponseClassifier, RetryStrategy,
};
use std::time::Duration;

struct CaptchaDetector;

impl ResponseClassifier for CaptchaDetector {
    fn classify(&self, response: &reqwest::Response) -> ProxyResponseVerdict {
        match response.status().as_u16() {
            403 | 429 => ProxyResponseVerdict::ProxyBlocked,
            500..=599 => ProxyResponseVerdict::Passthrough,
            _ => ProxyResponseVerdict::Success,
        }
    }
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let api_host = HostConfig::builder("httpbin.org")
        .primary(true)
        .health_check_timeout(Duration::from_secs(5))
        .health_check_url("https://httpbin.org/ip")
        .retry_count(2)
        .retry_strategy(RetryStrategy::NewProxyOnRetry)
        .selection_strategy(ProxySelectionStrategy::FastestResponse)
        .min_request_interval_ms(500)
        .response_classifier(CaptchaDetector)
        .danger_accept_invalid_certs(true)
        .build();

    let static_host = HostConfig::builder("example.com")
        .health_check_url("https://example.com")
        .retry_count(1)
        .selection_strategy(ProxySelectionStrategy::Random)
        .min_request_interval_ms(800)
        .build();

    let config = ProxyPoolConfig::builder()
        // Shared proxy source list for all host pools.
        .sources(vec![
            "https://cdn.jsdelivr.net/gh/dpangestuw/Free-Proxy@main/socks5_proxies.txt",
            "https://cdn.jsdelivr.net/gh/proxifly/free-proxy-list@main/proxies/protocols/socks5/data.txt",
        ])
        // One host config = one dedicated pool.
        .hosts(vec![api_host, static_host])
        .build();

    let proxy_pool = ProxyPoolMiddleware::new(config).await?;

    let client = ClientBuilder::new(reqwest::Client::new())
        .with(proxy_pool)
        .build();

    let response = client.get("https://httpbin.org/ip").send().await?;
    println!("Status: {}", response.status());
    println!("Response: {}", response.text().await?);

    Ok(())
}

Configuration Options

ProxyPoolConfig:

HostConfig:

Host-Based Routing (Multiple Pools)

use reqwest_proxy_pool::{HostConfig, ProxyPoolConfig, ProxyPoolMiddleware};

let api_host = HostConfig::builder("api.example.com").build();
let web_host = HostConfig::builder("www.example.com").primary(true).build();

let config = ProxyPoolConfig::builder()
    .sources(vec!["https://example.com/shared-proxies.txt"])
    .hosts(vec![api_host, web_host])
    .build();

let middleware = ProxyPoolMiddleware::new(config).await?;

Routing Rules

1. Request host matches a configured HostConfig.host -> use that host pool.
2. Request host does not match -> use the unique HostConfig with primary(true).

primary=true is required for exactly one host.

Migration (0.2 -> 0.3)

• ProxyPoolConfig (single pool config) -> split into:
  • top-level ProxyPoolConfig { sources, hosts }
  • per-host HostConfig
• max_requests_per_second -> min_request_interval_ms
• retry_strategy added:
  • DefaultSelection: previous behavior
  • NewProxyOnRetry: force different proxy on retries

Example migration:

// v0.2
// ProxyPoolConfig::builder().health_check_url(...).max_requests_per_second(3.0)

// v0.3
let host = HostConfig::builder("target.example.com")
    .primary(true)
    .health_check_url("https://target.example.com/health")
    .min_request_interval_ms(333)
    .build();
let config = ProxyPoolConfig::builder()
    .sources(vec!["https://.../socks5.txt"])
    .add_host(host)
    .build();

License