v2.48.2

anthropics/anthropic-tokenizer-typescriptv2.48.2Mar 25, 2026by github-actions[bot]

AI Summary

This release introduces parallel crawl backends, allowing users to race alternative browser engines alongside their primary crawl and select the best HTML result. The feature adds significant flexibility and robustness to web crawling operations.

Key Highlights

Parallel crawl backends with multiple browser engine support
Race alternative browser engines to select best HTML
Zero overhead when disabled
Anti-fingerprint jitter and auto-disable on failures
Full network interception parity with Chrome

New Features

lightpanda backend support
servo backend support
parallel_backends_full feature
Custom backends via BackendEngine::Custom
Custom quality validator
backend_source tracking (primary | lightpanda | servo | custom)

Full Release Notes

Race alternative browser engines alongside your primary crawl. Best HTML wins.

```rust
use spider::configuration::{BackendEndpoint, BackendEngine, ParallelBackendsConfig};

let mut website = Website::new("https://example.com");
website.configuration.parallel_backends = Some(ParallelBackendsConfig {
    backends: vec![BackendEndpoint {
        engine: BackendEngine::LightPanda,
        endpoint: Some("ws://127.0.0.1:9222".to_string()),
        binary_path: None,
        protocol: None,
    }],
    ..Default::default()
});
website.crawl().await;
// page.backend_source → "primary" | "lightpanda" | "servo" | "custom"
```

Features: `lightpanda`, `servo`, `parallel_backends_full`, custom backends via `BackendEngine::Custom`.

Zero overhead when disabled, anti-fingerprint jitter, auto-disable on failures, custom quality validator, full network interception parity with Chrome.