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DoKit achieves non‑intrusive first‑line JavaScript injection for Android WebView by intercepting HTML requests, parsing with Jsoup to prepend a script tag, and employing ASM bytecode hooks to wrap WebViewClient, ensuring the OMMC feature reliably controls multiple devices on H5 pages.
By combining WKURLSchemeHandler with injected JavaScript that captures request bodies, forwards them via WKScriptMessageHandler, and synchronizes cookies and redirects, this approach overcomes iOS WKWebView’s native limitations, offering a stable, per‑webview interception method superior to NSURLProtocol for offline‑package loading.
This article explains how to set up a Linux Squid proxy that injects malicious JavaScript into every served script, captures user input, forces persistent caching, and outlines the severe security risks such as credential theft, financial fraud, DDoS abuse, and full browsing surveillance.