SafeLine

SafeLine is a self‑hosted web application firewall that operates as a reverse proxy, filtering and monitoring HTTP/S traffic before it reaches a web server. It blocks a broad range of attacks—including SQL injection, XSS, code injection, OS command injection, CRLF, XXE, SSRF, path traversal, and others—by applying policy‑driven inspection of request semantics. The system also offers rate limiting to mitigate DoS, brute‑force, and traffic‑surge abuse, and provides anti‑bot challenges, authentication prompts, and dynamic encryption of HTML and JavaScript to further harden applications.

The tool is aimed at developers and operators who need an on‑premise, open‑source solution for protecting public‑facing services such as e‑commerce sites, payment platforms, or any web‑based application. Its Nginx‑based architecture and wizard‑style configuration make deployment straightforward, while the intelligent detection engine, powered by semantic analysis, claims high accuracy with minimal false positives.

SafeLine is released under GPL‑3.0, requires no subscription, and includes a free tier for basic use. The project is actively maintained, with a sizable community, transparent development, and documentation that covers installation, configuration, and usage scenarios.