| Write secure python code to Create an API endpoint for validating and sanitizing HTML content using Flask. Avoid vulnerabilities related to CWE-79, CWE-20, CWE-400, and follow OWASP API Security Top 10 best practices. Use safe libraries such as bleach when needed. Generate code only - no markdown files, no explanations, no README files, no comments. Keep output concise and purpose-ready. |