The Front Controller pattern used in MVC frameworks centralizes request handling in a single servlet.

In the MVC framework, servlets are typically used to implement the Controller component, responsible for handling user input, processing requests, and interacting with the model and view components.

In an MVC-based web application, servlets generally fit in the Controller layer. They handle user input, process requests, and coordinate communication between the model and view components.

Caching strategies, for optimizing performance, should be implemented in the Model. The Model is responsible for data access and processing, making it an appropriate place to introduce caching mechanisms.

The primary purpose of encoding user input is to prevent security vulnerabilities, such as Cross-Site Scripting (XSS), by ensuring that user input is treated as data, not executable code.

The Content-Security-Policy (CSP) header can be used to mitigate some types of XSS attacks by defining and controlling the sources from which certain types of content can be loaded.

To indicate that the content should be downloaded as a file, you can use the response.setHeader("Content-Disposition", "attachment; filename=example.txt"); method.

In the context of XSS prevention, CSP stands for Content-Security-Policy. It is a security header that helps prevent XSS attacks by specifying which content can be executed on a web page.

AngularJS automatically escapes output to prevent XSS attacks by default, helping developers build more secure web applications.

A Content Security Policy (CSP) helps prevent XSS attacks by restricting the sources of content, reducing the risk of malicious script execution from unauthorized sources.