What is the Content Security Policy for a .NET 4.8 Framework Web Application?

The Content Security Policy (CSP) is a security mechanism that helps protect web applications from various types of attacks, including cross-site scripting (XSS) and data injection. For a .NET 4.8 Framework web application, implementing a CSP involves specifying a set of directives that tell the browser what sources of content are allowed to be loaded.

Here's a breakdown of key concepts and how to apply them to a .NET 4.8 application:

1. What is CSP?

- CSP is a HTTP response header that web servers send to clients (browsers). It specifies a policy that allows the browser to load resources only from trusted sources.

2. Implementing CSP in a .NET 4.8 Framework Application:

- You typically add the CSP header using custom code or configurations in the application's web.config file or Global.asax. The header is then sent with each HTTP response.

3. Common CSP Directives:

- `default-src`: Sets the default policy for all resource types if a specific directive isn’t provided. For example, `default-src 'self'` allows resources from the same origin by default.

- `script-src`: Defines which sources JavaScript can be loaded from. Example: `script-src 'self' 'unsafe-inline' https://cdn.example.com;`.

- `style-src`: Specifies valid sources for stylesheets. Example: `style-src 'self' https://fonts.googleapis.com;`

- `img-src`: Determines allowed sources for images. Example: `img-src 'self' data: https://images.example.com;`

- `connect-src`: Defines valid endpoints that can be requested with `XMLHttpRequest`, `Fetch`, `WebSocket`. Example: `connect-src 'self' https://api.example.com;`

- `font-src`: Valid sources for font resources. Example: `font-src 'self' https://fonts.gstatic.com;`.

- `object-src`: Controls locations from which `