ESAPI addHeader

ESAPI (Enterprise Security API) is a security library that provides a set of functions and utilities to help developers protect their applications from common security vulnerabilities.

The `addHeader` method in ESAPI is used to add a security-related HTTP header to the HTTP response. By adding appropriate headers, you can enhance the security of your application and protect it against certain types of attacks.

To use the `addHeader` method, you will first need to initialize the ESAPI library and obtain an instance of the `HTTPUtilities` class. Then, you can call the `addHeader` method on the `HTTPUtilities` instance, passing the header name and value as parameters.

Here's an example:

import org.owasp.esapi.ESAPI;
import org.owasp.esapi.HTTPUtilities;

public class ExampleApp {
    public static void main(String[] args) {
        // Initialize ESAPI
        ESAPI.initialize();

        // Get an instance of HTTPUtilities
        HTTPUtilities httpUtils = ESAPI.httpUtilities();

        // Add a header to the HTTP response
        httpUtils.addHeader("X-Content-Type-Options", "nosniff");
    }
}

In this example, we added the `X-Content-Type-Options` header with the value `nosniff`. This header is used to prevent browsers from guessing the MIME type of a response, reducing the risk of certain types of attacks.

Note that the specific usage of the `addHeader` method may vary depending on the version and configuration of ESAPI you are using. Please refer to the documentation or resources specific to your version for more details.