How would a servlet handle different initialization parameters for different deployment environments?
- Create separate servlets for each environment
- Leverage servlet annotations for environment-specific settings
- Use a single set of parameters for all environments
- Use conditional logic within the servlet
Servlets can handle different initialization parameters for different deployment environments by using conditional logic within the servlet. This allows the servlet to adapt its behavior based on the specific configuration for each environment.
What is the role of the Secure flag in a cookie?
- Enables third-party access to the cookie
- Ensures the cookie is encrypted
- Indicates the cookie is safe for cross-site requests
- Restricts the cookie to HTTPS connections
The Secure flag in a cookie indicates that the cookie should only be sent over secure, encrypted connections (HTTPS). This enhances the security of the cookie by preventing it from being transmitted over unsecured HTTP connections.
HTTP persistent connections are managed using the _________ header in servlet responses.
- Connection
- Keep-Alive
- Persistent
- Session
HTTP persistent connections are managed using the Keep-Alive header in servlet responses.
The __________ method is generally used for fetching data where the request does not affect server state.
- DELETE
- GET
- POST
- PUT
The GET method is generally used for fetching data where the request does not affect server state. It is considered idempotent.
To access all initialization parameters, the method ________ can be used, which returns an _________.
- getInitParameterNames(), Enumeration
- getInitParameters(), ArrayList
- getParameters(), Array
- getServletContext(), Enumeration
The correct method is getInitParameterNames(), which returns an Enumeration containing the names of the servlet's initialization parameters.
What is the best approach to maintain user sessions in a distributed web application environment?
- Database Session
- HTTP Session
- Hidden Form Fields
- URL Rewriting
The best approach to maintain user sessions in a distributed web application environment is to use HTTP Session. This allows for centralized session management across multiple servers.
Which method in a filter is responsible for cleaning up resources when the filter is taken out of service?
- destroy()
- doFilter()
- filterInit()
- init()
The destroy() method is responsible for cleaning up resources when the filter is taken out of service.
When designing a servlet that handles sensitive data, which header should be set to secure the response?
- Access-Control-Allow-Origin, setHeader()
- Strict-Transport-Security, setHeader()
- X-Content-Type-Options, setHeader()
- X-Frame-Options, setHeader()
To secure the response when handling sensitive data, the Strict-Transport-Security header should be set using the setHeader() method in the HttpServletResponse.
When multiple filters are defined, in what order are they executed?
- Alphabetical order
- Order of declaration in web.xml
- Order specified in filter-mapping
- Random order
Filters are executed in the order of declaration in the web.xml file. The order can be important when one filter's output is used as input to another filter in the chain.
How can a filter pass control to the next entity in the filter chain?
- chain.continueFiltering(request, response)
- chain.doFilter(request, response)
- filterChain.doFilter(request, response)
- filterChain.passControl(request, response)
To pass control to the next entity in the filter chain, the correct method is chain.doFilter(request, response). It invokes the next filter or the servlet in the chain.