What is the primary purpose of using HTTPS instead of HTTP in servlets?
- Enhanced Logging
- Faster Performance
- Improved Security
- Simpler Implementation
The primary purpose of using HTTPS in servlets is to provide improved security by encrypting the data transmitted between the client and server, ensuring secure communication.
What is the correct way to set a response header to prevent caching of servlet responses?
- setCacheControl("no-cache")
- setHeader("Cache-Control", "no-store")
- setHeader("Expires", "0")
- setHeader("Pragma", "no-cache")
The correct way to set a response header to prevent caching is by using setHeader("Cache-Control", "no-store"), which instructs the browser not to store the response in its cache.
In a case where file uploads are taking too long, what are potential causes and solutions?
- Large file size
- Slow network connection
- Insufficient server resources
- All of the above
Potential causes for slow file uploads can include a large file size, a slow network connection, or insufficient server resources. Addressing all these factors collectively (option 4) can help optimize file upload performance.
Describe a scenario where file download in a servlet might fail and how to address it.
- Incomplete file on the server
- Incorrect file path in the servlet configuration
- Insufficient permissions to read the file
- All of the above
Various factors such as an incomplete file on the server, an incorrect file path in the servlet configuration, or insufficient permissions can lead to file download failure. Addressing all these issues collectively (option 4) provides a comprehensive solution to potential download failures.
A servlet is configured to allow only specific file types for upload. What strategies should be implemented to ensure this?
- Rely on the web browser for file type validation
- Use a third-party library for file type validation
- Validate file types on the client side
- Validate file types on the server side
Validating file types on the server side is a more secure approach to ensure that only specific file types are allowed for upload. Relying solely on client-side validation can be bypassed, so it's not recommended. Using a third-party library can also provide robust validation.
To manage memory efficiently during file upload, using a __________ approach is recommended.
- buffering
- random access
- sequential
- streaming
To manage memory efficiently during file upload, a streaming approach is recommended, allowing the servlet to process the file in chunks rather than loading the entire file into memory.
Role-based authorization in servlets is often implemented using the _________ descriptor.
- authorization.xml
- roles.xml
- servlet.xml
- web.xml
Role-based authorization in servlets is often implemented using the web.xml descriptor, where roles and corresponding access rights are defined to control access to servlet resources based on user roles.
The __________ method is essential for managing user logouts in secure web applications.
- closeSession(), terminate()
- destroySession()
- endSession(), finalize()
- logout()
The logout() method is essential for managing user logouts in secure web applications. It typically involves invalidating the user's session to ensure they are logged out securely.
To secure a servlet, developers often use _________ combined with _________ to restrict access.
- authentication, authorization
- encryption, decryption
- firewalls, intrusion detection
- session management, cryptography
Developers often use authentication combined with authorization to secure a servlet. Authentication verifies the user's identity, while authorization determines the user's access rights.
A secure servlet session is typically identified through a unique _________.
- URL parameter
- authentication token
- cookie
- session ID
A secure servlet session is typically identified through a unique session ID assigned to each user during their session.
The __________ API in Java EE is used for declarative security in web applications.
- Java EE Security
- Java Security
- Servlet Security
- Web Security
The Java EE Security API is used for declarative security in web applications, allowing developers to specify security constraints.
In servlets, the _________ mechanism is used to encrypt data transmitted over the network.
- HTTP
- HTTPS
- SSL/TLS
- TCP
In servlets, the SSL/TLS mechanism is used to encrypt data transmitted over the network, providing a secure communication channel.