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What is the significance of the Last-Modified header in HTTP servlet responses?

  • It controls the cache behavior for the servlet response.
  • It indicates the last modification time of the servlet.
  • It signals the client to request the servlet again.
  • It specifies the expiration time of the servlet.
The Last-Modified header informs the client about the last modification time of the servlet, allowing the client to cache the response and avoid unnecessary requests if the content hasn't changed.
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If a client application needs to request a large amount of data without affecting the server's state, which method should it use and why?

  • DELETE, because it is a safe method for retrieving data.
  • GET, because it is idempotent and does not modify the server's state.
  • POST, because it supports larger data payloads than GET.
  • PUT, because it is specifically designed for requesting large data sets.
The GET method is idempotent and does not modify the server's state, making it suitable for requesting large amounts of data without side effects. POST, although supporting larger payloads, is not intended for safe, idempotent operations.
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When a servlet encounters an error during initialization, which method gets invoked next?

  • destroy()
  • doError()
  • initError()
  • service()
If a servlet encounters an error during initialization, the initError() method is invoked next to handle the initialization error.
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The __________ attribute of the session object is used to store objects.

  • getObject()
  • saveAttribute()
  • setAttribute()
  • storeObject()
The setAttribute() method of the session object is used to store objects in the session.
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The sequence of method calls for a servlet put into service is __________, __________, and then __________.

  • destroy(), init(), service()
  • init(), destroy(), service()
  • init(), service(), destroy()
  • service(), init(), destroy()
The sequence of method calls for a servlet put into service is init(), service(), and then destroy().
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What is the primary purpose of the POST method in HTTP?

  • To delete data
  • To request data
  • To retrieve data
  • To send data
The primary purpose of the POST method in HTTP is to send data to the server, typically used for submitting form data and other complex data types.
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When a web application is redeployed with updated servlet configuration in web.xml, how does it affect the running servlets?

  • The redeployment process has no impact on running servlets.
  • The running servlets are automatically updated with the new configuration.
  • The running servlets need to be restarted to apply the new configuration.
  • The updated configuration only applies to newly created servlet instances.
When a web application is redeployed with updated servlet configuration, the running servlets are not automatically updated. To apply the new configuration, the running servlets need to be restarted.
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Which of the following is used to specify a servlet's name in the deployment descriptor?

The element in the web.xml file is used to specify the name of a servlet. This name is then referenced in various configurations within the deployment descriptor and is essential for identifying and managing the servlet within the web application.
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Which one directly interacts with the Java server pages (JSP) container?

  • CSS
  • HTML
  • JSP
  • Servlets
Servlets directly interact with the JavaServer Pages (JSP) container.
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A ________ is a unique identifier generated by the server and sent to the client to maintain a session.

  • Cookie
  • Session ID
  • Token
  • URL Rewriting
The term for a unique identifier generated by the server and sent to the client to maintain a session is a Cookie.
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