Which HTTP status code is typically sent by an HTTP servlet to indicate a successful response?
- 200 OK
- 302 Found
- 404 Not Found
- 500 Internal Server Error
The HTTP status code 200 OK is typically sent by an HTTP servlet to indicate a successful response. This status code signals that the request has been successfully processed, and the server is returning the requested resource.
To retrieve an AsyncContext object in a servlet, you use the __________ method of the HttpServletRequest.
- getAsyncContext()
- initAsync()
- retrieveAsync()
- startAsync()
To retrieve an AsyncContext object in a servlet, you use the getAsyncContext() method of the HttpServletRequest.
In asynchronous servlets, the __________ method of AsyncContext sends the response to the client.
- complete()
- finish()
- getResponseWriter()
- sendResponse()
In asynchronous servlets, the complete() method of AsyncContext is used to send the response to the client.
To add an AsyncListener to an AsyncContext, use the __________ method.
- addAsyncListener()
- addListener()
- attachListener()
- registerListener()
To add an AsyncListener to an AsyncContext, use the addAsyncListener() method.
The __________ method of AsyncContext allows for manually controlling the timeout of an asynchronous operation.
- adjustTimeout()
- controlTimeout()
- setAsyncTimeout()
- setTimeout()
The setAsyncTimeout() method of AsyncContext allows for manually controlling the timeout of an asynchronous operation.
Consider a servlet that initiates a long-running task asynchronously. What happens to the request thread during this task?
- The request thread is blocked until the asynchronous task completes.
- The request thread is free to handle other requests.
- The request thread is paused indefinitely.
- The request thread is terminated.
In an asynchronous operation, the request thread is freed to handle other requests while the long-running task proceeds independently.
In a situation where multiple asynchronous tasks are initiated by a servlet, how is the completion of these tasks managed?
- Each asynchronous task manages its completion independently.
- The servlet prioritizes tasks based on their initiation order.
- The servlet waits for all tasks to complete before proceeding.
- The tasks are completed in a random order.
Each asynchronous task manages its completion independently, allowing them to finish in parallel without waiting for others to complete.
What must be done to ensure the safe and correct download of files with different character encodings?
- Encode files as ASCII
- Set the character encoding in the response header
- Use a fixed character encoding
- Use the default character encoding
To ensure the safe and correct download of files with different character encodings, set the character encoding in the response header using response.setCharacterEncoding().
What are the security concerns to consider while implementing file upload in servlets?
- All of the above
- Checking file size
- Securing file storage location
- Validating file types
When implementing file upload in servlets, it's crucial to consider security concerns such as validating file types, checking file size, and securing the file storage location to prevent vulnerabilities.
How can a servlet efficiently handle large file uploads without running out of memory?
- Compress the file
- Increase heap memory
- Split the file into chunks
- Use streaming API
To handle large file uploads efficiently, a servlet can use streaming APIs to process the file in smaller chunks, avoiding memory overflow. Increasing heap memory may not be a scalable solution, and splitting the file into chunks is a better approach.