Podcast
Questions and Answers
In short polling, how frequently does a client request data from a resource?
In short polling, how frequently does a client request data from a resource?
- Only once at the beginning of a session
- Only when the resource has new data to send
- Continuously at set intervals (correct)
- Upon user interaction only
What is a potential disadvantage of short polling?
What is a potential disadvantage of short polling?
- Reduced server load
- Immediate data delivery
- Efficient use of network resources
- Wasted resources due to continuous requests (correct)
In long polling, what happens when the resource server does not have data immediately available when a client requests it?
In long polling, what happens when the resource server does not have data immediately available when a client requests it?
- The server sends a 'data not available' message and closes the connection.
- The server closes the connection and the client must reconnect.
- The server holds the connection open until data becomes available. (correct)
- The server immediately sends an empty response.
How does long polling reduce wasted cycles compared to short polling?
How does long polling reduce wasted cycles compared to short polling?
In both short polling and long polling, what initiates the data retrieval process?
In both short polling and long polling, what initiates the data retrieval process?
What is the primary purpose of both short polling and long polling techniques?
What is the primary purpose of both short polling and long polling techniques?
Which of the following best describes the client in the context of polling?
Which of the following best describes the client in the context of polling?
Which of the following best describes the resource in the context of polling?
Which of the following best describes the resource in the context of polling?
In short polling, what type of response might a resource server send if there is no new data?
In short polling, what type of response might a resource server send if there is no new data?
What is the main difference in how connections are handled between short polling and long polling?
What is the main difference in how connections are handled between short polling and long polling?
Flashcards
Short Polling
Short Polling
A technique where a client repeatedly queries a server for data at short intervals.
Long Polling
Long Polling
A technique where the server holds the client's request open until new data is available, then responds.
Polling
Polling
A method for clients to retrieve data.
Study Notes
- Short polling, long polling, and WebSockets are techniques to retrieve data.
Short Polling
- A client, like a JavaScript front end, continuously makes calls to a resource server, like a Node.js back end, to retrieve data.
- The resource server responds with either an empty payload or a data object in its body.
- After receiving the response, the client waits for a short interval, like 3 seconds, and repeats the process.
- Short polling is inefficient because the client continuously uses resources on both its side and the resource server's side.
Long Polling
- The client makes a request to the resource.
- If the resource has data, it responds immediately.
- If the resource doesn't have data, it keeps the connection open until data arrives.
- When data arrives, the resource sends it to the client over the existing connection.
- Long polling avoids wasting cycles between the client and the resource.
- It keeps the connection open until data does arrive its doorstep and it'll return that data back to the client.
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Description
Explanation of Short polling, long polling, and WebSockets techniques to retrieve data. Short polling involves continuous client calls, while long polling keeps the connection open until data arrives.
