Podcast
Questions and Answers
What is the primary purpose of short polling, long polling, and web sockets?
What is the primary purpose of short polling, long polling, and web sockets?
- To manage server infrastructure.
- To design user interfaces.
- To encrypt data during transmission.
- To retrieve data from a resource. (correct)
In the context of data retrieval, what does 'client' typically refer to?
In the context of data retrieval, what does 'client' typically refer to?
- An operating system.
- A JavaScript application hosting a front end. (correct)
- A network router.
- A database server.
In short polling, what happens after a client receives a response from the resource server?
In short polling, what happens after a client receives a response from the resource server?
- It switches to a different server for subsequent requests.
- It immediately closes the connection.
- It waits for a short interval and then repeats the request. (correct)
- It sends a confirmation message.
What is a major disadvantage of short polling?
What is a major disadvantage of short polling?
How does long polling differ from short polling?
How does long polling differ from short polling?
In long polling, what does the resource server do if it does not have data available when the client makes a request?
In long polling, what does the resource server do if it does not have data available when the client makes a request?
What is an advantage of long polling over short polling?
What is an advantage of long polling over short polling?
In the context of long polling, what happens once the resource server sends data back to the client?
In the context of long polling, what happens once the resource server sends data back to the client?
Which method ties up a connection between the client and resource?
Which method ties up a connection between the client and resource?
What does 'R' stand for in the examples?
What does 'R' stand for in the examples?
Flashcards
Short Polling
Short Polling
A technique where a client repeatedly makes requests to a server to retrieve data at short intervals.
Long Polling
Long Polling
A technique where a client makes a request to a server, and the server holds the connection open until data is available or a timeout occurs.
Short Polling Process
Short Polling Process
The client continuously makes calls to the resource server in an attempt to retrieve data. The resource server can respond with an empty payload or with a data object. Once the client receives data, it waits for a short interval and repeats the process.
Long Polling Benefits
Long Polling Benefits
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Study Notes
- Short polling, long polling, and web sockets are techniques to retrieve data.
Short Polling
- Involves a client (e.g., JavaScript front end) and a resource (e.g., Node.js back end).
- The client repeatedly sends requests to the resource server to retrieve data.
- The resource server responds with either an empty payload or a data object.
- After receiving a response, the client waits for a short interval (e.g., 3 seconds) and repeats the process.
- Short polling is inefficient due to continuous resource usage on both the client and server sides.
Long Polling
- Also involves a client and a resource.
- The client sends 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 becomes available and then responds.
- Long polling avoids wasting cycles between the client and the resource.
- Only one call is made, and the resource responds when data arrives.
- It can tie up a connection between the client and the resource.
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Description
Explore short polling, and long polling techniques for data retrieval. Understand how clients and resources interact in each method. Compare the efficiency of continuous requests versus waiting for data availability.
