Podcast
Questions and Answers
In short polling, how does the client interact with the resource?
In short polling, how does the client interact with the resource?
- The client makes continuous requests to the resource at specified intervals. (correct)
- The client only requests data when the resource has updates.
- The client waits for the resource to push updates without making requests.
- The client maintains an open connection for continuous data flow.
What happens in long polling if the resource doesn't have data immediately available?
What happens in long polling if the resource doesn't have data immediately available?
- The resource keeps the connection open until data is available. (correct)
- The resource immediately responds with an empty dataset.
- The resource closes the connection and the client must reconnect.
- The resource sends a notification to the client to check back later.
Which of the following best describes the communication model of web sockets?
Which of the following best describes the communication model of web sockets?
- A series of independent requests and immediate responses.
- A persistent, bidirectional connection between client and resource. (correct)
- Resource only sends data when specifically requested by the client.
- Client requests data at short intervals.
In which scenario is short polling considered acceptable?
In which scenario is short polling considered acceptable?
When is long polling generally a good choice for data transfer?
When is long polling generally a good choice for data transfer?
For what type of application is using web sockets a good choice?
For what type of application is using web sockets a good choice?
Which method is least efficient due to constant connection requests?
Which method is least efficient due to constant connection requests?
What is a key advantage of using web sockets over long polling?
What is a key advantage of using web sockets over long polling?
In long polling, what initiates the data request?
In long polling, what initiates the data request?
Which protocol maintains a continuous connection, enabling push functionality?
Which protocol maintains a continuous connection, enabling push functionality?
Flashcards
Short Polling
Short Polling
Client repeatedly makes calls to the resource at set intervals, resource responds every time, repeating on short cycles.
Long Polling
Long Polling
Client initiates a request; the server holds the connection open until data is ready, then responds. If no data, it waits.
WebSockets
WebSockets
Persistent connection between client and resource, allowing bidirectional data flow. Resource pushes updates as they occur.
When to use Short Polling
When to use Short Polling
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When to use Long Polling
When to use Long Polling
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When to use WebSockets
When to use WebSockets
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Study Notes
- Web sockets are a variation of long polling for client-resource communication.
- Web sockets establish a continuous connection "highway" between the client and resource.
- The resource server has full control and can push data to the client whenever it wants.
- Web sockets create a bidirectional relationship, enabling free data flow between client and resource.
- Resources push data as needed but a connection is maintained at all times in web sockets.
Short Polling
- The client continuously sends requests to the resource at specified intervals and the resource responds every time.
- This process repeats on very short cycles.
- Short polling is rarely a good choice for regular data transfer.
- Acceptable for quick prototyping or when long delays exist between network calls.
Long Polling
- The client makes a request to the resource, and if no data is available, the connection remains open until the data is available.
- If the resource has data, it responds immediately.
- Long polling works well with low traffic but scales quickly when traffic increases.
- Generally a good choice in most circumstances.
Web Sockets Use Cases
- Suitable for applications needing very low latency between client and resource.
- Useful for webchat applications with many users where messages need to be pushed from the server.
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Description
Explore web sockets, short polling, and long polling techniques for client-resource communication. Web sockets maintain a continuous bidirectional connection, while short polling involves frequent client requests. Long polling keeps the connection open until data is available, offering a more efficient approach.
