Podcast
Questions and Answers
What is a key characteristic of short polling?
What is a key characteristic of short polling?
- The resource only responds when it has new data.
- The client maintains a persistent connection with the resource.
- The client continuously makes requests to the resource at specified intervals. (correct)
- The resource pushes data to the client whenever there's a change.
In long polling, what happens if the resource doesn't have data when the client makes a request?
In long polling, what happens if the resource doesn't have data when the client makes a request?
- The resource forwards the request to another available server.
- The resource keeps the connection open and responds later when data is available. (correct)
- The resource closes the connection and the client must re-initiate.
- The resource immediately sends an empty response.
Which method establishes a continuous, bidirectional connection between the client and the resource?
Which method establishes a continuous, bidirectional connection between the client and the resource?
- Short polling
- Resource polling
- Long polling
- WebSockets (correct)
In WebSockets, who has control over when data is pushed to the client?
In WebSockets, who has control over when data is pushed to the client?
When is short polling generally considered acceptable?
When is short polling generally considered acceptable?
When is long polling a good choice for data transfer?
When is long polling a good choice for data transfer?
Which type of application benefits most from WebSockets?
Which type of application benefits most from WebSockets?
What is a drawback of using WebSockets?
What is a drawback of using WebSockets?
What is the primary factor that makes short polling generally a bad idea?
What is the primary factor that makes short polling generally a bad idea?
Which data transfer method is most suitable for a web chat application with many users?
Which data transfer method is most suitable for a web chat application with many users?
Flashcards
Short Polling
Short Polling
Client repeatedly makes requests to the resource at a specified interval, and the resource responds every time, repeating on short cycles.
Long Polling
Long Polling
Client initiates a request; the resource holds the connection open until data is available, then responds, or responds immediately if data is present.
Web Sockets
Web Sockets
A persistent connection is established between the client and resource, allowing bidirectional data flow at any time.
When is short polling acceptable?
When is short polling acceptable?
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When is long polling a good idea?
When is long polling a good idea?
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When are web sockets useful?
When are web sockets useful?
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Study Notes
- Web sockets are a variation of long polling, establishing a constant connection "highway" between a client and a resource.
Web Sockets
- The resource server has full control, facilitating bidirectional data flow.
- Data events from the resource can be pushed to the client whenever it wants.
- A constant connection is maintained.
Short Polling
- The client repeatedly requests data from the resource at set intervals, with the resource responding each time.
- This repeats incessantly.
- Short polling is generally not recommended, except for quick prototyping or when network calls are infrequent and data transfer is minimal.
Long Polling
- The client requests data from the resource.
- The resource holds the connection open if data is unavailable, responding later when data becomes available or immediately if data exists.
- Long polling is generally good when traffic is light but scales up well with high traffic.
Use Cases
- Short Polling: Rapid prototyping.
- Long Polling: When traffic is inconsistent.
- Web Sockets: Applications needing minimal latency or real-time data updates to multiple users.
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Description
Explore web sockets, short polling, and long polling techniques for real-time data transfer. Web sockets maintain a constant connection for bidirectional data flow. Polling techniques involve client requests at intervals or holding connections open until data is available.
