Podcast
Questions and Answers
In short polling, how does a client get updates from a resource?
In short polling, how does a client get updates from a resource?
- The client only checks for updates when the user manually refreshes.
- The client continuously asks the resource for updates at set intervals. (correct)
- The resource pushes updates to the client.
- The resource keeps a connection open and sends updates when available.
Which polling method involves the client making a request and the resource holding the connection open until it has data to send?
Which polling method involves the client making a request and the resource holding the connection open until it has data to send?
- Web sockets
- Resource polling
- Short polling
- Long polling (correct)
What is a key characteristic of web sockets in terms of connection?
What is a key characteristic of web sockets in terms of connection?
- Connections are initiated by the resource, not the client.
- Connections are opened and closed for each request.
- A persistent, bidirectional connection is maintained between client and resource. (correct)
- Connections are only open when data needs to be transferred.
In which technique does the resource have the ability to push data to the client at any time?
In which technique does the resource have the ability to push data to the client at any time?
Which of the following is generally considered the LEAST efficient method for real-time data updates?
Which of the following is generally considered the LEAST efficient method for real-time data updates?
For prototyping an application quickly, which polling method might be acceptable, even if not ideal long-term?
For prototyping an application quickly, which polling method might be acceptable, even if not ideal long-term?
When is long polling generally a good choice for data updates?
When is long polling generally a good choice for data updates?
For applications requiring very low latency communication, which technique is most suitable?
For applications requiring very low latency communication, which technique is most suitable?
Which application type is given as an example where web sockets would be particularly useful?
Which application type is given as an example where web sockets would be particularly useful?
In contrast to short polling, what is a benefit of long polling and web sockets concerning resource usage?
In contrast to short polling, what is a benefit of long polling and web sockets concerning resource usage?
Flashcards
Short Polling
Short Polling
Client continuously makes calls to the resource at specified intervals, resource responds every time. Repeats on short cycles.
Long Polling
Long Polling
Client initiates a request, resource holds the connection open and responds when data is available, or responds immediately if data exists.
Web Sockets
Web Sockets
Opens a persistent, bidirectional communication channel between client and resource for real-time data exchange.
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 Web Sockets
When to use Web Sockets
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Study Notes
- Web sockets are a slight variation of long pulling, establishing a connection between a client and a resource.
- The resource server has complete control, pushing data events to the client at any time.
- This creates a bidirectional relationship with free data flow.
- The resource's control and push capabilities are advantageous.
- A persistent connection between the client and resource poses a drawback.
Short Polling
- The client continuously makes calls to the resource at specified intervals, with the resource responding every time.
- This process repeats on very short cycles.
Long Polling
- The client initiates a request to the resource.
- If the resource lacks data, it keeps the connection open to respond later.
- If the resource has data, it responds immediately.
Web Sockets
- A connection is established between the client and the resource.
- As data changes on the back-end, it is pushed to the client at the resource's discretion.
When to use each technique
Short Polling
- It is almost always a bad idea.
- Acceptable if prototyping an application rapidly or encountering a long delay between network calls with limited data transfer.
Long Pulling
- Generally advisable, working well with little traffic and scaling quickly during high traffic.
Web Sockets
- Useful in specific cases, such as applications requiring very low latency between the client and resource.
- Suited for scenarios like webchat applications with many users needing message pushes from the resource server.
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Description
Explore web sockets, short polling, and long polling techniques. Understand the nuances of each method for real-time data communication. Learn when to use each technique.
