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 encrypt data transmissions.
- To compile code.
- To manage server infrastructure.
- To retrieve data. (correct)
In the context of these techniques, what do 'client' and 'resource' typically represent?
In the context of these techniques, what do 'client' and 'resource' typically represent?
- User interface and database, respectively.
- Frontend application and backend server, respectively. (correct)
- Web browser and search engine, respectively.
- Operating system and hardware, respectively.
What is the distinguishing characteristic of short polling?
What is the distinguishing characteristic of short polling?
- The server queues requests.
- The client continuously makes calls to the server. (correct)
- The client maintains a persistent connection.
- The server pushes updates to the client.
In short polling, what are the two possible responses from the resource server?
In short polling, what are the two possible responses from the resource server?
What is a major disadvantage of using short polling?
What is a major disadvantage of using short polling?
How does long polling differ from short polling?
How does long polling differ from short polling?
In long polling, what happens if the resource server doesn't have data when the client makes a request?
In long polling, what happens if the resource server doesn't have data 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?
Which technique involves the client initiating a request to the resource?
Which technique involves the client initiating a request to the resource?
What is a potential drawback of long polling?
What is a potential drawback of long polling?
Flashcards
Short Polling
Short Polling
A technique where the client continuously makes calls to the resource server to retrieve data, waiting a short time between each call.
Long Polling
Long Polling
A technique where the client makes a request to the resource, and the resource keeps the connection open until data is available, then responds.
Disadvantage of Short Polling
Disadvantage of Short Polling
Client repeatedly makes calls to the resource server, wasting resources even when no data is available.
Potential Drawback of Long Polling
Potential Drawback of Long Polling
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Study Notes
- Short polling, long polling, and web sockets are techniques for retrieving data.
Short Polling
- A client, such as a JavaScript application, continuously makes calls to a resource server, like a Node.js backend, to retrieve data.
- The resource server responds with either an empty payload or a data object.
- After receiving the response, the client waits for a short interval (e.g., 3 seconds) and repeats the process.
- Drawback: the client continuously uses up resources on both its side and the resource server's side.
Long Polling
- The client makes a request to the resource server.
- If the resource server has data, it responds immediately.
- If the resource server doesn't have data, it keeps the connection open until data arrives.
- Once data is available, the resource server sends it back to the client through the existing connection.
- Advantage: avoids wasting cycles between the client and the resource server.
- One call is made, and the resource responds when data arrives.
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Description
Client-server communication techniques compared. Short polling continuously requests data, while long polling waits for data availability. WebSockets enable persistent, bidirectional communication, reducing resource waste.
