¿Cuánto dura la implementación de la encuesta?

How is long polling implementation?

To overcome this deficiency, Web app developers can implement a technique called HTTP long polling, where the client polls the server requesting new information. The server holds the request open until new data is available. Once available, the server responds and sends the new information.

Rather than having to repeat this process multiple times for every client until new data for a given client becomes available, long polling is a technique where the server elects to hold a client’s connection open for as long as possible, delivering a response only after data becomes available or a timeout threshold …

First, long polling allows clients to receive message updates immediately after they become available on the server, increasing the responsiveness of your webchat. The second advantage is that almost no change is required in the client application in order to work in this mode.

Long polling is a method that server applications use to hold a client connection until information becomes available. This is often used when a server must call a downstream service to get information and await a result.

The primary drawback to long-polling is that once the sender has sent data, it cannot send further data until a new poll request arrives. Also, since a new poll is made after each bit of data is received, this actually can result in excessive polling if the data rate is high enough.

Generally, WebSockets will be the better choice. Long polling is much more resource intensive on servers whereas WebSockets have an extremely lightweight footprint on servers. Long polling also requires many hops between servers and devices.

Amazon SQS long polling is a way to retrieve messages from your Amazon SQS queues. While the regular short polling returns immediately, even if the message queue being polled is empty, long polling doesn’t return a response until a message arrives in the message queue, or the long poll times out.