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[ASP.NET] .Net MVC implements long polling

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Posted on 12/1/2017 11:25:03 AM | | |

What is long polling?

    Long polling is a method of "server pushing" technology, which can transmit changes on the server to the client in real time without the need for the client to frequently refresh and send requests.

How long polling works?

    The client sends an Ajax request to the server, and after the server receives the request, it keeps the connection and does not return a message, and does not return the response information until the relevant processing is completed.

Use cases for long polls?

    Long polling is often used in scenarios such as web timely communication, monitoring, and instant quotation systems that need to send changes from the server to the client in real time.

Pros and cons of long polling?

Pros: Requests to the server are not frequently sent when there are no messages.

Disadvantages: Servers are more resource-intensive to keep connected

Implementation:

Front Desk Code:

In the callback, we call the function again so that after each request is closed, the next request begins.



Background Code:

Our backend controller uses asynchronous and inherits the AsyncController base class








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