callbackurl - What is a callback URL in relation to an API? -

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I'm cutting the net, and can not wrap my head around the idea of ​​callback url. In my case I have some callback urls which I have to define myself is a popular "default callback URL" What exactly is this? Can you give an example in plain english?

A callback URL will be brought through the API method, which if you call it after completing it Then you call 

  POST /api.example.com/foo?callbackURL=http://my.server.com/bar

then When / foo is finished, it sends a request for http://my.server.com/bar . The content and method of that request are going to be different - check the documents that reach the API.


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