What is a callback URL in relation to an API?

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I've been scouring the net, and can't seem to wrap my head around the idea of a callback URL. In my case I have a few callback URLs that I have to define myself. A popular one is a "default callback URL". What is this exactly? Can you give an example in plain english?

A callback URL will be invoked by the API method you're calling after it's done. So if you call

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

Then when /foo is finished, it sends a request to http://my.server.com/bar. The contents and method of that request are going to vary - check the documentation for the API you're accessing.

What is a callback URL in relation to an API?, Callback URLs are the URLs that Auth0 invokes after the authentication process. Auth0 redirects back to this URL and� Callback URL aka redirect URL is used by web developers and application developers almost every day. You may have heard callback URL and default callback URL many times and have asked What is a callback URL in relation to an API or a website. Callback URL allows the webmaster to call back a webpage which was already left by the user to visit a new webpage.

Think of it as a letter. Sometimes you get a letter, say asking you to fill in a form then return the form in a pre-addressed envelope which is in the original envelope that was housing the form.

Once you have finished filling the form in, you put it in the provided return envelop and send it back.

The callbackUrl is like that return envelope. You are basically saying I am sending you this data. Once you are done with it, I am on this callbackUrl waiting for your response. So the API will process the data you have sent then look at the callback to send you the response.

This is useful because sometimes you may take ages to process some data and it makes no sense to have the caller wait for a response. For example, say your API allows users to send documents to it and virus scan them. Then you send a report after. The scan could take maybe 3minutes. The user cannot be waiting for 3minutes. So you acknowledge that you got the document and let the caller get on with other business while you do the scan then use the callbackUrl when done to tell them the result of the scan.

Callback URLs, Developers use callback URLs as part of this integration in order to provide directions on where a user should go after� ' {$request.body#/callbackUrl}': # The callback URL, refers to the URL passed in the request body This expression tells that the callback URL will be based on the parameters of the /subscribe operation. We will tell more about these expressions a bit later.

If you use the callback URL, then the API can connect to the callback URL and send or receive some data. That means API can connect to you later (after API call).

Example

  1. YOU send data using request to API
  2. API sends data using second request to YOU

Exact definition should be in API documentation.

Callback URLs — Twitter Developers, What exactly is a callback URL? In a field filled with complicated and confusing terms, a callback URL� What is CallBack URL And how is it related with API? Thanks. This discussion was modified 3 years, 6 months ago by Forcetalks. Kumar. Member. January 10, 2017 at 10

It's a mechanism to invoke an API in an asynchrounous way. The sequence is the following

  1. your app invokes the url, passing as parameter the callback url
  2. the api respond with a 20x http code (201 I guess, but refer to the api docs)
  3. the api works on your request for a certain amount of time
  4. the api invokes your app to give you the results, at the callback url address.

So you can invoke the api and tell your user the request is "processing" or "acquired" for example, and then update the status when you receive the response from the api.

Hope it makes sense. -G

Callback URLs Explained, Suppose, your API provides a POST /subscribe operation that expects a callback URL in the request body: callbacks are defined inside the related operation - post , put , and so on (not under the path� Callback URLs Explained. There's another great example of this explained in this Stack Overflow thread: What is a callback URL in relation to an API? You should be able to set up a callback URL using a single IP address similar to the way you would host multiple sites on a single Linode.

Another use case could be something like OAuth, it's may not be called by the API directly, instead the callback URL will be called by the browser after completing the authencation with the identity provider.

Normally after end user key in the username password, the identity service provider will trigger a browser redirect to your "callback" url with the temporary authroization code, e.g.

https://example.com/callback?code=AUTHORIZATION_CODE

Then your application could use this authorization code to request a access token with the identity provider which has a much longer lifetime.

Callbacks, With the wait option turned on for every request to the API, the connection will be held open until the image has been� App Callbacks. This type of callback URL is set up at the API app level. API apps are used to identify a partner integration and configure embedded flows ( embedded signing, embedded requesting, and embedded templates) and OAuth providers . All events that involve signature requests created by an API app are reported to this URL.

Wait and Callback URL � Kraken.io, "callbackInfo": "",. Contact Adobe Sign support to set the default callback url for complete account. You make an API call to some url. You receive a response. A callback function is called with the response as its arguments. This callback function is implemented in client-side, and you just pass the callback to the service function which actually makes the API call.

How to define a Callback URL while using REST API, What is the "Callback URL" in the application properties. VIA API Reference. API Reference; Getting Started; OAuth2� The default callback URL is related to the OAuth 1.0a protocol that Tumblr uses to authenticate your app. As the OAuth 1.0a specification explains: OAuth Authentication is done in three steps: 1. The Consumer obtains an unauthorized Request Token. 2. The User authorizes the Request Token. 3. The Consumer exchanges the Request Token for an Access Token.

What is the "Callback URL" in , Parameters to callbacks are formatted in JSON and submitted with a POST call. For job-related notifications, a Job� Você pode especificar a URL / ponto de extremidade / callback que deseja que seja notificado com esse retorno de chamada após a conclusão de alguma tarefa. Também é chamado de Callback URL Por exemplo, seu sistema pode fazer a chamada da API de terceiros, e nesta chamada especificar um Callback para quando algum evento ocorrer, esta sua

Comments
  • Would it cause an error if the callback URL is not set correctly?
  • @user3768495 I would expect it would not, but that's going to depend on the implementation of the API. It could, in theory, make the callback part of a transaction internally, and roll back any changes made by the original request if the callback doesn't return a 2xx response.
  • Do I need to send a response to the POST request at /api.example.com/foo ?
  • @Abhijeet You never need to. If it's appropriate to include a response, yes, do so.
  • On separate note, where do you guys think we should keep callback url, at client side or server side?