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Mention X-Callback-Url

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Alex Ellis 2017-12-03 09:50:33 -06:00 committed by GitHub
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guide/chaining_functions.md
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@ -79,3 +79,15 @@ GitHub sends a "star" event to tweetfanclub function, tweetfanclub uses get-avat
This example uses a mix of regular binaries such as ImageMagick and Python handlers generated with the FaaS-CLI.
* [GitHub to Twitter Fanclub](https://github.com/alexellis/faas-twitter-fanclub/blob/master/README.md)
## Asynchronous call-backs
If you invoke a function asynchronously you have two options for getting the result back:
* Update the function
You can update your code to call another function / store state in another service
* X-Callback-Url
If you set a header for `X-Callback-Url` then that will be invoked after the function has run, [read more](https://github.com/openfaas/faas/blob/1aa6270fcc274cc36d90e0a9e4caa3eb71912ae0/guide/asynchronous.md#call-a-function)