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guide/asynchronous.md
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By default functions are accessed synchronously via the following route: By default functions are accessed synchronously via the following route:
``` ```
$ http://gateway/function/{function_name} $ curl --data "message" http://gateway/function/{function_name}
``` ```
![](https://user-images.githubusercontent.com/6358735/29469107-cbc38c88-843e-11e7-9516-c0dd33bab63b.png) As of [PR #131](https://github.com/alexellis/faas/pull/131) asynchronous invocation is available for testing.
As of PR #131 asynchronous invocation is available for testing. *Logical flow for synchronous functions:*
![](https://user-images.githubusercontent.com/6358735/29469107-cbc38c88-843e-11e7-9516-c0dd33bab63b.png)
## Why use Asynchronous processing? ## Why use Asynchronous processing?
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* Consume a large batch of work within a few seconds and let it process at its own pace * Consume a large batch of work within a few seconds and let it process at its own pace
## How does it work? ## How does async work?
Here is a conceptual diagram Here is a conceptual diagram
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* [queue-worker](https://github.com/open-faas/nats-queue-worker) * [queue-worker](https://github.com/open-faas/nats-queue-worker)
## Deploy the Asynchronous stack ## Deploy the async stack
The reference implementation for asychronous processing uses NATS Streaming, but you are free to extend OpenFaaS and write your own [queue-worker](https://github.com/open-faas/nats-queue-worker). The reference implementation for asychronous processing uses NATS Streaming, but you are free to extend OpenFaaS and write your own [queue-worker](https://github.com/open-faas/nats-queue-worker).