Decouple backend processing from a frontend host, where backend processing needs to be asynchronous, but the frontend still needs a clear response.

For more information about this pattern, see Asynchronous Request-Reply pattern on the Azure Architecture Center.

• Azure CLI
• .NET Core SDK version 6
• Azure Functions Core Tools

1. Clone or download this repo.

2. Navigate to the async-request-reply folder.

   cd async-request-reply

3. Create a resource group.

   az group create --name rg-asyncrequestreply --location eastus

4. Deploy the template.

   az deployment group create -g rg-asyncrequestreply -f deploy.bicep

5. Wait for the deployment to complete.

1. Navigate to the async-request-reply/src folder.

   cd src

2. Deploy the app.

   FUNC_APP_NAME=$(az deployment group show -g rg-asyncrequestreply -n deploy --query properties.outputs.functionAppName.value -o tsv)
   
   func azure functionapp publish $FUNC_APP_NAME --dotnet

1. Send an http request through the Async Processor Work Acceptor

   curl -X POST "https://${FUNC_APP_NAME}.azurewebsites.net/api/asyncprocessingworkacceptor" --header 'Content-Type: application/json' --header 'Accept: application/json' -k -i -d '{
      "id": "1234",
      "customername": "Contoso"
   }'

   The response will be something like:

    HTTP/1.1 202 Accepted
    Content-Length: 155
    Content-Type: application/json; charset=utf-8
    Date: Wed, 13 Dec 2023 20:18:55 GMT
    Location: http://<appservice-name>.azurewebsites.net/api/RequestStatus/<guid>

   Using a browser open the url from the Location field in the response. A file with the data you have sent will be downloaded.

   Note the app uses the WEBSITE_HOSTNAME environment variable. This environment variable is set automatically by the Azure App Service runtime environment. For more information, see Azure runtime environment

1. Delete all the Azure resources for this Cloud Async Pattern

   az group delete -n rg-asyncrequestreply -y

You could open the solution with Visual Studio, then you need to create on the root local.settings.json

 {
 "IsEncrypted": false,
 "Values": {
     "AzureWebJobsStorage": "UseDevelopmentStorage=true",
     "FUNCTIONS_WORKER_RUNTIME": "dotnet",
     "ServiceBusConnectionAppSetting": "<yourdata>",
     "StorageConnectionAppSetting": "<yourData>"
 }
 }