Increase timeout of workflow manager HTTP Get requests
We have a large number of customers who are using our custom workflow actions in SharePoint Online to automate document conversions. This works quite well, but we have recently identified a problem where HTTP requests in declarative workflow actions are set to a very short time out.
When running on-premise this setting can be tweaked via PowerShell by modifying 'WorkflowServiceMaxHttpResponseTime' (See https://msdn.microsoft.com/en-us/library/jj680843(v=azure.10).aspx). However there appears to be no way to control this in SharePoint Online.
Now, the default 1 minute time-out may seem long, but quite a few operations take longer than a minute, e.g. merging multiple files together, carrying out OCR, etc.
All the heavy duty processing happens on our back-end servers, so don't impact SharePoint Online's front-end & Workflow Manager servers, we just need a more reasonable timeout.
This is by design. Long running operations such as doc assembly or OCR should be done using an async pattern using WaitForCustomEvent/PublishCustomEvent