1.5

Workflow Operations
Each individual process in the overall workflow process can potentially be a long running
operation.
Accordingly, an initial HTTP request is submitted to initiate the workflow operation, then
additional requests are required to monitor progress and retrieve the final result. All the required
detail is included in the HTTP response headers of the initial request, including the URIs that
should be used for further processing
A successful request will return a response that will include the headers listed in the following
table:
Header Description
operationId The unique id of the operation being processed
Link Contains multiple link headers which provide details on which URI to use to
retrieve further information on the operation:
l Header with rel="progress" - The URL to use to check the progress of
the operation
l Header with rel="result" - The URL to use to retrieve the result of the
operation
l Header with rel="cancel" - The URL to use to cancel the operation
A request made to the progress URI during processing will return a progress percentage value
of 0 to 100, and finally the value of ‘done’ once the operation has completed.
A request made to the cancel URI during processing will immediately cancel the operation.
A request made to the result URI after processing has completed will return the final result of
the operation.
This approach is replicated across most workflow based services as demonstrated in the
Working with the Workflow Services page of the Working Examples section.
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