Example query for durable function http trigger

Question

How to send instance_id to a HTTPTrigger?
If I want send instance_id from a client, should I encode it in HTTPRequest?

async def main(req: func.HttpRequest, starter: str, instance_id: str)

Answer 1

@kanna ,

Thanks for posting this Question in the Q&A forum.

Instance id can be passed to other activity functions in the following way. Same as you mentioned in the question.

async def main(req: func.HttpRequest, starter: str, instance_id: str) -> func.HttpResponse:
client = df.DurableOrchestrationClient(starter)

Encoding is not required as Transfer-Encoding is already enabled by default in Functions and it is set to chucked (Transfer-Encoding: chunked). Following is the sample response from durable functions

HTTP/1.1 202 Accepted
Content-Type: application/json; charset=utf-8
Date: Thu, 14 Dec 2021 06:13:51 GMT
Location: http://localhost:7071/runtime/webhooks/durabletask/instances/d3b72dddefce4e758d92f4d411567177?taskHub={taskHub}&connection={connection}&code={systemKey}
Retry-After: 10
Transfer-Encoding: chunked

{
"id": "d3b72dddefce4e758d92f4d411567177",
"sendEventPostUri": "http://localhost:7071/runtime/webhooks/durabletask/instances/d3b72dddefce4e758d92f4d411567177/raiseEvent/{eventName}?taskHub={taskHub}&connection={connection}&code={systemKey}",
"statusQueryGetUri": "http://localhost:7071/runtime/webhooks/durabletask/instances/d3b72dddefce4e758d92f4d411567177?taskHub={taskHub}&connection={connection}&code={systemKey}",
"terminatePostUri": "http://localhost:7071/runtime/webhooks/durabletask/instances/d3b72dddefce4e758d92f4d411567177/terminate?reason={text}&taskHub={taskHub}&connection={connection}&code={systemKey}"
}

Reference : https://learn.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-instance-management?tabs=python#wait-for-orchestration-completion

I hope this helps!

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