Send a request from APIM to event grid

Sairam Ganji 1

Hey Team,

I am looking a solution for below requirement.

Client is sending a request to Apim operation with a request body. I need to send the request to event grid topic with the same request body using a APIM operation (Like we need to write a policy to send a request to event grid)

Further Azure Functions might be the once how will be subscribed to an event
(Its the later part though, but suggestions on this is also welcomed)

Any suggestion or links for reference will be helpful

Pramod Valavala 20,601 Reputation points Microsoft Employee

2023-10-04T22:07:53.6133333+00:00

@Sairam Ganji Following up here to see if the response here helps

1 answer

Pramod Valavala 20,601 Reputation points Microsoft Employee

2023-09-21T14:56:35.24+00:00

@Sairam Ganji You could use the send-one-way-request or send-request policies if you need to send the request to Azure Event Grid, while forwarding the request to your backend.

If you need an endpoint to just a request to Azure Event Grid, you could simply setup the custom topic endpoint as a backend directly.

For processing the events, you could directly leverage the Azure Functions Event Grid Binding.
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Sairam Ganji 1 Reputation point

2023-09-22T10:07:59.4+00:00

@Pramod Valavala , thank you for reply.
I have tried using the backend service. it shows below error

{ "error": { "code": "BadRequest", "message": "This resource is configured to receive event in 'EventGridEvent' schema. The JSON received does not conform to the expected schema. Token Expected: StartArray, Actual Token Received: StartObject. Report 'f7d9cc14-33f3-431f-bdc6-3bfb039574ab:3:9/22/2023 5:50:32 AM (UTC)' to our forums for assistance or raise a support ticket.", "details": [{ "code": "InputJsonInvalid", "message": "This resource is configured to receive event in 'EventGridEvent' schema. The JSON received does not conform to the expected schema. Token Expected: StartArray, Actual Token Received: StartObject. Report 'f7d9cc14-33f3-431f-bdc6-3bfb039574ab:3:9/22/2023 5:50:32 AM (UTC)' to our forums for assistance or raise a support ticket." }] } }

I guess its expecting the request body in particular format.
Is there any way that we dont need to alter the request body coming to apim from client and the send the same to event grid from apim?

Even I tried send-request, policy was not accepting aeg-sas-key as a header, it was showing header not allowed

Sairam Ganji 1 Reputation point

2023-09-22T11:38:55.6933333+00:00

@Pramod Valavala , thank you for reply.
I have tried using the backend service. it shows below error

{ "error": { "code": "BadRequest", "message": "This resource is configured to receive event in 'EventGridEvent' schema. The JSON received does not conform to the expected schema. Token Expected: StartArray, Actual Token Received: StartObject. Report 'f7d9cc14-33f3-431f-bdc6-3bfb039574ab:3:9/22/2023 5:50:32 AM (UTC)' to our forums for assistance or raise a support ticket.", "details": [{ "code": "InputJsonInvalid", "message": "This resource is configured to receive event in 'EventGridEvent' schema. The JSON received does not conform to the expected schema. Token Expected: StartArray, Actual Token Received: StartObject. Report 'f7d9cc14-33f3-431f-bdc6-3bfb039574ab:3:9/22/2023 5:50:32 AM (UTC)' to our forums for assistance or raise a support ticket." }] } }

I guess its expecting the request body in particular format.
Is there any way that we dont need to alter the request body coming to apim from client and the send the same to event grid from apim?

Even I tried send-request, policy was not accepting aeg-sas-key as a header, it was showing not an allowed header

I would also be great if you guide about that schema.
Like suppose I have below api with operation

test-apim-to-eventgrid(api) -> (POST)sendmessage (operation)

Pramod Valavala 20,601 Reputation points Microsoft Employee

2023-09-22T16:01:46.19+00:00

@Sairam Ganji That is correct. You could use the set-body to update the request body before forwarding it to Event Grid.

The format of the body should conform to the Event Grid Schema mentioned in the official docs. This guide should help you more with some example payloads.
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Send a request from APIM to event grid

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