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Sending HTTP Request from Model Driven App

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Posted on by anaida

Hi All,

This is a very basic concept, so I'm surprised that I can't find any content on this, but how does on send an HTTP request to an external endpoint from within a model driven app using client-side scripting?

Both fetch and XMLHTTPRequest fail to get a response from a container app we have set up in azure.

I've been trying to find a solution, and it seems like content-security-policy might have something to do with it? I'm honestly lost. Essentially, we're trying to do something like fetch("https://www.google.com") based on a form event in a model driven app.

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SebS 4,867 Super User 2026 Season 2 on at

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Hi @anaida

Have a look on this Topic:

https://powerusers.microsoft.com/t5/Microsoft-Dataverse/call-web-service-inside-model-driven-apps/td-p/373252

Regards

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anaida 15 on at

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Hi @SebS ,

There were two points of conversation in that thread as far as I can tell:

1. Calling a SOAP Web Service - this is not what I'm looking to do. Just trying to send HTTP request to an endpoint. I'm not sure if I'm performing a category error in saying that, please advise if I am.

2. Using Power Automate - this is not a potential solution for us as the user needs to send a request then seamlessly choose from a collection of options sent in the response to send another request which would ultimately end the process.

We've been able to use all sorts of other ES6 functionality built into the browser so far: I'm not sure what's special about using XMLHTTPRequest or Fetch? This resource seems to imply that it's possible. Is the problem with providing an external endpoint? If so, can I add it to some kind of whitelist?

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SebS 4,867 Super User 2026 Season 2 on at

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@anaida

So far, I did not need to deal with a similar scenario to yours, and power automation was enough for me. Sorry, I could not be more helpful and Hope someone with more experience will be able to answer your question.

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anaida 15 on at

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Found the solution, so posting here as a resource for others:

fetch() and XMLHTTPRequest sent from the browser have CORS policy applied, which means the response from the server must explicitly allow the origin of your app and the headers you send by attaching:
access-control-allow-credentials, access-control-allow-origin, Access-Control-Allow-Headers as response headers.

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