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Call an externel WebService

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Posted on by Ilyes Ben Jaoued

Hello,

I'm working on a Business Central SaaS environment and I'm trying to consume an external web service using the HttpClient data type in AL. However, I'm encountering the following error when executing the HTTP request:

"An error occurred while executing the HTTP request. Make sure you are connecting to a valid endpoint."

I've confirmed that the endpoint URL is correct and accessible via browser/Postman, Is there any additional configuration required in BC SaaS for HttpClient calls? Could this be related to certificate validation, or https requested?

Thanks in advance for your help!

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Dynamics 365 Business Central

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Sohail Ahmed 11,150 Super User 2025 Season 2 on at

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This error can sometimes occur even if the endpoint works in a browser or Postman. A few things to double-check:

✅ Handle all headers and authentication properly. If the service requires API keys or other custom headers, make sure they're correctly set in your HttpRequestMessage. Missing or incorrect headers can cause silent failures.

✅ Log the full response content for more insight. Even if the call fails, check HttpResponseMessage.IsSuccessStatusCode() and read the content using Response.Content.ReadAsString() to see if the service is returning a more detailed error message.

If you're still having trouble, feel free to share a snippet of your AL code and the request/response details (with sensitive info removed), and I’ll be happy to help you debug it further.

procedure CallExternalService() var Client: HttpClient; Request: HttpRequestMessage; Response: HttpResponseMessage; Content: Text; begin // Prepare the request Request.SetRequestUri('https://api.example.com/data'); Request.Method := 'GET'; // Add custom headers (e.g., API key) Request.GetHeaders().Add('Authorization', 'Bearer YOUR_API_KEY_HERE'); Request.GetHeaders().Add('Accept', 'application/json'); // Send the request if Client.Send(Request, Response) then begin // Check if the response was successful if Response.IsSuccessStatusCode() then begin Response.Content().ReadAs(Content); Message('Success: %1', Content); end else begin Response.Content().ReadAs(Content); Message('Failed. Status: %1 - %2', Response.HttpStatusCode(), end;

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YUN ZHU 95,729 Super User 2025 Season 2 on at

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Here are some tests I did with the Graph API, I hope that will give you some hints.

How to import/read files from SharePoint (document library) to Business Central via AL (Graph API)

How to upload files from Business Central to SharePoint (document library) via AL (Graph API)

Manage attachments in SharePoint (Save attachments externally and do not use BC capacity)

Thanks.

ZHU

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RockwithNav 8,637 Super User 2025 Season 2 on at

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This issue typically occurs when the endpoint URL is incorrect or incomplete. However, since you're able to trigger the request successfully in Postman, we can rule that out. Another possible cause could be the authentication token being generated on the Business Central side — try validating that.

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Ilyes Ben Jaoued 18 on at

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The issue involves a simple POST request that requires a JSON payload in the body. You can see the screenshot below.

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KP - Solution Archi... 658 on at

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Hi @IB-12051507-0

Can you check the authorization method in the AL code.

Thanks,

KP

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Rick Folkner 21 on at

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I'm getting the same error this morning, was working fine yesterday. Seemed to happen after BC updated to v26 last night. Did Microsoft change something in the http client in 26?

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Rick Folkner 21 on at

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I figured out my issue with this. in BC26 they added a feature that forces certificate validation on htttpclient calls. My issue was the certificate on the API Server had an issue so it wasn't validating.

Here is a link to the Microsoft documentation.

https://learn.microsoft.com/en-us/dynamics365/release-plan/2025wave1/smb/dynamics365-business-central/validating-certificates-external-web-service-endpoints-called-al-httpclient

Thanks,

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Khushbu Rajvi. 20,603 Super User 2025 Season 2 on at

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Hope this helps: https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/developer/devenv-httpclient

https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/webservices/calling-external-web-services

https://community.dynamics.com/forums/thread/details/?threadid=ddaaa569-3dc3-46c5-9260-35233d6a2012

https://businesscentralgeek.com/how-to-connect-to-external-apis-from-business-central-http-request

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