Business Central httpclient send request fails after upgrade to version 26

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Posted on by PD-02061932-0

After upgrading to version 26 the httpclient.send() fails with the Error 'NavHttpClient Request Failed'. It worked fine till the upgrade. I have tried several things like changing the RequestHeaders, etc. Nothing worked.

Anyone ran into the same issue? If so, how to solve?

Here is the code:

    var
        HttpClient: HttpClient;
        RequestHeaders: HttpHeaders;
        RequestMessage: HttpRequestMessage;
        ResponseMessage: HttpResponseMessage;
    begin
        // ....
        // Code below always worked fine: 
        RequestMessage.SetRequestUri(sURL);
        RequestMessage.Method := 'GET';
        RequestMessage.GetHeaders(RequestHeaders);
        RequestHeaders.Add('Accept', 'application/json');
        RequestHeaders.Add('Authorization', sAPIKey);      //Base64 converted API Key - which always worked
        if not HttpClient.Send(RequestMessage, ResponseMessage) then
            if GuiAllowed then
                ERROR('Geen response...')
            else begin
                //Other Code

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Dynamics 365 Business Central

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Sohail Ahmed 11,173 Super User 2026 Season 1 on at

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did you test this in postman as well? because i have just made a request (BC 26 version) and i didn't get any error

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PD-02061932-0 19 on at

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Thanks for your Reply Sohail Ahmed. I did test in Postman. Works fine. It just does not work in BC version 26.

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YUN ZHU 100,132 Super User 2026 Season 1 on at

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Hi, I was recently testing the Dataverse API, developing in a BC26.1 environment, and did not encounter your problem.

The code is written similarly to what I mentioned in previous posts, I hope the information below can give you some hints.

Dynamics 365 Business Central: Manage attachments in SharePoint (Save attachments externally and do not use BC capacity)

https://yzhums.com/60356/

Dynamics 365 Business Central: Can we get all environments within BC via AL (Not in Admin Center)

https://yzhums.com/61528/

Thanks

ZHU

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PD-02061932-0 19 on at

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Thank you Yun Zhu for your reply. The issue is solved. The reason was a rare confluence of circumstances. On the same day the version went live the certificate for the website was due. So, it was not the code, nor BC.

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Khushbu Rajvi. 22,342 Super User 2026 Season 1 on at

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If this provide you some hint: https://businesscentralgeek.com/how-to-connect-to-external-apis-from-business-central-http-request

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