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Misused header name, 'Content-Type'. Make sure request headers are used with HttpRequestMessage,

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Posted on by KK-21020735-0

101

I have the following error. please help me with Corrected text. I am ok in AL coding but not in JSON, or HTTP

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Job finished executing.
Status: Error
Error: Misused header name, 'Content-Type'. Make sure request headers are used with HttpRequestMessage, response headers with HttpResponseMessage, and content headers with HttpContent objects.

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local procedure GetAuthToken(var Token: Text): Boolean
    var
        Client: HttpClient;
        Request: HttpRequestMessage;
        Response: HttpResponseMessage;
        JsonResponse: JsonObject;
        Content: Text;
        Headers: HttpHeaders;
        BearerToken: JsonToken;
    begin
        Request.SetRequestUri('http://xxx.xxx.xxx.x:8080/elicensing/token/auth-bearer');
        Request.Method := 'POST';
        Request.GetHeaders(Headers);
        Headers.Add('Content-Type', 'application/json');
        Request.Content().WriteFrom('{"username": "xxxx", "password": "55555"}');
        Client.Send(Request, Response);
        if not Response.IsSuccessStatusCode() then
            exit(false);
        Response.Content().ReadAs(Content);
        JsonResponse.ReadFrom(Content);
        if JsonResponse.Contains('bearerToken') then begin
            JsonResponse.Get('bearerToken', BearerToken);
            Token := BearerToken.AsValue().AsText();
        end else
            Token := '';
        exit(Token <> '');
    end;

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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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Your code has a few mistakes related to how headers are handled.

Specifically, Request.GetHeaders() should be replaced with HttpContent.GetHeaders() when you're working with content-specific headers like Content-Type.

To help you understand better, I’ve attached a sample code snippet below that shows how to structure the request properly using HttpRequestMessage, HttpContent, and headers.

Let me know if you need help adjusting it to your use case.

Mark below checkbox to make this answer Verified if it helps you.

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

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I just noticed you're trying to generate an access token, so for your reference, I’m attaching my Access Token generation code as well.

Also, I believe a few parts of your code can be improved:

Avoid hardcoding the username and password directly in the code.

Instead of passing a hardcoded JSON string as text, consider using AL’s built-in AddJson() methods to build your request body more safely and cleanly.

procedure AccessToken() var lRecSetup: Record "Seller Cloud Setup"; HttpClient: HttpClient; HttpContent: HttpContent; HttpHeadersContent: HttpHeaders; HttpRequestMessage: HttpRequestMessage; HttpResponseMessage: HttpResponseMessage; JsonObject: JsonObject; _URL: Text; _RequestBodyContent: Text; _Response: Text; TokenResponseHandler: Codeunit "Token Response Handler"; begin Clear(_URL); Clear(_RequestBodyContent); Clear(_Response); Clear(JsonObject); lRecSetup.FindFirst(); _URL := lRecSetup."Token URL"; HttpRequestMessage.Method('POST'); HttpRequestMessage.SetRequestUri(_URL); JsonObject.Add('Username', lRecSetup."User Name"); JsonObject.Add('Password', lRecSetup.Password); JsonObject.WriteTo(_RequestBodyContent); HttpContent.WriteFrom(_RequestBodyContent); HttpContent.GetHeaders(HttpHeadersContent); HttpHeadersContent.Clear(); HttpHeadersContent.Add('Content-Type', 'application/json'); HttpRequestMessage.Content := HttpContent; HttpClient.Post(_URL, HttpContent, HttpResponseMessage); if (HttpResponseMessage.IsSuccessStatusCode) then begin HttpResponseMessage.Content.ReadAs(_Response); TokenResponseHandler.StoreTokenResponse(_Response); end; end;

Let me know if you need help refactoring your code.

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

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One more suggestion — avoid posting any confidential data (like client IDs, secrets, usernames, or tokens) in the community. Instead, replace them with asterisks (*) or placeholders to keep your information safe from misuse.

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KK-21020735-0 101 on at

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Thank you Sohail

I am not good in JSON handling , I know only AL , If you can give me

corrections in red color, in the same document. It would be more helpful.

I thank for that. I will practice to code later , your suggestions as reference.

Job finished executing.
Status: Error
Error: Misused header name, 'Content-Type'. Make sure request headers are used with HttpRequestMessage, response headers with HttpResponseMessage, and content headers with HttpContent objects.

Thanks in Advance

Warm regards

Kris

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KK-21020735-0 101 on at

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Thank you Sohail,'

I will keep in mind and will be careful next time.

Warm Regards

Kris

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Khushbu Rajvi. 20,601 Super User 2025 Season 2 on at

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You're adding 'Content-Type' to the wrong place. It must go on the HttpContent, not the HttpRequestMessage.

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