I'm trying to update an HTML Email Template that I have created on SFMC, I make a HttpRequest using the following call on Apex:


The body of the Json is the following:


in where the variable htmlBody contains a valid HTML page. If I make the call using an external tool (like Postman or Advanced Rest Client of Google) it works fine and the HTML Email template was successfully updated, but if I make the call on Apex (using POST, PUT or PATCH) then the following error appears:

System.HttpResponse[Status=Bad Request, StatusCode=400]

I also tried to escape the quotes that the HTML contains and also use the simple quote but the same error keep appearing.

I really appreciate any suggestions!



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