title: Postman API Invalid Content-Type Header
body: <p>I'm trying to test and API call for the Smartsheet API in Postman, but I keep receiving the same error. Even though I am defining the correct Content-Type as per the API documentation, the response I get is the <strong>error 1124</strong>, which is an <strong>invalid content-type header</strong>. I haven't been able to figure out exactly what is causing the issue. I have tried typing the header in the address and in the header tab in Postman, but neither option has given me the result I wanted.</p>
  
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