Unable to format JSON data to call 3rd party webservice

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I may have found the root cause of the failure when I tried to call the webservice but have no idea how to resolve it.

The issue lies with the header content type.

headers : {
“content-type” : “application/json”
},

When it is received at the 3rd party server, the header content type became text/plain instead of application/json.

How can I set the header content type which I already set in my code as shown above.

Please advise.

Thanks.