POST works from POSTMAN but not from groovy trigger

Summary:

We are triggering the PAAS service to post the data from cx system, we are able to post and getting the response from 'Postman' when we try the same from groovy trigger we re receiving the error. Can you please help me to understand if any mistake in the process

Content (required): Attaching the code for reference:

 def Serv = adf.webServices.APIAppointment

 def headers = [:] 

 headers.'Content-Type' = 'application/json' 

 Serv.requestHTTPHeaders=headers

 def Detail = [:]

 def Detail1 = [:]

 Detail.Location = "ADMC-WS-JED HAMDANIYAH"

 Detail.CustomerId = "2619"

 Detail.Advisor="ARNDT, William"

 Detail.Name = "test"

 def response = Serv.POST(Detail)

 println("Response:  "+response)

Version (include the version you are using, if applicable):