when you need to change accept and content type in respond code example

Example 1: difference between accept and content type header

Content-Type header is used in POST , PUT , PATCH to specify
the type of body you are sending to the serve and it's required. 

`Accept Header` can be used to ask the server to return
different type of response format 

For example :  

`/api/xname` endpoint , support both xml and json 
as response type so we can add accept header
`application/xml` to get xml result and `application/json` result. 

If server does not support such type ,
it will return `406 not acceptable` status code.

Example 2: content-type header api

Content-Type header is used in POST , PUT , PATCH to
specify the type of body you are sending 
to the serve and it's required.

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