Search notes:

HTTP Header: Content-Type

The HTTP Header Content-Type transmits (among others?) a MIME type.
Often, Content-Type has a value like But I have also seen (in an OData environment): 
application/json; odata.metadata=minimal; odata.streaming=true
In POST requests, I have seen:

See also

The response header X-Content-Type-Options header`.
Compare also with Accept-Charset

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