How do I post JSON to a REST API endpoint? [Java Code]

To post JSON to a REST API endpoint using Java, you must send an HTTP POST request to the REST API server and provide JSON data in the body of the Java POST message. You also need to specify the data type in the body of the POST message using the Content-Type: application/json request header. In this Java REST API POST example, we also send the Accept: application/json request header to tell the REST API server that the Java API client expects JSON in response. The Java code was automatically generated for the REST API POST example.
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