public Response requestPost(String url, String body, Map<String, String> headers) {
        return requestHttpMethod(url, body, headers, "POST");
    }
Execute a POST request on the given URL.

@param url the HTTP endpoint
@param body the payload of the POST request
@param headers a map that stores the POST request headers
@return the response to the POST request
@throws ConnectException if execution of the POST request fails
connect/runtime/src/test/java/org/apache/kafka/connect/util/clusters/EmbeddedConnect.java