Converting Json Request Data to Form Data

import org.apache.http.HttpResponse
import org.apache.http.client.methods.HttpPost
import org.apache.http.entity.mime.MultipartEntityBuilder
import org.apache.http.entity.ContentType
import org.apache.http.impl.client.HttpClients
import org.apache.http.util.EntityUtils
import org.apache.http.message.BasicHeader
import groovy.json.JsonSlurper
 
def post = new HttpPost('http://test.com/api/v1/ServiceRequest/NewRequest')
 
def entityBuilder = MultipartEntityBuilder.create()
def boundary = "----WebKitFormBoundary7MA4YWxkTrZu0gW"
entityBuilder.setBoundary(boundary)
 
//JSON request is converted to JSON Object
def slurper = new JsonSlurper()
def params = slurper.parseText(requestBodyTextToTargetAPI)

//Form data is created by dynamically adding to the form data for each key and value in JSON.
params.each { key, value ->
    entityBuilder.addTextBody(""+key, ""+value, ContentType.TEXT_PLAIN )
} 

//If necessary, other header information is entered
post.addHeader(new BasicHeader('ApiKey', '##################################'))
post.setEntity(entityBuilder.build())
 
def client = HttpClients.createDefault()
 
def response
try {
    response = client.execute(post)
    
	//The flow can be interrupted with the result of the request and the response to the request can be directed by filling in the following variables, 
	//or the necessary business logic can be executed on the result.

    statusCodeToTargetAPI=response.getStatusLine().getStatusCode();
    requestErrorMessageToTargetAPI=EntityUtils.toString(response.getEntity());
} finally {
    response?.close()
    client?.close()
}