REST request with parameters - how to avoid default Content-Transfert-Encoding:quoted-printable ?

Here a workaround. AI suggest me to do my POST request with a groovy script (find bellow the groovy script that I used)

import org.apache.http.impl.client.CloseableHttpClient
import org.apache.http.entity.mime.MultipartEntityBuilder
import org.apache.http.impl.client.HttpClients
import org.apache.http.client.methods.HttpPost
import org.apache.http.util.EntityUtils

CloseableHttpClient httpClient = HttpClients.createDefault()
// Définir l'URL de votre service  
def url = context.expand('${#Global#endpoint.api-interco-url}')+'/interco/lot-bs'
HttpPost post = new HttpPost(url)

// Construire le corps de la requête pour multipart/form-data  
MultipartEntityBuilder builder = MultipartEntityBuilder.create()

// Ajouter des champs de formulaire  
// log.info context.expand('${=testCase.name}')
builder.addTextBody("filename", context.expand('${=testCase.name}') )
// log.info context.expand('${#TestCase#encodedFile}')
builder.addTextBody("content", context.expand('${#TestCase#encodedFile}') )

// Construire l'entité multipart  
def multipartEntity = builder.build()
post.setEntity(multipartEntity)

// Créer les en-têtes de la requête  
// post.setHeader("Content-Type", "multipart/form-data") // laisser le système déterminer le Content-Type
post.setHeader('Authorization', 'Bearer ' + context.expand('${#TestCase#intercoApiToken}'))
post.setHeader('X-Gravitee-Api-Key', context.expand('${#Project#x-gravitee-api-key.header.attribute}'))
post.setHeader('Content-Disposition', 'form-data')
post.setHeader('Content-transfert-encoding', '7bit')
// post.setHeader('Connection','Keep-Alive')

// Envoyer la requête HTTP POST  
def response = httpClient.execute(post)

// Gérer la réponse  
def responseContent = EntityUtils.toString(response.getEntity())

if (response.statusLine.statusCode == 200) {
    log.info "Réponse réussie : ${responseContent}"
} else {
    log.error "http status error code : ${response.statusLine.statusCode}"
    log.error "body content : ${responseContent}"
}

// Fermer le client  
httpClient.close()