How to set encoding when use MappingJackson2HttpMessageConverter

[Clapmin]

i have a code like below

HttpHeaders headers = new HttpHeaders();
headers.add(HttpHeaders.CONTENT_TYPE, "application/json;charset=EUC-KR");
headers.add(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE);

RestTemplate restTemplate = RestUtils.getRestTemplate(readTimeout);
Map response = restTemplate.exchange(url, HttpMethod.POST, new HttpEntity<>(params, headers), Map.class).getBody();

Recently i updated spring 4.3* to 5.3*. After then it fail's to send request. Because, MappingJackson2HttpMessageConverter enforce encoding like UTF**(unicode)

@Override
public boolean canWrite(Class<?> clazz, @Nullable MediaType mediaType) {
    if (!canWrite(mediaType)) {
        return false;
    }
    if (mediaType != null && mediaType.getCharset() != null) {
        Charset charset = mediaType.getCharset();
        if (!ENCODINGS.containsKey(charset.name())) {
            return false;
        }
    }
    AtomicReference<Throwable> causeRef = new AtomicReference<>();
    if (this.objectMapper.canSerialize(clazz, causeRef)) {
        return true;
    }
    logWarningIfNecessary(clazz, causeRef.get());
    return false;
}

package com.fasterxml.jackson.core;

/**
 * Enumeration that defines legal encodings that can be used
 * for JSON content, based on list of allowed encodings from
 * <a href="http://www.ietf.org/rfc/rfc4627.txt">JSON specification</a>.
 *<p>
 * Note: if application want to explicitly disregard Encoding
 * limitations (to read in JSON encoded using an encoding not
 * listed as allowed), they can use {@link java.io.Reader} /
 * {@link java.io.Writer} instances as input
 */
public enum JsonEncoding {
    UTF8("UTF-8", false, 8), // N/A for big-endian, really
        UTF16_BE("UTF-16BE", true, 16),
        UTF16_LE("UTF-16LE", false, 16),
        UTF32_BE("UTF-32BE", true, 32),
        UTF32_LE("UTF-32LE", false, 32)
        ;
.......

how can i use 'euc-kr' as charset instead.

[poutsma]

According to the relevant specifications, JSON should be written in UTF-8, though UTF-16 or UTF-32 can also be used. Therefore, Jackson (and the Spring components that depend on Jackson) do not support writing non-UTF JSON.

In earlier versions of Spring Framework, the message converters ignored the character encoding completely, and wrote UTF-8 even though the Content-Type indicated otherwise. See #25076