public static CachedBodyOutputMessage newCachedBodyOutputMessage(final ServerWebExchange exchange) {
        HttpHeaders headers = new HttpHeaders();
        headers.putAll(exchange.getRequest().getHeaders());
        headers.remove(HttpHeaders.CONTENT_LENGTH);
        return new CachedBodyOutputMessage(exchange, headers);
    }
create CachedBodyOutputMessage.

@param exchange ServerWebExchange
@return CachedBodyOutputMessage.
shenyu-plugin/shenyu-plugin-base/src/main/java/org/apache/shenyu/plugin/base/utils/ResponseUtils.java