如何使用ktor kotlin发送带有POST的JSON字符串？

implementation "io.ktor:ktor-client-core:$ktorVersion"
implementation "io.ktor:ktor-client-json:$ktorVersion"

<dependency>
    <groupId>io.ktor</groupId>
    <artifactId>ktor-client-core</artifactId>
    <version>${ktorVersion}</version>
</dependency>
<dependency>
    <groupId>io.ktor</groupId>
    <artifactId>ktor-client-json</artifactId>
    <version>${ktorVersion}</version>
</dependency>

import io.ktor.client.HttpClient
import io.ktor.client.features.json.JsonFeature
import io.ktor.client.features.json.serializer.KotlinxSerializer
import io.ktor.client.request.header
import io.ktor.client.request.post
import io.ktor.http.ContentType
import io.ktor.http.HttpHeaders
import io.ktor.http.HttpMethod
import io.ktor.http.contentType

val client = HttpClient {
    install(JsonFeature) {
        serializer = KotlinxSerializer()
    }
}

suspend fun sendJsonData(url: String, json: String) {
    val response = client.post<Unit>(url) {
        header(HttpHeaders.ContentType, ContentType.Application.Json)
        body = json
    }
    // 处理响应
    println(response)
}