引起：org.apache.http.ProtocolException：Content-Length标头已经存在

Question

当我尝试使用可关闭的http请求执行http请求时，遇到此内容长度标头已出现的错误

    package com.dotcomculture.arbbot;

    import org.apache.http.impl.client.CloseableHttpClient;
    import org.apache.http.impl.client.HttpClients;
    import org.apache.http.client.methods.HttpPost;
    import org.apache.http.client.methods.CloseableHttpResponse;

    public class ArbBot {

public static void main(String [ ] args)throws Exception{
System.out.println("I am in main" );
CloseableHttpClient httpClient = HttpClients.createDefault();
HttpPost httpPost = new HttpPost("https://api.sandbox.gemini.com");
httpPost.setHeader("Content-type", "text/plain");
httpPost.setHeader("Content-Length", "0");
httpPost.setHeader("X-GEMINI-APIKEY", "API KEY HERE");
httpPost.setHeader("X-GEMINI-PAYLOAD", "Payload here");
httpPost.setHeader("X-GEMINI-SIGNATURE", "Signature here");
httpPost.setHeader("Cache-Control", "0");

CloseableHttpResponse closeableHttpResponse = httpClient.execute(httpPost);

int statusCode = closeableHttpResponse.getStatusLine().getStatusCode();
System.out.println("Status Code : " +statusCode );




}

    }

下面的POM.XML

    <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpclient</artifactId>
        <version>4.5.5</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpcore -->
    <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpcore</artifactId>
        <version>4.4.9</version>
    </dependency>

如何删除默认内容长度标题？有谁知道？