Curl.java

import java.net.MalformedURLException;
import java.net.URL;
import java.security.cert.Certificate;
import java.io.*;

import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLPeerUnverifiedException;

public class Curl {

   private final String url;

   public Curl(String url) {
     this.url = url;
   }

   public static void main(String[] args)
   {
        String url = "https://www.graalvm.org/";
        if(args.length > 0) {
          url = args[0];
        }
        new Curl(url).get();
   }

   private void get(){
      URL url;
      try {
	     url = new URL(this.url);
	     HttpsURLConnection con = (HttpsURLConnection)url.openConnection();

	     //dumpl all cert info
	     print_https_cert(con);

	     //dump all the content
	     print_content(con);

      } catch (MalformedURLException e) {
	     e.printStackTrace();
      } catch (IOException e) {
	     e.printStackTrace();
      }

   }

   private void print_https_cert(HttpsURLConnection con){

    if(con!=null){

      try {

	System.out.println("Response Code : " + con.getResponseCode());
	System.out.println("Cipher Suite : " + con.getCipherSuite());
	System.out.println("\n");

	Certificate[] certs = con.getServerCertificates();
	for(Certificate cert : certs){
	   System.out.println("Cert Type : " + cert.getType());
	   System.out.println("Cert Hash Code : " + cert.hashCode());
	   System.out.println("Cert Public Key Algorithm : "
                                    + cert.getPublicKey().getAlgorithm());
	   System.out.println("Cert Public Key Format : "
                                    + cert.getPublicKey().getFormat());
	   System.out.println("\n");
	}

	} catch (SSLPeerUnverifiedException e) {
		e.printStackTrace();
	} catch (IOException e){
		e.printStackTrace();
	}

     }

   }

   private void print_content(HttpsURLConnection con){
	if(con!=null){

	try {

	   System.out.println("****** Content of the URL ********");
	   BufferedReader br =
		new BufferedReader(
			new InputStreamReader(con.getInputStream()));

	   String input;

	   while ((input = br.readLine()) != null){
	      System.out.println(input);
	   }
	   br.close();

	} catch (IOException e) {
	   e.printStackTrace();
	}

       }

   }

}

Dockerfile

FROM oracle/graalvm-ce:20.0.0-java11 as build

RUN gu install native-image

WORKDIR /app

RUN curl -L -o musl.tar.gz https://github.com/gradinac/musl-bundle-example/releases/download/v1.0/musl.tar.gz && \
    tar -xvzf musl.tar.gz

ADD Curl.java .

RUN javac Curl.java
RUN native-image \
  --verbose \
  --no-server \
  --no-fallback \
  --static \
  --enable-https \
  --enable-all-security-services \
  -H:UseMuslC=bundle/ \
  -H:Name=curl \
  Curl

FROM scratch
COPY --from=build /app/curl .

#ENTRYPOINT ["./curl"]
ENTRYPOINT ["./curl", "https://wrong.host.badssl.com/"]