HTTP request throws UnknownHostException no matter the host?

Question

I would ultimately like to make a HTTP request to the NCBI Entrez database to retrieve some accession numbers. I'm starting out small here, so I wanted to make a functional HTTP request, regardless of the endpoint. But no matter the endpoint I use, a Unknown Host Exception is thrown. Why?

I have included all of my code, but the problem only happens in the method getEntireSubject.

import java.net.*;
import java.io.*;
import java.util.Scanner;

public class Subject {
  private String id;
  private String sequence;
  // Position on ref sequence where alignment with query begins, inclusive 
  private int start;
  // Position on ref sequence where alignment with query ends, inclusive
  private int end;

  public Subject(String accessNum, int hitFrom, int hitTo, String seq) {
    id = accessNum;
    sequence = seq;
    start = hitFrom;
    end = hitTo;
    getEntireSubject();
  }

  // Getters
  public String getSequence() {
    return sequence;
  }
  public int getStart() {
    return start;
  }
  public int getEnd() {
    return end;
  }

  // Fetches accession number from NCBI
  private void getEntireSubject() {
    try {
      String link = "https://eutils.ncbi.nlm.nih.gov/entrez/eutils/einfo.fcgi";
      link = "https://jsonplaceholder.typicode.com/posts/1";
      InputStream response = new URL(link).openStream();

      try (Scanner scanner = new Scanner(response)) {
        String responseBody = scanner.useDelimiter("\\A").next();
       System.out.println(responseBody);
      }
    } catch (Exception e) {
      System.out.println(e);
    }
  }
}