Secure Static IP for Java HTTPS using HttpURLConnection & Shield

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.Authenticator;
import java.net.HttpURLConnection;
import java.net.PasswordAuthentication;
import java.net.URI;
import java.net.URL;

public class HttpsTest {
    public static void main(String[] args) throws Exception {
        // Using localhost:8080 with QGPass
        URI uri = URI.create("http://localhost:8080");


        String proxyHost = uri.getHost();
        int proxyPort = uri.getPort();

        // Set Java system properties so all HTTPS calls go through the proxy
        System.setProperty("https.proxyHost", proxyHost);
        System.setProperty("https.proxyPort", String.valueOf(proxyPort));

        // Simple request to echo proxy IP address
        URL testUrl = new URL("https://ip.quotaguard.com");
        HttpURLConnection conn = (HttpURLConnection) testUrl.openConnection();

        int responseCode = conn.getResponseCode();
        System.out.println("Response code: " + responseCode);

        // Print the response body
        BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
        String line;
        while ((line = reader.readLine()) != null) {
            System.out.println(line);
        }
        reader.close();
    }
}

Docker File

# Start from a standard Java image
FROM eclipse-temurin:17-alpine

# Install curl
RUN apk add --no-cache curl

WORKDIR /app

# Copy Java file into the container
COPY HttpsTest.java .

# Fetch and unpack QGPass
RUN curl -sSL https://s3.amazonaws.com/quotaguard/qgpass-latest.tar.gz \
  | tar xz -C /app/

# Compile Java class
RUN javac HttpsTest.java

# Run Java app behind QGPass
CMD ["bin/qgpass", "java", "HttpsTest"]

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