JVM HTTP / HTTPS proxy configuration using jshell

proxy.jsh

import java.net.http.*;
import java.io.*;

var httpClient = HttpClient.newHttpClient();

var httpProxyHost = System.getProperty("http.proxyHost");
var httpProxyPort = System.getProperty("http.proxyPort");
var httpsProxyHost = System.getProperty("https.proxyHost");
var httpsProxyPort = System.getProperty("https.proxyPort");

void run(URI uri, String testName) throws IOException, InterruptedException {
  System.out.print("** " + testName + " ");
  System.out.println("*".repeat(60));
  System.out.println("url = " + uri);
  
  if(uri.toString().startsWith("https://")) {
    System.out.println("httpsProxyHost = " + httpsProxyHost);
    System.out.println("httpsProxyPort = " + httpsProxyPort);
  } else {
    System.out.println("httpProxyHost = " + httpProxyHost);
    System.out.println("httpProxyPort = " + httpProxyPort);
  }

  var request = HttpRequest.newBuilder().uri(uri).build();
  var response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
  System.out.println("\t-> " + response.statusCode());
}

var httpUrl = new URI("http://httpbin.org/get");
run(httpUrl, "HTTP GET");

var httpsUrl = new URI("https://httpbin.org/get");
run(httpsUrl, "HTTPS GET");

/exit

proxy.sh

#!/usr/bin/env sh

HTTP_PROXY_HOST=localhost
HTTP_PROXY_PORT=9000

HTTPS_PROXY_HOST=localhost
HTTPS_PROXY_PORT=9000

jshell \
  proxy.jsh

jshell \
  -R-Dhttp.proxyHost="$HTTP_PROXY_HOST" \
  -R-Dhttp.proxyPort="$HTTP_PROXY_PORT" \
  -R-Dhttps.proxyHost="$HTTPS_PROXY_HOST" \
  -R-Dhttps.proxyPort="$HTTPS_PROXY_PORT" \
  proxy.jsh