通过其他服务器转发Java HTTP请求

Question

我有两个AWS实例I1和I2，IP地址分别为ip1和ip2。我想要实现的是：

• 我想从I1（使用java httpclient）获取一个URL，并希望该请求应该通过I2实例，即外部世界它应该看起来请求来自实例I2。

例如 ：

我正在从实例I1执行下面提到的代码：

class Test {

    public static void main(String[] args) {

String url = "https://api.ipify.org?format=json",
       proxy = "ip2";
       Proxy p = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(proxy, 80));
 URL server = new URL(url);
Properties systemProperties = System.getProperties();
HttpURLConnection connection = (HttpURLConnection)server.openConnection(p);
connection.connect();
String theString = IOUtils.toString(connection.getInputStream(), StandardCharsets.UTF_8);
 System.out.println(theString);
}
}

输出应该是实例I2的公共IP。但它抛出异常：

Exception in thread "main" java.net.ConnectException: Connection refused (Connection refused)
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
        at java.net.Socket.connect(Socket.java:589)
        at java.net.Socket.connect(Socket.java:538)
        at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
        at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
        at sun.net.www.http.HttpClient$1.run(HttpClient.java:515)
        at sun.net.www.http.HttpClient$1.run(HttpClient.java:513)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.net.www.http.HttpClient.privilegedOpenServer(HttpClient.java:512)
        at sun.net.www.http.HttpClient.openServer(HttpClient.java:553)
        at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:264)
        at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:367)
        at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191)
        at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1199)
        at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
        at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177)
        at sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:162)
        at sun.net.www.protocol.https.HttpsURLConnectionImpl$connect.call(Unknown Source)
        at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:117)
        at com.exp.Test.main(Test.java:24)

我用Google搜索了上面提到的用例但是找不到任何东西。任何帮助都是适当的。

Answer 1

此问题已修复。在实例I2上安装了squid服务器。