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未从GDAX Sandbox HTTP连接获得任何响应。尝试连接gdax沙盒以修复连接以发出订单。GDAX沙盒修复连接
连接的URL = https://fix-public.sandbox.gdax.com
java.net.SocketException: Unexpected end of file from server
at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:851)
at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:678)
at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:848)
at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:678)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1569)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1474)
at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java:338)
at com.coinbase.exchange.api.HttpConnection.main(HttpConnection.java:43)
示例代码进行HTTP连接，并升级到FIX：
try {
String httpsURL = "https://fix-public.sandbox.gdax.com";
URL url = new URL(httpsURL);
//URLConnection conn = url.openConnection();
HttpsURLConnection conn = (HttpsURLConnection)url.openConnection();
conn.setRequestProperty("Connection", "Upgrade");
conn.setRequestProperty("Upgrade", "fix");
conn.connect();
System.out.println(" Connected url = " + url.toString());
System.out.println(" getResponseCode = " + conn.getResponseCode());
}