我在亚马逊 ec2 实例中创建了我的服务器。通过我的 android 应用程序,我使用 HttpUrlConnection 连接到服务器。但我得到的响应代码为-1。有没有人有任何想法?这是我的代码。私有字符串 getHttpResponse(最终字符串 srcUrl){
HttpURLConnection urlConnection = null;
FileOutputStream fos = null;
try {
URL url = new URL(srcUrl);
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.setRequestProperty("Content-Type", "application/json");
mETag = readETagFromPrefForCategory();
urlConnection.setRequestProperty("If-None-Match", mETag);
Authenticator.setDefault(new Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("xyz", "abc".toCharArray());
}
});
urlConnection.connect();
mETag = urlConnection.getHeaderField("ETag");
if (urlConnection.getResponseCode() == HttpURLConnection.HTTP_NOT_MODIFIED) {
Log.v("http","not modifed");
return readLocalJson();
}
if (urlConnection.getResponseCode() != HttpURLConnection.HTTP_OK) {
Log.w(TAG, "Bad response [" + urlConnection.getResponseCode() + "] from (" + srcUrl + ")");
return null;
}}//end of try block