Develop Reference

HttpURLConnection.connect can connect to "https" but not "http"

I am trying to connect a http webpage using the following codes in Android system. The http webpage can not be connected, but https such as https://wwww.google.com can be successfully connected. Using getHeaderFields(), can get correct header for https://wwww.google.com, but get {} for http websites.
String link = "http://www.android.com/";
URL url = new URL(link);
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
conn.connect();

Uploading a file through HTTPS port using httpsurlconnection class

I have a server that only opens a port using port number 443. I need to upload a file to that server using Android client. My question is:
is it possible to connect and upload to such server using httpsurlconnection or do i need to use other class?
if it is possible, can you please show me an example of it?
thanks.

You should be able to do that simply by creating a URL with 'https' instead of 'http'.
Example from documentation:
URL url = new URL("https://www.android.com/");
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
try {
InputStream in = new BufferedInputStream(urlConnection.getInputStream());
readStream(in);
} finally {
urlConnection.disconnect();
}
Refer to the documentation for details:
https://developer.android.com/training/articles/security-ssl.html#HttpsExample
https://developer.android.com/reference/java/net/HttpURLConnection.html

Using Header and BasicHeader with HttpUrlConnection in android

In android 6.0 the org.apache.http.legacy library is deprecated, so i try to migrate a project to use HttpURLConnection.
In the project, i used the Header and the BasicHeader. I didn't found how i can replace these classes with HttpUrlConnection. I want just to know how can i add a header in a request using HttpUrlConnection.

URL url=new URL("YOURURL");
HttpURLConnection connection= (HttpURLConnection) url.openConnection();//establishing connection from url
connection.setDoOutput(true);
connection.setRequestMethod("POST");//method type
connection.setRequestProperty("Content-Type","application/json");// setting headers

Openssl handshake failed when using getInputStream() on Facebook profile picture in android sdk

I am trying to create user profile page for my app.
I succeed with connecting to Facebook, so i have the user basic profile using userProfile = Profile.getCurrentProfile();
Now i am trying to create a drawable of the user profile picture to put in a image view. For this I created a inputstream to fetch the image(running on asyncTask)
Bitmap x;
url = new URL("https://graph.facebook.com/939344862743414/picture?height=200&width=200");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestProperty("User-agent","Mozilla/4.0");
connection.setConnectTimeout(100000);
connection.connect();
BufferedInputStream buf = new BufferedInputStream(connection.getInputStream());
x = BitmapFactory.decodeStream(buf);
However no matter what I do,the app failed and crash when it reach the connection.getInputStream(). The error is javax.net.ssl.SSLProtocolException: SSL handshake aborted
I couldn't find any help on the web .It doesn't seem as an authorization problem because I can connect to Facebook and fetch data.
What I am doing wrong?

The issue is created by the url. As the URL contains https which means the web server certificate is issued by a well known CA, so that you can make a secure request. As you are using HttpURLConnection it doesn't support secured URL.
So you can enable the access to secured url (https://..) by using URLConnection in the place of HttpURLConnection. So modify the following line:
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
with this one:
URLConnection connection = (URLConnection) url.openConnection();
Detail information can be found here.

Setting the oauth "Authorization"header in Java - Android

I'm trying to set the access token with all of my network calls in my Android app.
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestProperty("Content-Type", "application/json");
conn.setRequestProperty("Authorization", "Token token="
+ accessToken);
conn.setRequestMethod("GET");
With this code, however, the header that our server is seeing is "HTTP_AUTHORIZATION" - not "AUTHORIZATION". After pouring over javadocs, I can't figure out how to not get it to append the "HTTP_".
Thanks!

You can't. The mapping of Authorization to HTTP_AUTHORIZATION is part of the CGI Specification and happens on the server.