Check if URL is HTTPS or HTTP protocol?

Question

I am currently using the following to read a file from android docs here and here . The user selects (in the settings screen) if their site uses HTTP or HTTPS protocol. If their website uses the HTTP protocol then it works for both HttpURLConnection and HttpsURLConnection , but if their site uses HTTPS protocol then it doesn't work for HttpURLConnection protocol and worst of all it doesn't give me an exception error. Below is the sample code that I am using.

So in essence, how can I check to see if the web url is HTTPS protocol so checking if the user selected the correct protocol?

InputStream inputStream;
HttpURLConnection urlConnection;
HttpsURLConnection urlHttpsConnection;
boolean httpYes, httpsYes; 
try {
if (httpSelection.equals("http://")) {
  URL url = new URL(weburi);
  urlConnection = (HttpURLConnection) url.openConnection();
  inputStream = new BufferedInputStream((urlConnection.getInputStream()));
httpYes = True;
}
if (httpSelection.equals("https://")) {
  URL url = new URL(weburi);
  urlHttpsConnection = (HttpsURLConnection) url.openConnection();
  urlHttpsConnection.setSSLSocketFactory(context.getSocketFactory());
  inputStream = urlHttpsConnection.getInputStream();
  https=True;
}

catch (Exception e) {
//Toast Message displays and settings intent re-starts
}
finally {
  readFile(in);
if(httpYes){ 
    urlConnection.disconnect();
    httpYes = False;
 }
if(httpsYes){ 
    urlHttpsConnection.disconnect();
    httpsYes = False;
 } 
}
}

EDIT:

To elaborate some more. I need to see if it returns a valid response from a website? So if the user selected http instead of https how can I check to see if http is the incorrect prefix/protocol?

How can I check if the website uses HTTPS or HTTP protocol? If the user then only puts in say www.google.com and I append https:// or http:// prefix to it, how do I know which one is the correct one to use?

Answer 1

You can Use android URLUtil to check whether url is HTTP or HTTPS:

public static boolean isHttpUrl (String url)
Returns True iff the url is an http: url.

public static boolean isHttpsUrl (String url) 
Returns True iff the url is an https: url.

Edit:

public static boolean isValidUrl (String url)
Returns True iff the url is valid.

Answer 2

URLConnection result = url.openConnection();
if (result instanceof HttpsURLConnection) {
   // https
}
else if (result instanceof HttpURLConnection) {
   // http
}
else {
  // null or something bad happened
}

Answer 3

This can be checked by using Util .

• isHttpUrl returns True iff the url is an http: url.
• isHttpsUrl returns True iff the url is an https: url.

Answer 4

I have checked URLUtil class and checked that its contain so many methods for these kind of stuff, but i just extend the answer that you can simply do as below also :-

public static boolean isHttpOrHttpsUrl(String url) {
        String patter = "^(http|https|ftp)://.*$";
        if (url.matches(patter)){
            return true;
        }else{
            return false;
        }
    }

Answer 5

you can try this

    boolean httpYes, httpsYes;
     try {

      URL url = new URL(weburi);
      urlConnection = (HttpURLConnection) url.openConnection();
      inputStream = new BufferedInputStream((urlConnection.getInputStream()));
    httpYes = True;
    }


    catch (Exception e) {
    //Toast Message displays and settings intent re-starts
          URL url = new URL(weburi);
          urlHttpsConnection = (HttpsURLConnection) url.openConnection();
          urlHttpsConnection.setSSLSocketFactory(context.getSocketFactory());
          inputStream = urlHttpsConnection.getInputStream();
          https=True;
    }

Answer 6

试试这段代码：

mConnexion = (URLUtil.isHttpsUrl(mStringUrl)) ? (HttpsURLConnection) url.openConnection() : (HttpURLConnection) url.openConnection();

Answer 7

I think this works, at least it seems to be working, what do you guys think? I place this if statement just before the httpsYes = True and httpYes = True .

It seems that when the HTTPS protocol is selected it wants to redirect using response code 302, but for all other instances it connects with response code 200. I throw a new ConnectionException() error as that takes the user back to the settings screen to correct the URL error.

For the HTTPS protocol:

if (httpsURLConnection.getResponseCode() != 200) {
     throw new ConnectException();
}

For the HTTP protocol:

if (urlConnection.getResponseCode() != 200) {
     throw new ConnectException();
}

Comments? Should I use urlConnection.getResponseCode() > 199 && < 300 ? To cover all successful connects?

Answer 8

My recommendation is created function expression regular. for example:

public void testUrl(Object urlHttp){

    String url = "https://www.google.com";

    if(url.matches("^(https?)://.*$")){
     Object o = (HttpsURLConnection) urlHttp;
    }else{
     Object o = (HttpURLConnection) urlHttp;
    }
}

Regards