Android java.IOException: Illegal Character in hostname at index 0

Question

I wonder if anyone can help me on this. It's about android development.

i am using this image link for example. http://soompi_images.s3.amazonaws.com/4b1d3d685350b3ee612d098fda7e7441_large.jpg

I get the image using inputstream to get the image content.

InputStream is = 
   (InputStream) new URL("http://soompi_images.s3.amazonaws.com/4b1d3d685350b3ee612d098fda7e7441_large.jpg")
    .openStream();

This is to get the image from the image link for my drawable.

However, i am getting Illegal Character at hostname at index 0.

I have tried htmlEncode but it does not work. So i hope someone can help me.

Thanks.

Basic Coder · Accepted Answer · 2011-09-13 17:48:54Z

3

The Java URL-class cannot parse hostnames with underscores in it, such as *soompi_images* Pheonixblade9 is a really good work around.

answered Sep 13, 2011 at 17:48

Basic Coder

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4 Comments

xenlus Over a year ago

how should i work around it? I tried changing the _ to ASCII code it also does not work.

Basic Coder Over a year ago

The code below, posted by Pheonixblade9, works for me. Remove your code where you try to fetch the image and replace it with the code below.

xenlus Over a year ago

The code work in the way that it does not show error because of the try and catch. However, the image still does not appear. I am looking for a way which i can get the image. Thanks anyway!

Codeman Over a year ago

try stepping through the code. That's part of being a developer, debugging code that works for them to try to work in your situation.

Codeman · Accepted Answer · 2011-09-13 17:43:37Z

1

This is what I do:

private Bitmap LoadImage(String URL, BitmapFactory.Options options) //
{
    Bitmap bitmap = null;
    InputStream in = null;
    try //
    {
        in = OpenHttpConnection(URL);
        bitmap = BitmapFactory.decodeStream(in, null, options);
        in.close();
    } //
    catch (Exception ex) //
    {
        Logger.LogError("LoadImage", ex);
        return null;
    }
    return bitmap;
}

private InputStream OpenHttpConnection(String strURL) throws IOException //
{
    InputStream inputStream = null;
    URL url = new URL(strURL);
    URLConnection conn = url.openConnection();

    try //
    {
        HttpURLConnection httpConn = (HttpURLConnection) conn;
        httpConn.setRequestMethod("GET");
        httpConn.connect();

        if (httpConn.getResponseCode() == HttpURLConnection.HTTP_OK) {
            inputStream = httpConn.getInputStream();
        }
    } //
    catch (Exception ex) //
    {
        return null;
    }
    return inputStream;
}

Hope this helps!

answered Sep 13, 2011 at 17:43

Codeman

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10 Comments

xenlus Over a year ago

I can't get the image with this. Thanks anyway!

Codeman Over a year ago

what exactly isn't working about this? It works great for me. You do need to make sure you're doing this in the background, or it will freeze your app.

xenlus Over a year ago

Yea it is running in the background. I mean i still can't get the image with it as i suppose is because of the underscore. However, i can't change the url as it is not by me.

Codeman Over a year ago

What is the Exception being thrown by this? It works just fine with underscores in my app.

xenlus Over a year ago

The exception thrown is java.lang.NullPointerException.

|

Pavel · Accepted Answer · 2012-04-25 13:14:35Z

1

String url = "http://soompi_images.s3.amazonaws.com/4b1d3d685350b3ee612d098fda7e7441_large.jpg";

url = url.replace("soompi_images.s3.amazonaws.com", "s3.amazonaws.com/soompi_images");

InputStream is = (InputStream) new URL(url).openStream();

answered Apr 25, 2012 at 13:14

Pavel

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Comments

metaforge · Accepted Answer · 2014-08-26 20:48:48Z

The real answer is to not use an invalid hostname in your URL. You cannot count on any invalid hostnames working reliably.

The Internet standards (Requests for Comments) for protocols mandate that component hostname labels may contain only the ASCII letters 'a' through 'z' (in a case-insensitive manner), the digits '0' through '9', and the hyphen ('-'). The original specification of hostnames in RFC 952, mandated that labels could not start with a digit or with a hyphen, and must not end with a hyphen. However, a subsequent specification (RFC 1123) permitted hostname labels to start with digits. No other symbols, punctuation characters, or white space are permitted. <

Sources for what is a valid host name:

RFC 1123, RFC 952, Wikipedia

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