Question

I am posting a url with params containg an underscore (_).

sample: http://sdsdsds_asasasahjhd.com/dsdsdsd/login.json?

I am posting it like this:

    HttpClient httpclient = new DefaultHttpClient();
    HttpPost httppost = new HttpPost("http://sdsdsds_asasasahjhd.com/dsdsdsd/login.json?");
    try {
        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
        nameValuePairs.add(new BasicNameValuePair("key1", "value1"));
        nameValuePairs.add(new BasicNameValuePair("key2", "value2"));
        nameValuePairs
                .add(new BasicNameValuePair("key3", "value3"));
        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

        // Execute HTTP Post Request
        HttpResponse response = httpclient.execute(httppost);

    } catch (Exception e) {
        e.printStackTrace();
    }

When I am inspecting httpclient.execute(httppost) I am getting IllegalArgumentException and in catch in exception details it is telling Host name cannot be null.
Please specify any solution.

I have gone through some other questions here:

• java.lang.IllegalStateException: Target host must not be null, or set in parameters
• Host name may not be null in HttpResponse execute for android

but no use as I am not encoding the whole url.

Answer 1

well it clearly states that the host name can not be null.. your url doesn’t specify one..

a url is expected to be in the format

http://hostName.com/example..../example.json