Java Utililty Methods HTTP Read

long res = con.getContentLength();
if (res == -1) {
    try {
        String str = con.getHeaderField("content-length");
        if (str != null) {
            res = Long.parseLong(str);
    } catch (Throwable e) {
...

URL url = new URL(urlStr);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.connect();
InputStream inputStream = connection.getInputStream();
BufferedReader in = new BufferedReader(new InputStreamReader(inputStream));
StringBuilder builder = new StringBuilder();
String line;
while ((line = in.readLine()) != null) {
...

URL url = new URL(urlname);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
try {
    connection.setRequestMethod("HEAD");
    connection.connect();
    return connection.getContentType();
} finally {
    connection.disconnect();
...

return connection.getHeaderField(CONTENT_TYPE);

if (pv.isEmpty())
    return "";
OutputStreamWriter writer = null;
BufferedReader reader = null;
try {
    String body = "";
    for (Map.Entry<String, String> entry : pv.entrySet()) {
        body += entry.getKey() + "=" + URLEncoder.encode(entry.getValue(), "UTF-8") + "&";
...

URL url = new URL(urlString);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.connect();
InputStream is = connection.getInputStream();
int i;
String incomingMessage = "";
while ((i = is.read()) != -1) {
    incomingMessage = incomingMessage + (char) i;
...

URL htmlUrl = null;
InputStream inStream = null;
try {
    htmlUrl = new URL(url);
    URLConnection connection = htmlUrl.openConnection();
    HttpURLConnection httpConnection = (HttpURLConnection) connection;
    int responseCode = httpConnection.getResponseCode();
    if (responseCode == HttpURLConnection.HTTP_OK) {
...

return getHtmlContent(getConnection(url));

return getInputStream(conn, false); 

if (connection.getRequestMethod().equals("HEAD"))
    return null;
String encoding = connection.getContentEncoding();
if (encoding == null)
    return connection.getInputStream();
else if (encoding.equalsIgnoreCase("gzip"))
    return new GZIPInputStream(connection.getInputStream());
else if (encoding.equalsIgnoreCase("deflate"))
...