Java Utililty Methods HTTP Header

if (headers == null)
    return;
for (Entry<String, String> entry : headers.entrySet()) {
    urlConnection.setRequestProperty(entry.getKey(), entry.getValue());

HttpURLConnection con = (HttpURLConnection) new URL(url).openConnection();
con.setRequestMethod(GET);
for (Map.Entry<String, String> entry : headers.entrySet()) {
    con.setRequestProperty(entry.getKey(), entry.getValue());
return con.getInputStream();

HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setUseCaches(false);
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setRequestMethod(method);
conn.setRequestProperty("Content-Type", "application/json");
if (header != null && header.size() > 0)
    for (Entry<String, String> entry : header.entrySet()) {
...

String encode = "UTF-8";
String result = "";
try {
    HttpURLConnection urlCon;
    if (proxy == null) {
        urlCon = (HttpURLConnection) loc.openConnection();
    } else {
        urlCon = (HttpURLConnection) loc.openConnection(proxy);
...

URLConnection conn = null;
try {
    conn = openConnection(url);
    return conn.getHeaderField(name);
} catch (IOException e) {
    e.printStackTrace();
    return null;
} finally {
...

Map<String, String> header = new LinkedHashMap<String, String>();
for (int i = 0;; i++) {
    String mine = http.getHeaderField(i);
    if (mine == null)
        break;
    header.put(http.getHeaderFieldKey(i), mine);
return header;
...

return connection.getHeaderFieldInt(headerName, -1);

URLConnection conn = url.openConnection();
try {
    if (conn instanceof HttpURLConnection) {
        ((HttpURLConnection) conn).setRequestMethod("HEAD");
    return conn.getLastModified();
} finally {
    if (conn instanceof HttpURLConnection) {
...

String ret;
try {
    HttpURLConnection connection = (HttpURLConnection) httpURL.openConnection();
    connection.setRequestMethod("HEAD");
    connection.setConnectTimeout(3000);
    connection.setReadTimeout(1000);
    connection.connect();
    connection.getResponseCode();
...

URL url = new URL(u);
HttpURLConnection.setFollowRedirects(true);
HttpURLConnection uc = (HttpURLConnection) url.openConnection();
uc.setConnectTimeout(5000);
uc.setReadTimeout(5000);
uc.setRequestMethod("HEAD");
uc.setRequestProperty("Connection", "Close");
uc.connect();
...