Java Utililty Methods HTTP Read

try {
    return readString(new BufferedReader(new InputStreamReader(conn.getErrorStream(), "UTF-8")));
} catch (Exception exc) {
    return "No error message";

String res = "";
BufferedReader reader = null;
try {
    HttpURLConnection conn;
    conn = (HttpURLConnection) (new URL(url)).openConnection();
    reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
    String line;
    while ((line = reader.readLine()) != null)
...

StringBuilder sb = new StringBuilder();
BufferedReader br;
br = new BufferedReader(new InputStreamReader(conn.getInputStream(), "utf-8"));
String line = null;
while ((line = br.readLine()) != null) {
    sb.append(line + "\n");
br.close();
...

ArrayList<Byte> a = new ArrayList<Byte>(100);
InputStream is = h.getInputStream();
int i = is.read();
while (i != -1) {
    a.add((byte) i);
    i = is.read();
byte b[] = new byte[a.size()];
...

InputStream inputStream = null;
ByteArrayOutputStream fileContent = null;
try {
    URL url = new URL(fileUrl);
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    if (referer != null) {
        connection.setRequestProperty("Referer", referer);
    inputStream = connection.getInputStream();
    fileContent = new ByteArrayOutputStream();
    byte[] buffer = new byte[FILE_READ_BUFFER_SIZE];
    int n = 0;
    while (-1 != (n = inputStream.read(buffer))) {
        fileContent.write(buffer, 0, n);
} finally {
    if (inputStream != null) {
        inputStream.close();
    if (fileContent != null) {
        fileContent.close();
return fileContent.toByteArray();

HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setReadTimeout(5000);
connection.setConnectTimeout(5000);
connection.setRequestProperty("User-Agent", "Mozilla/5.0");
connection.addRequestProperty("Content-Type", "application/json");
connection.addRequestProperty("Accept", "application/json");
BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
StringBuilder content = new StringBuilder();
...