Java Utililty Methods HTTP Response

StringBuffer sb = new StringBuffer();
BufferedReader br = null;
try {
    InputStream in = conn.getInputStream();
    br = new BufferedReader(new InputStreamReader(in));
    String line = "";
    while ((line = br.readLine()) != null) {
        sb.append(line);
...

boolean error = connection.getResponseCode() >= 400;
try (ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        InputStream inputStream = (!error) ? connection.getInputStream() : connection.getErrorStream()) {
    byte[] chunk = new byte[CHUNK_SIZE];
    int i;
    while ((i = inputStream.read(chunk)) > 0) {
        byteArrayOutputStream.write(chunk, 0, i);
    return byteArrayOutputStream.toByteArray();

InputStream inputStream = null;
BufferedReader bufferedReader = null;
try {
    StringBuilder stringBuilder = new StringBuilder();
    int responseCode = httpURLConnection.getResponseCode();
    if (responseCode / 100 == 2) { 
        inputStream = httpURLConnection.getInputStream();
    } else {
...

BufferedReader in;
StringBuffer response = new StringBuffer();
String line;
try {
    in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
} catch (Exception ex) {
    InputStream err = ((HttpURLConnection) conn).getErrorStream();
    if (err == null) {
...