Java Utililty Methods HTTP Response

if (httpConn.getErrorStream() == null) {
    return null;
} else {
    StringBuilder sb = new StringBuilder();
    BufferedReader in = new BufferedReader(new InputStreamReader(httpConn.getErrorStream()));
    String str;
    while ((str = in.readLine()) != null) {
        sb.append(str + "\n");
...

String headerField = conn.getHeaderField(null);
if (headerField == null) {
    return null;
StringBuffer sb = new StringBuffer();
sb.append(headerField).append("\r\n");
String key;
for (int i = 1; (key = conn.getHeaderFieldKey(i)) != null; i++) {
...

return ((HttpURLConnection) urlConnection).getHeaderField(headerName);

headers.clear();
String responseCode = "";
for (int i = 0;; i++) {
    String name = conn.getHeaderFieldKey(i);
    String value = conn.getHeaderField(i);
    if (name == null && value == null) {
        break;
    if (name == null) {
        responseCode = value;
    } else {
        headers.put(name, value);
return responseCode;

String responseMessage = null;
StringBuffer sb = new StringBuffer();
InputStream dis = connection.getInputStream();
int chr;
while ((chr = dis.read()) != -1) {
    sb.append((char) chr);
if (sb != null) {
...

try {
    return connection.getInputStream();
} catch (IOException ioe) {
    InputStream errorStream = connection.getErrorStream();
    if (errorStream != null) {
        return errorStream;
    throw ioe;
...

return httpOk(conn) ? conn.getInputStream() : conn.getErrorStream();

BufferedReader reader;
if (isSuccess) {
    reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
} else {
    reader = new BufferedReader(new InputStreamReader(conn.getErrorStream()));
StringBuffer stringBuffer = new StringBuffer();
String line = "";
...

HttpURLConnection conn = null;
try {
    conn = (HttpURLConnection) constructedUrl.openConnection();
    BufferedReader in = null;
    if (null == encoding) {
        in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
    } else {
        in = new BufferedReader(new InputStreamReader(conn.getInputStream(), encoding));
...

InputStream is = connection.getInputStream();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len;
while ((len = is.read(buffer)) > 0) {
    baos.write(buffer, 0, len);
String responseText = baos.toString("UTF8");
...