[HttpUrlConnection] #NetworkIO

HttpUrlConnection.java

public static String fetchHttpContent(String url, String postData, Map<String, String> headers) {
        log.debug("url:" + url);
        StringBuilder content = new StringBuilder();
        try {
            Util.disableSSL();
            log.debug("start connection to " + url);
            java.security.Security.setProperty("networkaddress.cache.ttl", "60");
            HttpURLConnection con = (HttpURLConnection) new URL(url).openConnection();
            con.setRequestProperty("Accept", CONTENT_TYPE);
            con.setRequestMethod(postData == null ? "GET" : "POST");
            con.setRequestProperty("Content-Type", CONTENT_TYPE);
            con.setDoOutput(postData != null);
            con.setConnectTimeout(60 * 1000);
            con.setReadTimeout(10 * 60 * 1000);
            if (headers != null) {
                for (String key : headers.keySet()) {
                    con.setRequestProperty(key, headers.get(key));
                }
            }
            OutputStream outputStream = null;
            if (postData != null) {
                outputStream = con.getOutputStream();
                outputStream.write(postData.getBytes());
                outputStream.flush();
            }

            boolean isSuccessful = con.getResponseCode() / 100 == 2;

            BufferedReader in = new BufferedReader(new InputStreamReader(isSuccessful ? con.getInputStream() : con.getErrorStream()));

            String inputLine;
            while ((inputLine = in.readLine()) != null) {
                content.append(inputLine);
                content.append('\n');
            }

            in.close();
            if (outputStream != null) {
                outputStream.close();
            }

            if (!isSuccessful) {
                log.error(content.toString());
            }

            return isSuccessful ? content.toString() : null;

        } catch (FileNotFoundException e) {
            log.debug("FileNotFoundException thrown when calling {}", url, e);

        } catch (IOException ex) {
            log.warn("Exception thrown when calling {}", url, ex);

        }
        return null;
    }