Example usage for java.net HttpURLConnection getHeaderField

List of usage examples for java.net HttpURLConnection getHeaderField

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Introduction

In this page you can find the example usage for java.net HttpURLConnection getHeaderField.

Prototype

public String getHeaderField(int n)

Source Link

Document

Returns the value for the n th header field.

Usage

From source file:org.runnerup.export.FunBeatUploader.java

@Override
public Status upload(SQLiteDatabase db, long mID) {
    Status s;//  w  w w .  j  a va 2 s .co m
    if ((s = connect()) != Status.OK) {
        return s;
    }

    TCX tcx = new TCX(db);
    HttpURLConnection conn = null;
    Exception ex = null;
    try {
        StringWriter writer = new StringWriter();
        String id = tcx.export(mID, writer);
        conn = (HttpURLConnection) new URL(UPLOAD_URL).openConnection();
        conn.setInstanceFollowRedirects(false);
        addCookies(conn);
        getFormValues(conn); // execute the GET
        conn.disconnect();

        String viewKey = findName(formValues.keySet(), "VIEWSTATE");
        String eventKey = findName(formValues.keySet(), "EVENTVALIDATION");
        String fileKey = findName(formValues.keySet(), "FileUpload");
        String uploadKey = findName(formValues.keySet(), "UploadButton");

        Part<StringWritable> part1 = new Part<StringWritable>(viewKey,
                new StringWritable(formValues.get(viewKey)));

        Part<StringWritable> part2 = new Part<StringWritable>(eventKey,
                new StringWritable(formValues.get(eventKey)));

        Part<StringWritable> part3 = new Part<StringWritable>(fileKey, new StringWritable(writer.toString()));
        part3.contentType = "application/octet-stream";
        part3.filename = "jonas.tcx";

        Part<StringWritable> part4 = new Part<StringWritable>(uploadKey,
                new StringWritable(formValues.get(uploadKey)));
        Part<?> parts[] = { part1, part2, part3, part4 };

        conn = (HttpURLConnection) new URL(UPLOAD_URL).openConnection();
        conn.setInstanceFollowRedirects(false);
        conn.setDoOutput(true);
        conn.setRequestMethod("POST");
        addCookies(conn);
        postMulti(conn, parts);
        int responseCode = conn.getResponseCode();
        String amsg = conn.getResponseMessage();
        getCookies(conn);
        String redirect = null;
        if (responseCode == 302) {
            redirect = conn.getHeaderField("Location");
            conn.disconnect();
            conn = (HttpURLConnection) new URL(BASE_URL + redirect).openConnection();
            conn.setInstanceFollowRedirects(false);
            conn.setRequestMethod("GET");
            addCookies(conn);
            responseCode = conn.getResponseCode();
            amsg = conn.getResponseMessage();
            getCookies(conn);
        } else if (responseCode != 200) {
            System.err.println("FunBeatUploader::upload() - got " + responseCode + ", msg: " + amsg);
        }
        getFormValues(conn);
        conn.disconnect();

        viewKey = findName(formValues.keySet(), "VIEWSTATE");
        eventKey = findName(formValues.keySet(), "EVENTVALIDATION");
        String nextKey = findName(formValues.keySet(), "NextButton");
        String hidden = findName(formValues.keySet(), "ChoicesHiddenField");

        FormValues kv = new FormValues();
        kv.put(viewKey, formValues.get(viewKey));
        kv.put(eventKey, formValues.get(eventKey));
        kv.put(nextKey, "Nasta >>");
        kv.put(hidden, "[ \"import///" + id + "///tcx\" ]");

        String surl = BASE_URL + redirect;
        conn = (HttpURLConnection) new URL(surl).openConnection();
        conn.setInstanceFollowRedirects(false);
        conn.setDoOutput(true);
        conn.setRequestMethod("POST");
        conn.addRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        addCookies(conn);
        {
            OutputStream wr = new BufferedOutputStream(conn.getOutputStream());
            kv.write(wr);
            wr.flush();
            wr.close();
            responseCode = conn.getResponseCode();
            amsg = conn.getResponseMessage();
            getCookies(conn);
            if (responseCode == 302) {
                redirect = conn.getHeaderField("Location");
                conn.disconnect();
                conn = (HttpURLConnection) new URL(BASE_URL + redirect).openConnection();
                conn.setInstanceFollowRedirects(false);
                conn.setRequestMethod("GET");
                addCookies(conn);
                responseCode = conn.getResponseCode();
                amsg = conn.getResponseMessage();
                getCookies(conn);
            }
            String html = getFormValues(conn);
            boolean ok = html.indexOf("r klar") > 0;
            System.err.println("ok: " + ok);

            conn.disconnect();
            if (ok) {
                return Uploader.Status.OK;
            } else {
                return Uploader.Status.CANCEL;
            }
        }
    } catch (IOException e) {
        ex = e;
    }

    s = Uploader.Status.ERROR;
    s.ex = ex;
    if (ex != null) {
        ex.printStackTrace();
    }
    return s;
}

From source file:at.spardat.xma.boot.transport.HTTPTransport.java

private Result getResourceImpl(IRtXMASessionClient session, URL url, long modifiedSince, String etag)
        throws CommunicationException {

    /* locals ---------------------------------- */
    Result result = new Result();
    int code = 0;
    HttpURLConnection conn;
    /* locals ---------------------------------- */

    try {//w w w.ja  va2  s .  c o  m
        conn = (HttpURLConnection) url.openConnection();
        if (conn instanceof HttpsURLConnection) {
            ((HttpsURLConnection) conn).setHostnameVerifier(hostnameVerifier);
        }
        sendCookies(session, url, conn);
        if (etag != null) {
            conn.setRequestProperty("If-None-Match", etag); //$NON-NLS-1$
        }

        String strUrl = url.toExternalForm();
        if (url.getQuery() == null && (strUrl.endsWith(".jar") || strUrl.endsWith(".xml"))) {
            conn.setRequestProperty(Statics.HTTP_CACHE_CONTROL, Statics.HTTP_MAX_AGE + "=0"); //$NON-NLS-1$
        }

        if (modifiedSince > 0) {
            // see sun bugid: 4397096
            // if HTTP_Util library is used, the original method may also be used.
            // conn.setIfModifiedSince(modifiedSince);
            conn.setRequestProperty(Statics.strIfModifiedSince, HTTPTransport.httpDate(modifiedSince));
        }
        conn.setRequestProperty(Statics.HTTP_ACCEPT, "*/*"); //$NON-NLS-1$
        conn.setRequestProperty(Statics.HTTP_USER_AGENT, Statics.HTTP_USER_AGENT_NAME);

    } catch (IOException exc) {
        log_.log(LogLevel.WARNING, "error loading '" + url.toString() + "' form server:", exc); //$NON-NLS-1$
        throw new ConnectException("error loading '" + url.toString() + "' form server:", exc);
    }

    try {
        code = conn.getResponseCode();
        if (code == HttpURLConnection.HTTP_NOT_MODIFIED) {
            result.contentLength_ = 0;
            result.lastModified_ = conn.getLastModified();
            if (result.lastModified_ <= 0) {
                result.lastModified_ = modifiedSince;
            }
            result.expirationDate_ = conn.getExpiration();
            result.etag_ = conn.getHeaderField(Statics.strEtag);
            if (result.etag_ == null) {
                result.etag_ = etag;
            }
            log_.log(LogLevel.FINE, "resource not modified: {0}", url.toExternalForm()); //$NON-NLS-1$
        } else if (code == HttpURLConnection.HTTP_OK) {
            result.contentLength_ = conn.getContentLength();
            result.lastModified_ = conn.getLastModified();
            result.expirationDate_ = conn.getExpiration();
            result.etag_ = conn.getHeaderField(Statics.strEtag);
            result.transformations_ = conn.getHeaderField(Statics.TRANSFORM_HEADER);

            result.setBuffer(this.readOutput(conn));

            if (result.contentLength_ < 0) {
                result.contentLength_ = result.buffer_.length;
            }
        } else if (code == HttpURLConnection.HTTP_MOVED_TEMP || code == HttpURLConnection.HTTP_MOVED_PERM) {
            String location = conn.getHeaderField(Statics.HTTP_LOCATION);
            throw new RedirectException("redirect received from " + url.toString() + " to " + location, code,
                    location);
        } else {
            if (code < 500)
                throw new ConnectException("error loading '" + url.toString() + "' from the server:", code);
            else
                throw new ServerException("error loading '" + url.toString() + "' from the server:", code);
        }
        readCookies(session, url, conn);
    } catch (RedirectException re) {
        throw re;
    } catch (CommunicationException ce) {
        if (code != 0)
            log_.log(LogLevel.WARNING, "http returncode: {0}", Integer.toString(code)); //$NON-NLS-1$
        log_.log(LogLevel.WARNING, "error loading '" + url.toString() + "' from the server:", ce); //$NON-NLS-1$
        throw ce;
    } catch (Exception ex) {
        if (code != 0)
            log_.log(LogLevel.WARNING, "http returncode: {0}", Integer.toString(code)); //$NON-NLS-1$
        log_.log(LogLevel.WARNING, "error loading '" + url.toString() + "' from the server:", ex); //$NON-NLS-1$
        if (code < 500)
            throw new ConnectException("error loading '" + url.toString() + "' from the server:", ex);
        else
            throw new ServerException("error loading '" + url.toString() + "' from the server:", ex);
    }

    return result;
}

From source file:org.runnerup.export.FunBeatSynchronizer.java

@Override
public Status upload(SQLiteDatabase db, long mID) {
    Status s;//from  www  .j ava 2 s  . c om
    if ((s = connect()) != Status.OK) {
        return s;
    }

    TCX tcx = new TCX(db);
    HttpURLConnection conn = null;
    Exception ex = null;
    try {
        StringWriter writer = new StringWriter();
        String id = tcx.export(mID, writer);
        conn = (HttpURLConnection) new URL(UPLOAD_URL).openConnection();
        conn.setInstanceFollowRedirects(false);
        addCookies(conn);
        getFormValues(conn); // execute the GET
        conn.disconnect();

        String viewKey = SyncHelper.findName(formValues.keySet(), "VIEWSTATE");
        String eventKey = SyncHelper.findName(formValues.keySet(), "EVENTVALIDATION");
        String fileKey = SyncHelper.findName(formValues.keySet(), "FileUpload");
        String uploadKey = SyncHelper.findName(formValues.keySet(), "UploadButton");

        Part<StringWritable> part1 = new Part<StringWritable>(viewKey,
                new StringWritable(formValues.get(viewKey)));

        Part<StringWritable> part2 = new Part<StringWritable>(eventKey,
                new StringWritable(formValues.get(eventKey)));

        Part<StringWritable> part3 = new Part<StringWritable>(fileKey, new StringWritable(writer.toString()));
        part3.setContentType("application/octet-stream");
        part3.setFilename("jonas.tcx");

        Part<StringWritable> part4 = new Part<StringWritable>(uploadKey,
                new StringWritable(formValues.get(uploadKey)));
        Part<?> parts[] = { part1, part2, part3, part4 };

        conn = (HttpURLConnection) new URL(UPLOAD_URL).openConnection();
        conn.setInstanceFollowRedirects(false);
        conn.setDoOutput(true);
        conn.setRequestMethod(RequestMethod.POST.name());
        addCookies(conn);
        SyncHelper.postMulti(conn, parts);
        int responseCode = conn.getResponseCode();
        String amsg = conn.getResponseMessage();
        getCookies(conn);
        String redirect = null;
        if (responseCode == HttpStatus.SC_MOVED_TEMPORARILY) {
            redirect = conn.getHeaderField("Location");
            conn.disconnect();
            conn = (HttpURLConnection) new URL(BASE_URL + redirect).openConnection();
            conn.setInstanceFollowRedirects(false);
            conn.setRequestMethod(RequestMethod.GET.name());
            addCookies(conn);
            responseCode = conn.getResponseCode();
            amsg = conn.getResponseMessage();
            getCookies(conn);
        } else if (responseCode != HttpStatus.SC_OK) {
            Log.e(getName(), "FunBeatSynchronizer::upload() - got " + responseCode + ", msg: " + amsg);
        }
        getFormValues(conn);
        conn.disconnect();

        viewKey = SyncHelper.findName(formValues.keySet(), "VIEWSTATE");
        eventKey = SyncHelper.findName(formValues.keySet(), "EVENTVALIDATION");
        String nextKey = SyncHelper.findName(formValues.keySet(), "NextButton");
        String hidden = SyncHelper.findName(formValues.keySet(), "ChoicesHiddenField");

        FormValues kv = new FormValues();
        kv.put(viewKey, formValues.get(viewKey));
        kv.put(eventKey, formValues.get(eventKey));
        kv.put(nextKey, "Nasta >>");
        kv.put(hidden, "[ \"import///" + id + "///tcx\" ]");

        String surl = BASE_URL + redirect;
        conn = (HttpURLConnection) new URL(surl).openConnection();
        conn.setInstanceFollowRedirects(false);
        conn.setDoOutput(true);
        conn.setRequestMethod(RequestMethod.POST.name());
        conn.addRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        addCookies(conn);
        {
            OutputStream wr = new BufferedOutputStream(conn.getOutputStream());
            kv.write(wr);
            wr.flush();
            wr.close();
            responseCode = conn.getResponseCode();
            amsg = conn.getResponseMessage();
            getCookies(conn);
            if (responseCode == HttpStatus.SC_MOVED_TEMPORARILY) {
                redirect = conn.getHeaderField("Location");
                conn.disconnect();
                conn = (HttpURLConnection) new URL(BASE_URL + redirect).openConnection();
                conn.setInstanceFollowRedirects(false);
                conn.setRequestMethod(RequestMethod.GET.name());
                addCookies(conn);
                responseCode = conn.getResponseCode();
                amsg = conn.getResponseMessage();
                getCookies(conn);
            }
            String html = getFormValues(conn);
            boolean ok = html.indexOf("r klar") > 0;
            Log.e(getName(), "ok: " + ok);

            conn.disconnect();
            if (ok) {
                s = Status.OK;
                s.activityId = mID;
            } else {
                s = Status.CANCEL;
            }
            return s;
        }
    } catch (IOException e) {
        ex = e;
    }

    s = Synchronizer.Status.ERROR;
    s.ex = ex;
    if (ex != null) {
        ex.printStackTrace();
    }
    return s;
}

From source file:com.roamprocess1.roaming4world.ui.messages.MessageAdapter.java

public boolean resumeImages(String msgSubject) {
    File file = null;/* ww w  .  j a  v a2 s.c  o  m*/
    long fileLength;

    try {

        String filename = "", num = "";

        URL url = new URL(imageUrl);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("GET");
        connection.setDoOutput(true);
        connection.connect();

        num = getNumber(msgSubject);
        filename = getTimestamp(msgSubject);

        file = new File(fileDir + "/" + getNumber(msgSubject) + "/Recieved", filename);
        if (!file.exists()) {
            file.createNewFile();
        }

        FileOutputStream fileOutput = new FileOutputStream(file);
        InputStream inputStream = connection.getInputStream();
        int totalSize = connection.getContentLength();
        Long downloadedSize = (long) 0;
        byte[] buffer = new byte[1024];
        int bufferLength = 0;
        while ((bufferLength = inputStream.read(buffer)) > 0) {
            fileOutput.write(buffer, 0, bufferLength);
            downloadedSize += bufferLength;
            Log.i("Progress:", "downloadedSize:" + downloadedSize + "totalSize:" + totalSize);
        }
        fileOutput.close();
        Log.d("downloadedSize", downloadedSize + " @");
        if (downloadedSize == totalSize) {
            downloadedimageuri = file.getAbsolutePath();
            return true;
        }

        if (file.exists()) {
            connection.setAllowUserInteraction(true);
            connection.setRequestProperty("Range", "bytes=" + file.length() + "-");
        }

        connection.setConnectTimeout(14000);
        connection.setReadTimeout(20000);
        connection.connect();

        if (connection.getResponseCode() / 100 != 2)
            throw new Exception("Invalid response code!");
        else {
            String connectionField = connection.getHeaderField("content-range");

            if (connectionField != null) {
                String[] connectionRanges = connectionField.substring("bytes=".length()).split("-");
                downloadedSize = Long.valueOf(connectionRanges[0]);
            }

            if (connectionField == null && file.exists())
                file.delete();

            fileLength = connection.getContentLength() + downloadedSize;
            BufferedInputStream input = new BufferedInputStream(connection.getInputStream());
            RandomAccessFile output = new RandomAccessFile(file, "rw");
            output.seek(downloadedSize);

            byte data[] = new byte[1024];
            int count = 0;
            int __progress = 0;

            while ((count = input.read(data, 0, 1024)) != -1 && __progress != 100) {
                downloadedSize += count;
                output.write(data, 0, count);
                __progress = (int) ((downloadedSize * 100) / fileLength);
            }

            output.close();
            input.close();

        }

    } catch (Exception e) {
        e.printStackTrace();
        return false;
    }
    return false;

}

From source file:org.wso2.carbon.identity.authenticator.mobileconnect.MobileConnectAuthenticator.java

/**
 * Read the discovery API endpoint connections.
 *///from   w  w  w. j a v  a 2s  .c o  m
private void discoveryEndpointRead(AuthenticationContext context, HttpServletResponse response,
        HttpURLConnection connection) throws JSONException, AuthenticationFailedException {

    try {

        //get response from HttpURLConnection
        int responseCode = connection.getResponseCode();
        //if 200 OK
        if (responseCode == 200) {

            //read the response sent by the server
            BufferedReader reader = new BufferedReader(
                    new InputStreamReader(connection.getInputStream(), StandardCharsets.UTF_8));
            StringBuilder stringBuilder = new StringBuilder();
            String line;
            while ((line = reader.readLine()) != null) {
                stringBuilder.append(line);
            }
            String responseString = stringBuilder.toString();
            reader.close();
            //create JSON object using the String retrieved
            JSONObject jsonObject = new JSONObject(responseString);
            //add the JSON object to the context of the session
            context.setProperty(MobileConnectAuthenticatorConstants.MOBILE_CONNECT_DISCOVERY_JSON_OBJECT,
                    jsonObject);
            //let the context know the end of the Discovery Process, and ste it to Authorization
            context.setProperty(MobileConnectAuthenticatorConstants.MOBILE_CONNECT_FLOW_STATUS,
                    MobileConnectAuthenticatorConstants.MOBILE_CONNECT_AUTHORIZATION_ENDPOINT);
            log.info("MSISDN is valid. Discovery Endpoint authorization successful");

        } else if (responseCode == 302) {
            //if 302, move temporarily
            String redirectUrl = connection.getHeaderField("location");
            //retrieve the redirect URL and redirect the flow
            response.sendRedirect(redirectUrl);
            context.setProperty(MobileConnectAuthenticatorConstants.MOBILE_CONNECT_FLOW_STATUS,
                    MobileConnectAuthenticatorConstants.MOBILE_CONNECT_AUTHORIZATION_ENDPOINT);
            log.info("MSISDN is invalid. Redirecting to mobile connect interface");

        } else if (responseCode == 401) {
            //if 401 unauthorized
            String retryURL = ConfigurationFacade.getInstance().getAuthenticationEndpointRetryURL();
            //redirect to retry URL
            response.sendRedirect(retryURL);
            log.error("No Authorization or Bad Session");

        } else if (responseCode == 404 || responseCode == 400) {
            //if 404, not found
            String retryURL = ConfigurationFacade.getInstance().getAuthenticationEndpointRetryURL();
            //redirect to retry URL
            response.sendRedirect(retryURL);
            log.error("Bad MSISDN is supplied");
        }

    } catch (IOException e) {
        throw new AuthenticationFailedException("response redirection failed", e);
    }

}

From source file:com.google.ytd.SubmitActivity.java

private String uploadMetaData(String filePath, boolean retry) throws IOException {
    String uploadUrl = INITIAL_UPLOAD_URL;

    HttpURLConnection urlConnection = getGDataUrlConnection(uploadUrl);
    urlConnection.setRequestMethod("POST");
    urlConnection.setDoOutput(true);/*from ww w .  j  a v a 2s  .  c  o m*/
    urlConnection.setRequestProperty("Content-Type", "application/atom+xml");
    urlConnection.setRequestProperty("Slug", filePath);
    String atomData;

    String title = getTitleText();
    String description = getDescriptionText();
    String category = DEFAULT_VIDEO_CATEGORY;
    this.tags = DEFAULT_VIDEO_TAGS;

    if (!Util.isNullOrEmpty(this.getTagsText())) {
        this.tags = this.getTagsText();
    }

    if (this.videoLocation == null) {
        String template = Util.readFile(this, R.raw.gdata).toString();
        atomData = String.format(template, title, description, category, this.tags);
    } else {
        String template = Util.readFile(this, R.raw.gdata_geo).toString();
        atomData = String.format(template, title, description, category, this.tags, videoLocation.getLatitude(),
                videoLocation.getLongitude());
    }

    OutputStreamWriter outStreamWriter = new OutputStreamWriter(urlConnection.getOutputStream());
    outStreamWriter.write(atomData);
    outStreamWriter.close();

    int responseCode = urlConnection.getResponseCode();
    if (responseCode < 200 || responseCode >= 300) {
        // The response code is 40X
        if ((responseCode + "").startsWith("4") && retry) {
            Log.d(LOG_TAG, "retrying to fetch auth token for " + youTubeName);
            this.clientLoginToken = authorizer.getFreshAuthToken(youTubeName, clientLoginToken);
            // Try again with fresh token
            return uploadMetaData(filePath, false);
        } else {
            throw new IOException(String.format("response code='%s' (code %d)" + " for %s",
                    urlConnection.getResponseMessage(), responseCode, urlConnection.getURL()));
        }
    }

    return urlConnection.getHeaderField("Location");
}

From source file:com.centurylink.mdw.util.HttpHelper.java

/**
 * Populates the response member.  Closes the connection.
 *///w w w . java  2s  .c om
private void readInput(HttpURLConnection connection) throws IOException {
    InputStream is = null;
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    try {
        byte[] buffer = new byte[2048];
        try {
            is = connection.getInputStream();
            while (maxBytes == -1 || baos.size() < maxBytes) {
                int bytesRead = is.read(buffer);
                if (bytesRead == -1)
                    break;
                baos.write(buffer, 0, bytesRead);
            }
            response = baos.toByteArray();
            if (followHtmlHeadMetaRefresh && getResponse().indexOf("http-equiv") > 0) {
                try {
                    redirect = parseResponseForHtmlMetaEquiv(getResponse());
                    if (redirect != null)
                        response = new HttpHelper(this, redirect).getBytes();
                } catch (Exception ex) {
                    throw new IllegalArgumentException("Unparseable response: " + ex.getMessage(), ex);
                }

            }
        } catch (IOException ex) {
            InputStream eis = null;
            try {
                eis = connection.getErrorStream();
                while (maxBytes == -1 || baos.size() < maxBytes) {
                    int bytesRead = eis.read(buffer);
                    if (bytesRead == -1)
                        break;
                    baos.write(buffer, 0, bytesRead);
                }
                response = baos.toByteArray();
            } catch (Exception ex2) {
                // throw original exception
            } finally {
                if (eis != null) {
                    eis.close();
                }
            }
            throw ex;
        }
    } finally {
        if (is != null)
            is.close();
        connection.disconnect();
        responseCode = connection.getResponseCode();
        responseMessage = connection.getResponseMessage();
        headers = new HashMap<String, String>();
        for (String headerKey : connection.getHeaderFields().keySet()) {
            if (headerKey == null)
                headers.put("HTTP", connection.getHeaderField(headerKey));
            else
                headers.put(headerKey, connection.getHeaderField(headerKey));
        }
    }
}

From source file:org.eclipse.che.api.builder.internal.SourcesManagerImpl.java

private void download(String downloadUrl, java.io.File downloadTo) throws IOException {
    HttpURLConnection conn = null;
    try {//ww  w .j a v a 2  s . c  o m
        final LinkedList<java.io.File> q = new LinkedList<>();
        q.add(downloadTo);
        final long start = System.currentTimeMillis();
        final List<Pair<String, String>> md5sums = new LinkedList<>();
        while (!q.isEmpty()) {
            java.io.File current = q.pop();
            java.io.File[] list = current.listFiles();
            if (list != null) {
                for (java.io.File f : list) {
                    if (f.isDirectory()) {
                        q.push(f);
                    } else {
                        md5sums.add(Pair.of(com.google.common.io.Files.hash(f, Hashing.md5()).toString(),
                                downloadTo.toPath().relativize(f.toPath()).toString().replace("\\", "/"))); //Replacing of "\" is need for windows support
                    }
                }
            }
        }
        final long end = System.currentTimeMillis();
        if (md5sums.size() > 0) {
            LOG.debug("count md5sums of {} files, time: {}ms", md5sums.size(), (end - start));
        }
        conn = (HttpURLConnection) new URL(downloadUrl).openConnection();
        conn.setConnectTimeout(CONNECT_TIMEOUT);
        conn.setReadTimeout(READ_TIMEOUT);
        final EnvironmentContext context = EnvironmentContext.getCurrent();
        if (context.getUser() != null && context.getUser().getToken() != null) {
            conn.setRequestProperty(HttpHeaders.AUTHORIZATION, context.getUser().getToken());
        }
        if (!md5sums.isEmpty()) {
            conn.setRequestMethod(HttpMethod.POST);
            conn.setRequestProperty("Content-type", MediaType.TEXT_PLAIN);
            conn.setRequestProperty(HttpHeaders.ACCEPT, MediaType.MULTIPART_FORM_DATA);
            conn.setDoOutput(true);
            try (OutputStream output = conn.getOutputStream(); Writer writer = new OutputStreamWriter(output)) {
                for (Pair<String, String> pair : md5sums) {
                    writer.write(pair.first);
                    writer.write(' ');
                    writer.write(pair.second);
                    writer.write('\n');
                }
            }
        }
        final int responseCode = conn.getResponseCode();
        if (responseCode == HttpURLConnection.HTTP_OK) {
            final String contentType = conn.getHeaderField("content-type");
            if (contentType.startsWith(MediaType.MULTIPART_FORM_DATA)) {
                final HeaderParameterParser headerParameterParser = new HeaderParameterParser();
                final String boundary = headerParameterParser.parse(contentType).get("boundary");
                try (InputStream in = conn.getInputStream()) {
                    MultipartStream multipart = new MultipartStream(in, boundary.getBytes());
                    boolean hasMore = multipart.skipPreamble();
                    while (hasMore) {
                        final Map<String, List<String>> headers = parseChunkHeader(
                                CharStreams.readLines(new StringReader(multipart.readHeaders())));
                        final List<String> contentDisposition = headers.get("content-disposition");
                        final String name = headerParameterParser.parse(contentDisposition.get(0)).get("name");
                        if ("updates".equals(name)) {
                            int length = -1;
                            List<String> contentLengthHeader = headers.get("content-length");
                            if (contentLengthHeader != null && !contentLengthHeader.isEmpty()) {
                                length = Integer.parseInt(contentLengthHeader.get(0));
                            }
                            if (length < 0 || length > 204800) {
                                java.io.File tmp = java.io.File.createTempFile("tmp", ".zip", directory);
                                try {
                                    try (FileOutputStream fOut = new FileOutputStream(tmp)) {
                                        multipart.readBodyData(fOut);
                                    }
                                    ZipUtils.unzip(tmp, downloadTo);
                                } finally {
                                    if (tmp.exists()) {
                                        tmp.delete();
                                    }
                                }
                            } else {
                                final ByteArrayOutputStream bOut = new ByteArrayOutputStream(length);
                                multipart.readBodyData(bOut);
                                ZipUtils.unzip(new ByteArrayInputStream(bOut.toByteArray()), downloadTo);
                            }
                        } else if ("removed-paths".equals(name)) {
                            final ByteArrayOutputStream bOut = new ByteArrayOutputStream();
                            multipart.readBodyData(bOut);
                            final String[] removed = JsonHelper.fromJson(
                                    new ByteArrayInputStream(bOut.toByteArray()), String[].class, null);
                            for (String path : removed) {
                                java.io.File f = new java.io.File(downloadTo, path);
                                if (!f.delete()) {
                                    throw new IOException(String.format("Unable delete %s", path));
                                }
                            }
                        } else {
                            // To /dev/null :)
                            multipart.readBodyData(DEV_NULL);
                        }
                        hasMore = multipart.readBoundary();
                    }
                }
            } else {
                try (InputStream in = conn.getInputStream()) {
                    ZipUtils.unzip(in, downloadTo);
                }
            }
        } else if (responseCode != HttpURLConnection.HTTP_NO_CONTENT) {
            throw new IOException(
                    String.format("Invalid response status %d from remote server. ", responseCode));
        }
    } catch (ParseException | JsonParseException e) {
        throw new IOException(e.getMessage(), e);
    } finally {
        if (conn != null) {
            conn.disconnect();
        }
    }
}