build POST request which has multipart body (String and Image)

build POST using Apache HttpComponents

	private HttpPost buildPostRequest(String _method, String _path, Map _params)
			throws ServerConnectionException {

		HttpPost request = new HttpPost();
		try {
			request.setURI(URIUtils.createURI(scheme, host, port, _path, null,
					null));

			MultipartEntity entity = new MultipartEntity(
					HttpMultipartMode.BROWSER_COMPATIBLE);

			for (Iterator it = _params.keySet().iterator(); it.hasNext();) {
				String key = (String) it.next();
				if (_params.get(key) instanceof File) {
					FileBody fileBody = new FileBody((File) _params.get(key));
					entity.addPart(key, fileBody);
				} else {
					entity.addPart(key,
							new StringBody((String) _params.get(key)));
				}
			}
			request.setEntity(entity);
		} catch (Exception e) {
			new ServerConnectionException(e);
		}
		return request;
	}