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hi 

i'd like to let user read pdf when they click icon

<liferay-ui:icon image="news" message="<%=buttonNameDocInfo%>"  url="http://external/?doc=xxx />

it works.

but i'd like to know, how to do it via actionrequest. i changed my code

<portlet:actionURL var="efgpExportDocFunctionURL" name="exportDoc">
	<portlet:param name="<%=Constant.EFGP_EXPORT_DOC_NO%>" value="<%=docInfoVO.getDocNo()%>" />
</portlet:actionURL>

<liferay-ui:icon image="news" message="<%=buttonNameDocInfo%>"  url="<%=efgpExportDocFunctionURL.toString() %>" />

	public void exportDoc(ActionRequest actionRequest, ActionResponse actionResponse) throws PortletException, IOException {
		StringBuffer messageSB = new StringBuffer();
		User currentUser = (User) actionRequest.getAttribute(WebKeys.USER);
		String docNo = ParamUtil.getString(actionRequest, Constant.EFGP_EXPORT_DOC_NO);
		try {
			StringBuffer docLink = new StringBuffer();
			docLink.append("http://").append(Constant.EFGP_DOC_SERVER).append("/?docNumber=").append(docNo);
			LOGGER.info(docLink.toString());
			HttpClient httpClient = HttpClients.createDefault();
			HttpGet httpGet = new HttpGet(docLink.toString());
			HttpResponse responset = httpClient.execute(httpGet);
			HttpEntity entity = responset.getEntity();
			HttpServletResponse response = PortalUtil.getHttpServletResponse(actionResponse);
			response.setContentType(Constant.HTTP_HEADERS_CONTENT_TYPE_APPLICATION_PDF);
			response.setHeader(HttpHeaders.CONTENT_DISPOSITION, Constant.HTTP_HEADERS_CONTENT_DISPOSITION_CONTENT_PREFIX_ATTACHMENT_FILENAME + StringPool.QUOTE + docNo + ".PDF" + StringPool.QUOTE);
			OutputStream out = response.getOutputStream();
			entity.writeTo(out);
			out.flush();
			out.close();
		} catch (Exception ex) {
			LOGGER.equals(ex);
			messageSB.append("hit exception:").append(ex.getClass().getName()).append(" message:").append(ex.getMessage()).append(Constant.HTML_SNAP);
			SessionErrors.add(actionRequest, ex.getClass().getName(), ex);
		}
	}

but it doesn't work, it seens get the file already, but in borwser, it shows

please let me know how to make it right or any suggestion, thank you very much in advance.