User agent: user agent. It is a kind of identification that provides information such as browser type, operating system and version, CPU type, browser rendering engine, browser language, browser plug-in, etc. The UA string is sent to the server every time the browser makes an HTTP request
Referer: http referer is a part of the header. When a browser sends a request to a web server, it usually brings a referer to tell the server which page I’m linking from, so that the server can get some information for processing
public static String getHtmls(String url) throws IOException {
RequestConfig globalConfig = RequestConfig.custom().setCookieSpec(CookieSpecs.IGNORE_COOKIES).build();
String html = "";
CloseableHttpClient httpClient = HttpClients.custom().setDefaultRequestConfig(globalConfig).build();
HttpGet httpget = new HttpGet(url);
//Browser identifier (OS identifier; encryption level identifier; browser language) Rendering engine identifier Version information
httpget.setHeader("User-Agent","Mozilla/5.0 (Linux; U; Android 2.3.6; zh-cn; GT-S5660 Build/GINGERBREAD) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1 MicroMessenger/4.5.255");
// Camouflage head
httpget.setHeader("Referer", "https://mp.weixin.qq.com");
try {
HttpResponse responce = httpClient.execute(httpget);//
int resStatu = responce.getStatusLine().getStatusCode();
if (resStatu == HttpStatus.SC_OK) {
HttpEntity entity = responce.getEntity();
if (entity != null) {
html = EntityUtils.toString(entity);// Get html source code
}
}
} catch (Exception e) {
System.out.println("request " + url + " error!");
e.printStackTrace();
} finally {
// close
httpClient.close();
}
return html;
}