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如果我使用此代码的特定网址，然后它的工作，但如果我改变完全相同的类型的网址那么是否有必要更改getRequest.setHeader("User-Agent", "xxxx") (other than xxxx)或它不会导致任何问题？我们是否需要更改标题？
DefaultHttpClient client = new DefaultHttpClient();
String getUrl = "http://myurl.com";
HttpUriRequest getRequest = new HttpGet(getUrl);
getRequest.setHeader("User-Agent", "xxxx");
HttpResponse response = client.execute(getRequest);
int statusCode = response.getStatusLine().getStatusCode();
log.info("statusCode=" + statusCode);
Document doc = null;
if (statusCode == 200){
HttpEntity entity = response.getEntity();
//String content = EntityUtils.toString(entity);
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
try {
DocumentBuilder builder = factory.newDocumentBuilder();
doc = builder.parse(entity.getContent());
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
}
}