通过httpclient发送请求到其它资源，把请求响应的内容转给httpServletResponse
public void testData(HttpServletResponse response) {
HttpResponse httpResponse = null;
try {
// 请求外部资源
httpResponse = Request.Get(url).connectTimeout(30000).execute().returnResponse();
HttpEntity entity = httpResponse.getEntity();
// 这里还可以设置响应头
// 把外部资源响应的内容传到HttpServletResponse中去
entity.writeTo(response.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
}
}
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