java爬虫：httpClient发起请求时报ClientProtocolException的错误

Question

背景： java爬虫抓取某保险网站的数据。 问题： 在模拟登录之后，对目标页面发起请求时报错。 登陆成功。。。。。 org.apache.http.client.ClientProtocolException at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:186) at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82) at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:107) at spider.SimulatePALogin.afterLoginPager(SimulatePALogin.java:92) at spider.SimulatePALogin.main(SimulatePALogin.java:41) Caused by: org.apache.http.ProtocolException: Content-Length header already present at org.apache.http.protocol.RequestContent.process(RequestContent.java:96) at org.apache.http.protocol.ImmutableHttpProcessor.process(ImmutableHttpProcessor.java:132) at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:182) at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88) at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110) at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184) ... 4 more Process finished with exit code 0 出错代码位置： HttpUriRequest httpUriRequest = new HttpPost( "https://icore-pts.pingan.com.cn/ebusiness/login"); // ?Accept?: application/json, text/javascript, */*; q=0.01 httpUriRequest.setHeader("Host","pacas-login.pingan.com.cn"); //...... set headers here httpUriRequest.setHeader("Upgrade-Insecure-Requests","1"); httpUriRequest .setHeader( "User-Agent", "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.89 Safari/537.36"); // 报错位置 HttpResponse response = HttpUtils.httpClient.execute(httpUriRequest); 初接触爬虫，请问各位大大为什么会出错？求指教！！ 先在此谢过。

Answer 1

Caused by: org.apache.http.ProtocolException: Content-Length header already present

你是不是指定 Content-Length 头了