1、httpPost 设置header,header内容是在发送请求的头文件里面
HttpPost httpPost = new HttpPost(url);如：Accept text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8Accept-Encoding gzip, deflateAccept-Language zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
2、StringEntity 设置header,header内容是在发送的内容里面
StringEntity stringEntity = new StringEntity(data, ToolString.encoding);如：<!DOCTYPE html><html id="spLianghui"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
3、HttpResponse 设置header,header内容是在获取返回信息的头文件里面
HttpResponse response = httpClient.execute(httpPost);
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