好的，这将是一个长篇，所以感谢所有阅读到最后的人。
前提条件：我无法访问服务器，我只是想将数据作为新闻评论发布。
我现在拼命地测试了几个小时，但我仍然没有任何成功。我基本上需要的是这种请求：
POST http://www.example.com/gen/processtalkback.php
Cookie: userid=XXXX; password=XXXX
Content-Type: application/x-www-form-urlencoded
reference_id=XXXX&talkback_command=newentry&talkback_content=comment&talkback_viewpage=1&reference_area=11
所以没什么特别的，只有两个带有两个 cookie 和一个内容描述符和五个参数的标题。这两个 cookie 是强制性的，所以我这样设置它们：
CookieStore cookieStore = httpClient.getCookieStore();
BasicClientCookie cookie = new BasicClientCookie("userid", "XXXX");
cookie.setDomain("http://www.example.com");
cookieStore.addCookie(cookie);
BasicClientCookie cookie2 = new BasicClientCookie("password", "XXXX");
cookie2.setDomain("http://www.example.com");
cookieStore.addCookie(cookie2);
之后，我将标头和内容设置为 HttpPost 对象并执行它：
HttpPost httpost = new HttpPost("http://www.example.com/gen/processtalkback.php");
httpost.setHeader("Content-Type", "application/x-www-form-urlencoded");
List<NameValuePair> nvps = new ArrayList<NameValuePair>(5);
nvps.add(new BasicNameValuePair("reference_id", "XXXX"));
...
httpost.setEntity(new UrlEncodedFormEntity(nvps));
HttpResponse httpResponse = httpClient.execute(httpost);
我查看了回复，它告诉我：
Log.i("RESPONSE", httpResponseActivity.getStatusLine() + EntityUtils.toString(httpResponse .getEntity()));
HTTP/1.1 417 Expectation Failed
<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>417 - Expectation Failed</title>
</head>
<body>
<h1>417 - Expectation Failed</h1>
</body>
</html>
我真的不知道问题是什么。使用诸如“海报”或“HttpRequester”之类的 Firefox 扩展，我成功发布了：
POST http://www.example.com/gen/processtalkback.php
Cookie: userid=XXXX; password=XXXX
Content-Type: application/x-www-form-urlencoded
reference_id=XXXX&talkback_command=newentry&talkback_content=comment&talkback_viewpage=1&reference_area=11
200 OK
X-Powered-By: PHP/5.3.6
Set-Cookie: ...
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Content-Type: text/html; charset=utf-8
Transfer-Encoding: chunked
Date: Sun, 07 Aug 2011 16:24:01 GMT
Server: lighttpd/1.4.22
<a name="commentanchor"></a>
...
我也用 Parameter 对象尝试过，但仍然没有成功：
HttpParams params = new BasicHttpParams();
params.setParameter("reference_id", "XXXX");
...
httpost.setParams(params);
问题的原因可能是什么？我错过了什么吗？我不知道的任何 Apache HttpClient 细节？我知道服务器通过这次失败告诉我一些事情，所以我在网上搜索并尝试了解决方案之一：
params.setBooleanParameter("http.protocol.expect-continue", false);
仍然没有成功。
在没有此参数的情况下，我从“shark for root”应用程序的窃听中得到了什么：
Data:
POST /gen/processtalkback.php
HTTP/1.1
Content-Type: application/x-www-form-urlencoded
Content-Length: 119
Host: www.example.com
Connection: Keep-Alive
User-Agent: Apache-HttpClient/UNAVAILABLE (java 1.4)
Expect: 100-Continue
HEX: .....
现在使用参数：
Data:
POST /gen/processtalkback.php
HTTP/1.1
Content-Type: application/x-www-form-urlencoded
Content-Length: 119
Host: www.example.com
Connection: Keep-Alive
User-Agent: Apache-HttpClient/UNAVAILABLE (java 1.4)
reference_id=XXXX...............
HEX: .....
我通过浏览器发布的萤火虫得到了什么：
Host www.example.de
User-Agent Mozilla/5.0
Accept text/javascript, text/html, application/xml, text/xml, */*
Accept-Language en-us,de-de;q=0.8,en;q=0.5,de;q=0.3
Accept-Encoding gzip, deflate
Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7
DNT 1
Connection keep-alive
X-Requested-With XMLHttpRequest
X-Prototype-Version 1.7
Content-Type application/x-www-form-urlencoded; charset=UTF-8
Referer ...
Content-Length 134
Cookie ...
Pragma no-cache
Cache-Control no-cache
为什么我的程序化 httppost 尝试中不会显示 cookie？如果有人有想法，那就太棒了。:-)