Java HTTP Builder/Groovy-丢失302（重定向）处理？

我在这里看书 “在响应发送重定向状态代码的情况下，这由Apache HttpClient内部处理，默认情况下，它只需在重定向之后将请求重新发送到新的URL。您无需执行任何特殊操作即可跟踪302响应。”

当我只使用get（）或post（）方法而不使用闭包时，这似乎很好

然而，当我使用闭包时，我似乎失去了302处理。有什么办法我可以自己处理吗？多谢各位

p、 这是我的日志输出，显示它是302响应

 [java] FINER: resp.statusLine: "HTTP/1.1 302 Found"

以下是相关代码：

// Copyright (C) 2010 Misha Koshelev. All Rights Reserved.
package com.mksoft.fbbday.main

import groovyx.net.http.ContentType

import java.util.logging.Level
import java.util.logging.Logger

class HTTPBuilder {
  def dataDirectory
  HTTPBuilder(dataDirectory) {
    this.dataDirectory=dataDirectory
  }

  // Main logic
  def logger=Logger.getLogger(this.class.name)
  def closure={resp,reader->
    logger.finer("resp.statusLine: \"${resp.statusLine}\"")
    if (logger.isLoggable(Level.FINEST)) {
      def respHeadersString='Headers:';
      resp.headers.each() { header->respHeadersString+="\n\t${header.name}=\"${header.value}\"" }
      logger.finest(respHeadersString)
    }

    def text=reader.text
    def lastHtml=new File("${dataDirectory}${File.separator}last.html")
    if (lastHtml.exists()) {
      lastHtml.delete()
    }
    lastHtml<<text
    new XmlSlurper(new org.cyberneko.html.parsers.SAXParser()).parseText(text)          
  }
  def processArgs(args) {
    if (logger.isLoggable(Level.FINER)) {
      def argsString='Args:';
      args.each() { arg->argsString+="\n\t${arg.key}=\"${arg.value}\"" }
      logger.finer(argsString)
    }
    args.contentType=groovyx.net.http.ContentType.TEXT
    args
  }

  // HTTPBuilder methods
  def httpBuilder=new groovyx.net.http.HTTPBuilder ()
  def get(args) {
    httpBuilder.get(processArgs(args),closure)
  }
  def post(args) {
    args.contentType=groovyx.net.http.ContentType.TEXT
    httpBuilder.post(processArgs(args),closure) 
  }
}

以下是相关日志：

FINE: Receiving response: HTTP/1.1 302 Found
Jun 4, 2010 4:37:22 PM org.apache.http.impl.conn.DefaultClientConnection receiveResponseHeader
FINE: << HTTP/1.1 302 Found
Jun 4, 2010 4:37:22 PM org.apache.http.impl.conn.DefaultClientConnection receiveResponseHeader
FINE: << Cache-Control: private, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Jun 4, 2010 4:37:22 PM org.apache.http.impl.conn.DefaultClientConnection receiveResponseHeader
FINE: << Expires: Sat, 01 Jan 2000 00:00:00 GMT
Jun 4, 2010 4:37:22 PM org.apache.http.impl.conn.DefaultClientConnection receiveResponseHeader
FINE: << Location: http://www.facebook.com/home.php?
Jun 4, 2010 4:37:22 PM org.apache.http.impl.conn.DefaultClientConnection receiveResponseHeader
FINE: << P3P: CP="DSP LAW"
Jun 4, 2010 4:37:22 PM org.apache.http.impl.conn.DefaultClientConnection receiveResponseHeader
FINE: << Pragma: no-cache
Jun 4, 2010 4:37:22 PM org.apache.http.impl.conn.DefaultClientConnection receiveResponseHeader
FINE: << Set-Cookie: datr=1275687438-9ff6ae60a89d444d0fd9917abf56e085d370277a6e9ed50c1ba79; expires=Sun, 03-Jun-2012 21:37:24 GMT; path=/; domain=.facebook.com
Jun 4, 2010 4:37:22 PM org.apache.http.impl.conn.DefaultClientConnection receiveResponseHeader
FINE: << Set-Cookie: lxe=koshelev%40post.harvard.edu; expires=Tue, 28-Sep-2010 15:24:04 GMT; path=/; domain=.facebook.com; httponly
Jun 4, 2010 4:37:22 PM org.apache.http.impl.conn.DefaultClientConnection receiveResponseHeader
FINE: << Set-Cookie: lxr=deleted; expires=Thu, 04-Jun-2009 21:37:23 GMT; path=/; domain=.facebook.com; httponly
Jun 4, 2010 4:37:22 PM org.apache.http.impl.conn.DefaultClientConnection receiveResponseHeader
FINE: << Set-Cookie: pk=183883c0a9afab1608e95d59164cc7dd; path=/; domain=.facebook.com; httponly
Jun 4, 2010 4:37:22 PM org.apache.http.impl.conn.DefaultClientConnection receiveResponseHeader
FINE: << Content-Type: text/html; charset=utf-8
Jun 4, 2010 4:37:22 PM org.apache.http.impl.conn.DefaultClientConnection receiveResponseHeader
FINE: << X-Cnection: close
Jun 4, 2010 4:37:22 PM org.apache.http.impl.conn.DefaultClientConnection receiveResponseHeader
FINE: << Date: Fri, 04 Jun 2010 21:37:24 GMT
Jun 4, 2010 4:37:22 PM org.apache.http.impl.conn.DefaultClientConnection receiveResponseHeader
FINE: << Content-Length: 0
Jun 4, 2010 4:37:22 PM org.apache.http.client.protocol.ResponseProcessCookies processCookies
FINE: Cookie accepted: "[version: 0][name: datr][value: 1275687438-9ff6ae60a89d444d0fd9917abf56e085d370277a6e9ed50c1ba79][domain: .facebook.com][path: /][expiry: Sun Jun 03 16:37:24 CDT 2012]". 
Jun 4, 2010 4:37:22 PM org.apache.http.client.protocol.ResponseProcessCookies processCookies
FINE: Cookie accepted: "[version: 0][name: lxe][value: koshelev%40post.harvard.edu][domain: .facebook.com][path: /][expiry: Tue Sep 28 10:24:04 CDT 2010]". 
Jun 4, 2010 4:37:22 PM org.apache.http.client.protocol.ResponseProcessCookies processCookies
FINE: Cookie accepted: "[version: 0][name: lxr][value: deleted][domain: .facebook.com][path: /][expiry: Thu Jun 04 16:37:23 CDT 2009]". 
Jun 4, 2010 4:37:22 PM org.apache.http.client.protocol.ResponseProcessCookies processCookies
FINE: Cookie accepted: "[version: 0][name: pk][value: 183883c0a9afab1608e95d59164cc7dd][domain: .facebook.com][path: /][expiry: null]". 
Jun 4, 2010 4:37:22 PM org.apache.http.impl.client.DefaultRequestDirector execute
FINE: Connection can be kept alive indefinitely
Jun 4, 2010 4:37:22 PM groovyx.net.http.HTTPBuilder doRequest
FINE: Response code: 302; found handler: post302$_run_closure2@7023d08b
Jun 4, 2010 4:37:22 PM groovyx.net.http.HTTPBuilder doRequest
FINEST: response handler result: null
Jun 4, 2010 4:37:22 PM org.apache.http.impl.conn.SingleClientConnManager releaseConnection
FINE: Releasing connection org.apache.http.impl.conn.SingleClientConnManager$ConnAdapter@605b28c9

FINE:接收响应：找到HTTP/1.1 302
2010年6月4日下午4:37:22 org.apache.http.impl.conn.DefaultClientConnection接收方负责人
很好：处理302响应时，您会看到哪些其他头？如果您要打开，您会看到HttpClient处理302响应，并在
位置
标题中自动请求URL。当您处理该URL时，您看到了什么？它适用于任何URL吗

试试看（它现在重定向到Oracle。）我只是想知道你正在使用的服务器是否在做一些不可靠的事情，比如发送一个没有位置头的302
 在我意识到这一点之前，我对HTTPBuilder也有同样的问题

重定向3xx

[……]
此类状态代码表示
需要进一步采取行动

由用户代理执行，以便
满足要求。行动

所需的测试可由
不与用户交互的用户代理
当且仅当方法
在第二个请求中使用的是GET
或者头部

302发现

[……]
如果收到302状态代码以响应其他请求
而不是GET或HEAD，用户代理不能自动重定向
请求，除非用户可以确认，因为这可能
更改发出请求的条件

本质上，这意味着POST和302重定向之后的请求不会自动工作，如果HTTP/1.1规范后面跟着字母，则需要用户干预。并非所有Http客户机都遵循这种做法，事实上大多数浏览器都不这么做。但是，Apache Http客户端（它是HttpBuilder的底层Http客户端）。有一个包含更多信息和问题可能解决方案的示例

void test_myPage_shouldRedirectToLogin() {
  def baseURI = "http://servername"
  def httpBuilder = new HTTPBuilder(baseURI)
  // Make sure that HttpClient doesn't perform a redirect
  def dontHandleRedirectStrategy = [
    getRedirect : { request, response, context -> null},
    isRedirected : { request, response, context -> false}
  ]
  httpBuilder.client.setRedirectStrategy(dontHandleRedirectStrategy as RedirectStrategy)

  // Execute a GET request and expect a redirect
  httpBuilder.request(Method.GET, ContentType.TEXT) {
    req ->
      uri.path = '/webapp/de/de/myPage'
      response.success = { response, reader ->
        assertThat response.statusLine.statusCode, is(302)
        assertThat response.headers['Location'].value, startsWith("${baseURI}/webapp/login")
      }
      response.failure = { response, reader ->
        fail("Expected redirect but received ${response.statusLine} \n ${reader}")
      }
    }
  }

302状态即将出现，因为在HttpBuilder未遵循任何链接重定向url的操作后，我们需要明确添加“重定向策略”。
实际上我查看了www.sun.com。这是一个301。misha@misha-d630:/tmp$telnet www.sun.com 80.137.254.16.57。。。已连接到www.sun.com。转义字符为“^]”。GET/HTTP/1.1 HTTP/1.1 301永久移动服务器：Sun Java System Web Server/7.0日期：2010年6月4日星期五21:36:01 GMT P3p:policyref=“”，CP=“CAO DSP COR CUR ADMa DEVa TAIa PSAa PSDa CONi TELi我们的SAMi PUBi IND PHY ONL PUR COM导航国际数据中心STA POL PRE GOV”位置：连接：关闭
void test_myPage_shouldRedirectToLogin() {
  def baseURI = "http://servername"
  def httpBuilder = new HTTPBuilder(baseURI)
  // Make sure that HttpClient doesn't perform a redirect
  def dontHandleRedirectStrategy = [
    getRedirect : { request, response, context -> null},
    isRedirected : { request, response, context -> false}
  ]
  httpBuilder.client.setRedirectStrategy(dontHandleRedirectStrategy as RedirectStrategy)

  // Execute a GET request and expect a redirect
  httpBuilder.request(Method.GET, ContentType.TEXT) {
    req ->
      uri.path = '/webapp/de/de/myPage'
      response.success = { response, reader ->
        assertThat response.statusLine.statusCode, is(302)
        assertThat response.headers['Location'].value, startsWith("${baseURI}/webapp/login")
      }
      response.failure = { response, reader ->
        fail("Expected redirect but received ${response.statusLine} \n ${reader}")
      }
    }
  }