我在这里读书 http://groovy.codehaus.org/modules/http-builder/doc/handlers.html “在响应发送重定向状态代码的情况下，这是由 Apache HttpClient 内部处理的，默认情况下，它会通过将请求重新发送到新 URL 来简单地遵循重定向。您不需要做任何特殊的事情来关注 302 回复。”

当我只使用没有闭包的 get() 或 post() 方法时，这似乎工作正常。

但是，当我使用闭包时，我似乎失去了 302 处理。有什么方法可以让我自己处理吗？谢谢

附注这是我的日志输出，显示它是 302 响应

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

相关代码如下:

// 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) 
  }
}

这是一个特定的测试器:

#!/usr/bin/env groovy

import groovyx.net.http.HTTPBuilder
import groovyx.net.http.Method
import static groovyx.net.http.ContentType.URLENC

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

// MUST ENTER VALID FACEBOOK EMAIL AND PASSWORD BELOW !!!
def email=''
def pass=''

// Remove default loggers
def logger=Logger.getLogger('')
def handlers=logger.handlers
handlers.each() { handler->logger.removeHandler(handler) }

// Log ALL to Console
logger.setLevel Level.ALL
def consoleHandler=new ConsoleHandler()
consoleHandler.setLevel Level.ALL
logger.addHandler(consoleHandler)

// Facebook - need to get main page to capture cookies
def http = new HTTPBuilder()
http.get(uri:'http://www.facebook.com')

// Login
def html=http.post(uri:'https://login.facebook.com/login.php?login_attempt=1',body:[email:email,pass:pass])
assert html==null

// Why null?
html=http.post(uri:'https://login.facebook.com/login.php?login_attempt=1',body:[email:email,pass:pass]) { resp,reader->
  assert resp.statusLine.statusCode==302

  // Shouldn't we be redirected???
  // http://groovy.codehaus.org/modules/http-builder/doc/handlers.html
  // "In cases where a response sends a redirect status code, this is handled internally by Apache HttpClient, which by default will simply follow the redirect by re-sending the request to the new URL. You do not need to do anything special in order to follow 302 responses. "
}

相关日志如下:

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

你可以清楚地看到有一个位置参数。

谢谢 米莎

最佳答案

在我意识到 the HTTP/1.1 spec states: 之前，我在使用 HTTPBuilder 时遇到了同样的问题。

Redirection 3xx

[..] This class of status code indicates that further action needs to be
taken by the user agent in order to fulfill the request. The action
required MAY be carried out by the user agent without interaction with the user if and only if the method used in the second request is GET or HEAD.

302 Found

[..] If the 302 status code is received in response to a request other than GET or HEAD, the user agent MUST NOT automatically redirect the request unless it can be confirmed by the user, since this might change the conditions under which the request was issued.

从本质上讲，这意味着 POST 和 302 重定向后的请求不会自动工作，如果 HTTP/1.1 规范后跟字母，则需要用户干预。并不是所有的 Http 客户端都遵循这种做法，事实上大多数浏览器都没有。但是 Apache Http 客户端(它是 HttpBuilder 的底层 Http 客户端)is spec compliant .有一个 issue in the Apache Http Client bugtracker其中包含更多信息和问题的可能解决方案。

关于java - HTTP Builder/Groovy - 丢失 302(重定向)处理？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/2975515/