Java 手动向网站发送GET请求。302重定向错误_Java_Http_Redirect_Get_Request

Java 手动向网站发送GET请求。302重定向错误

java http redirect

Java 手动向网站发送GET请求。302重定向错误,java,http,redirect,get,request,Java,Http,Redirect,Get,Request,我目前正在使用java开发一个web scraper。我通过设置tcp连接并使用printerwriter手动发送GET请求我可以连接到大多数网站，如yahoo.com或crack.com，并收到回复，但我无法连接到我的目标网站-vinylengine.com。它将始终返回302错误我将我的发送请求与浏览器的发送请求进行了比较，它们几乎完全相同我的标题： GET / HTTP/1.1 Host: www.vinylengine.com HTTP/1.1 302 Found Date: T

我目前正在使用java开发一个web scraper。我通过设置tcp连接并使用printerwriter手动发送GET请求

我可以连接到大多数网站，如yahoo.com或crack.com，并收到回复，但我无法连接到我的目标网站-vinylengine.com。它将始终返回302错误

我将我的发送请求与浏览器的发送请求进行了比较，它们几乎完全相同

我的标题：

GET / HTTP/1.1
Host: www.vinylengine.com

HTTP/1.1 302 Found
Date: Thu, 06 Jun 2013 19:27:00 GMT
Server: Apache
Location: http://www.nakedresource.com/
Cache-Control: max-age=1209600
Expires: Thu, 20 Jun 2013 19:27:00 GMT
Content-Length: 213
Content-Type: text/html; charset=iso-8859-1

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>302 Found</title>
</head><body>
<h1>Found</h1>
<p>The document has moved <a href="http://www.nakedresource.com/">here</a>.</p>
</body></html>

GET http://www.vinylengine.com/ HTTP/1.1
Host: www.vinylengine.com
User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Cookie: __utma=72407316.18415374.1370488314.1370497873.1370543389.3; __utmz=72407316.1370488314.1.1.utmccn=(direct)|utmcsr=(direct)|utmcmd=(none); SESSaf8d12283bdbdc5f5bbfb2aef054db6d=1f0676e5cab0ba2c5a80e76ea0bd6f75; __utmc=72407316; has_js=1; __utmb=72407316
Connection: keep-alive
If-Modified-Since: Thu, 06 Jun 2013 18:02:53 GMT
If-None-Match: "2186d59ac297e0f1a43433fa61e8a94b"

public void sendRequest(String extensionString, String urlString)
{  
    try 
    {
        //BufferedReader inFromServer;
        //PrintWriter outToServer;
        //These 2 are initalized elsewhere

        outToServer.println("GET " + extensionString + " HTTP/1.1");
        outToServer.println("Host: " + urlString);

        outToServer.println("");
        outToServer.flush();

        String temp;
        while((temp=inFromServer.readLine()) != null) 
        {
            System.out.println(temp);
        }

        return;
    } 
    catch (Exception e) 
    {
        System.out.printf("sendRequest failed: %s",e);
        return;
    }
}

我的回答：

GET / HTTP/1.1
Host: www.vinylengine.com

HTTP/1.1 302 Found
Date: Thu, 06 Jun 2013 19:27:00 GMT
Server: Apache
Location: http://www.nakedresource.com/
Cache-Control: max-age=1209600
Expires: Thu, 20 Jun 2013 19:27:00 GMT
Content-Length: 213
Content-Type: text/html; charset=iso-8859-1

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>302 Found</title>
</head><body>
<h1>Found</h1>
<p>The document has moved <a href="http://www.nakedresource.com/">here</a>.</p>
</body></html>

GET http://www.vinylengine.com/ HTTP/1.1
Host: www.vinylengine.com
User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Cookie: __utma=72407316.18415374.1370488314.1370497873.1370543389.3; __utmz=72407316.1370488314.1.1.utmccn=(direct)|utmcsr=(direct)|utmcmd=(none); SESSaf8d12283bdbdc5f5bbfb2aef054db6d=1f0676e5cab0ba2c5a80e76ea0bd6f75; __utmc=72407316; has_js=1; __utmb=72407316
Connection: keep-alive
If-Modified-Since: Thu, 06 Jun 2013 18:02:53 GMT
If-None-Match: "2186d59ac297e0f1a43433fa61e8a94b"

public void sendRequest(String extensionString, String urlString)
{  
    try 
    {
        //BufferedReader inFromServer;
        //PrintWriter outToServer;
        //These 2 are initalized elsewhere

        outToServer.println("GET " + extensionString + " HTTP/1.1");
        outToServer.println("Host: " + urlString);

        outToServer.println("");
        outToServer.flush();

        String temp;
        while((temp=inFromServer.readLine()) != null) 
        {
            System.out.println(temp);
        }

        return;
    } 
    catch (Exception e) 
    {
        System.out.printf("sendRequest failed: %s",e);
        return;
    }
}

代码：

GET / HTTP/1.1
Host: www.vinylengine.com

HTTP/1.1 302 Found
Date: Thu, 06 Jun 2013 19:27:00 GMT
Server: Apache
Location: http://www.nakedresource.com/
Cache-Control: max-age=1209600
Expires: Thu, 20 Jun 2013 19:27:00 GMT
Content-Length: 213
Content-Type: text/html; charset=iso-8859-1

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>302 Found</title>
</head><body>
<h1>Found</h1>
<p>The document has moved <a href="http://www.nakedresource.com/">here</a>.</p>
</body></html>

GET http://www.vinylengine.com/ HTTP/1.1
Host: www.vinylengine.com
User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Cookie: __utma=72407316.18415374.1370488314.1370497873.1370543389.3; __utmz=72407316.1370488314.1.1.utmccn=(direct)|utmcsr=(direct)|utmcmd=(none); SESSaf8d12283bdbdc5f5bbfb2aef054db6d=1f0676e5cab0ba2c5a80e76ea0bd6f75; __utmc=72407316; has_js=1; __utmb=72407316
Connection: keep-alive
If-Modified-Since: Thu, 06 Jun 2013 18:02:53 GMT
If-None-Match: "2186d59ac297e0f1a43433fa61e8a94b"

public void sendRequest(String extensionString, String urlString)
{  
    try 
    {
        //BufferedReader inFromServer;
        //PrintWriter outToServer;
        //These 2 are initalized elsewhere

        outToServer.println("GET " + extensionString + " HTTP/1.1");
        outToServer.println("Host: " + urlString);

        outToServer.println("");
        outToServer.flush();

        String temp;
        while((temp=inFromServer.readLine()) != null) 
        {
            System.out.println(temp);
        }

        return;
    } 
    catch (Exception e) 
    {
        System.out.printf("sendRequest failed: %s",e);
        return;
    }
}

我已尝试将主机名更改为nakedresource.com，但当我这样做时，我得到的是nakedresource.com的页面源代码，而不是vinylengine.com

当您在浏览器中配置了代理，但JVM不知道时，这是可能的

尝试使用以下参数启动JVM，看看它是否解决了问题：

-Dhttp.proxyHost=10.12.11.1 -Dhttp.proxyPort=8800

如果您正在使用上述代码

另请参阅

相关网站正在查看您的用户代理字符串（或者在您的案例中缺少该字符串）

当你说你正在做与浏览器“几乎相同的事情”时。。。你说得对。电脑对这类事情有点挑剔

如果不提供

用户代理：

标题，则会得到重定向

>telnet www.vinylengine.com 80
正在尝试67.225.154.112…
已连接到vinylengine.com。
转义字符为“^]”。
获取/HTTP/1.1
主持人：www.vinylengine.com
接受：*/*

找到HTTP/1.1 302

然而，如果您提供了一个，您将获得以下页面：

>telnet www.vinylengine.com 80
正在尝试67.225.154.112…
已连接到vinylengine.com。
转义字符为“^]”。
获取/HTTP/1.1
主持人：www.vinylengine.com
用户代理：curl/7.21.4（universal-apple-darwin11.0）libcurl/7.21.4 OpenSSL/0.9.8r zlib/1.2.5
接受：*/*

HTTP/1.1200正常
... （页面）

这通常是因为站点根据

用户代理

标题向不同的浏览器提供不同版本的内容。显然，他们对“无用户代理”的回答是。。。下注，您将被重定向到父站点根。

HTTP 302意味着重定向，因此您需要再次调用重定向的URL。因此，您没有做与浏览器相同的事情，然后想知道为什么结果不同？问题不是这样，问题是站点查找用户代理字符串。仅供参考，重定向是因为没有

用户代理字符串。然后，它会将您带到另一个（父）站点，而不是所讨论的实际页面。您可以随时参考以了解如何添加用户代理字符串。+1正是我的发现（甚至是相同的zLib版本：）。感谢您解决了此问题！