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"Server redirected too many times (20)" problem

Posted on 2006-07-10
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Last Modified: 2011-04-14
I'm trying to open a URL using HttpsURLConnection, but once in a while I got this message: "Server redirected too many times (20)". What can I do about this? Is this usually something wrong with the java code or the website setup?

Thanks in advance for the help
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Question by:rnicholus
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Ajay-Singh earned 150 total points
ID: 17075332
Usually happens when you are missing some of cookies server needs.
Try using jakarta-httpclient, it has cookie handling
http://jakarta.apache.org/commons/httpclient/
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Author Comment

by:rnicholus
ID: 17075399
Hi Ajay-Singh,

Thanks for your reply.
I don't understand how this is related to the cookies server needs. Could you please explain more?
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Expert Comment

by:Ajay-Singh
ID: 17075525
yes. there could be 2 cases:
1. server needs a cookie that client is not sending and server redirects (after adding some cookies) to some page. When client ignores the second page - it leads to infinite redirection.
2. The server is not configured correctly. Like when we try to download page x.html, it redirects to y.html. When y.html is asked it redirects to x.html
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Author Comment

by:rnicholus
ID: 17075580
Ajay-Singh,

1. What do you mean by "client ignores the second page."?
2. If it happens very random and only once in a while, isn't it unlikely that the server actually needs the cookie?

Thanks for the on-going help.
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Expert Comment

by:Ajay-Singh
ID: 17075615
> What do you mean by "client ignores the second page."?
sorry about typo - i mean when client ignore the cookie sent my the server in the redirection response.
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by:Ajay-Singh
ID: 17075627
> If it happens very random and only once in a while, isn't it unlikely
> that the server actually needs the cookie?
and are you able to download this page consistently from standard browsers (like IE)
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Author Comment

by:rnicholus
ID: 17075712
One of my coworker have tried to access the page manually when the "Server redirected too many times (20)" message occurs in the program console output.
He said that he tried to login several times using username and pwd that has been provided to us but the page rejected the login.
And then it prints the exception below.

I'm not sure whether this is caused by my friends trying to login too many times or could be something else.

-----------------------------------------------------------------------------------------

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException
      org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:358)
      org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
      org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
      ..........

root cause

java.lang.NullPointerException
      org.apache.jsp.error_jsp._jspService(error_jsp.java:415)
      org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
      org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
      org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
      org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
      ..........
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Expert Comment

by:Ajay-Singh
ID: 17075867
by any change you jsp redirects based on some condition? can you post that part of the jsp code?
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Author Comment

by:rnicholus
ID: 17075928
That JSP exception is not coming from my program. What I have is a console-based program that access this page.

The JSP exception is what my friend see in the browser (I think he used Internet Explorer) when trying to access that page.
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Assisted Solution

by:astorer
astorer earned 150 total points
ID: 17077641
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Assisted Solution

by:ksivananth
ksivananth earned 150 total points
ID: 17078090
I think, you are looking for this,

try {
  URL url = new URL("yourURL");
  HttpURLConnection con = (HttpURLConnection) url.openConnection();
  con.setFollowRedirects(true);
  con.setInstanceFollowRedirects(false);
  con.connect();
 
  while (String.valueOf(con.getResponseCode()).startsWith("3")) {
     String theLocation = con.getHeaderField("Location");
     con.disconnect();
     url = new URL(theLocation);
     con = (HttpURLConnection) url.openConnection();
     con.setFollowRedirects(true);
     con.setInstanceFollowRedirects(false);
     con.connect();
     }
     /** at this point you are located at the last(target)page of
         redirection chain */
 
} catch (Exception ex) { ex.printStackTrace(); }

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LVL 26

Expert Comment

by:ksivananth
ID: 17078101
and this may also help you to increase the max redirects!

http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4458085
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Author Comment

by:rnicholus
ID: 17082360
ksivananth,
could you please explain to me what your code will do?

astorer,
i have seen the link before. i'm currently running the code the link provides -> just to know what URL I am being redirected to.
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LVL 26

Expert Comment

by:ksivananth
ID: 17083497
It checks if the request is redirected, if so, makes a connection to the redirected URL! If your URL redirects more than 20 times, you may consider using the maxRedirects property.
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LVL 26

Expert Comment

by:ksivananth
ID: 17083500
but did u try that?
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Author Comment

by:rnicholus
ID: 17100848
I will try this code. I'll let you know
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Author Comment

by:rnicholus
ID: 17131681
ksivananth,

i tried your code and when the exception occurs, it doesn't go inside the while loop.
any advice?

thanks
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LVL 26

Expert Comment

by:ksivananth
ID: 17132252
>>i tried your code and when the exception occurs, it doesn't go inside the while loop.

what exception?

is it the "Server redirected too many times (20)"? if so, try set the "http.maxRedirects" property to large value!
0
 

Expert Comment

by:khimanijay
ID: 24261286
Check this out. Its the similar problem I face and here is the solution to it...
http://jaykhimani.blogspot.com/2009/04/problem-with-jdk-and-network-proxy.html
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