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From "Ian Blavins (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HTTPCLIENT-1294) CircularRedirectException is falsely thrown on URI case mismatch
Date Tue, 16 Apr 2013 22:37:16 GMT

    [ https://issues.apache.org/jira/browse/HTTPCLIENT-1294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13633500#comment-13633500
] 

Ian Blavins commented on HTTPCLIENT-1294:
-----------------------------------------

G'day

The site went down on Sunday afternoon Australian time. Since it came up again its behaviour
has changed, presumably as part of their site reimplementation. The redirect from <url>
to <url>/ ie the one that just adds a trailing slash has been removed - the preceding
redirect is now straight to <url>/. So the pre-conditions to reproduce the circular
redirects problem no longer exist and I can't reproduce it. That being said there is still
something strange going on here. The site works fine through Safari but if I redirect Safari
through a proxy that uses HttpComponents then I get a couple of redirects into the sequence
before I am redirected to a flavicon instead of the next link in the redirect chain. And if
I replay what I have captured (and Sebb will recognise that sequence) again through HC but
using a quite different bit of code, I still get redirected to the flavicon. I've download
the Charles proxy and will experiment with the site this morning. At the moment I don't have
an HC issue - I have an issue but I can't say with any certainty now that its an HC issue.
                
> CircularRedirectException is falsely thrown on URI case mismatch
> ----------------------------------------------------------------
>
>                 Key: HTTPCLIENT-1294
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1294
>             Project: HttpComponents HttpClient
>          Issue Type: Bug
>          Components: HttpClient
>    Affects Versions: 4.1.3, 4.2.2
>            Reporter: Michiel Proce
>             Fix For: 4.3 Beta2
>
>
> Some servers (including IIS6) redirect wrong-cased request URIs to lower case:
> http://EXAMPLE.com/ -> http://example.com/
> Now when I'm redirected from another URI to an uppercase URI, the following redirects
happen:
> http://referrer.com/ -> http://EXAMPLE.com/ -> http://example.com/
> When running this request with HttpClient (with default ALLOW_CIRCULAR_REDIRECTS: false),
I get a org.apache.http.client.CircularRedirectException, even though a circular redirect
won't occur.
> The problem lies in java.net.URI, the following URIs are considered equal:
> URI a = new URI("http://example.com");
> URI b = new URI("http://EXAMPLE.com");
> // a.equals(b): true
> // a.hashCode() == b.hashCode(): true
> The redirect locations are stored in a HashSet<URI> in org.apache.http.impl.client.RedirectLocations.
A CircularRedirectException is thrown when an URI is already in this hashset.
> I have no real suggestions on how to fix this, because I am not known with the coding
style for HttpClient..

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