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