Michiel Proce created HTTPCLIENT-1294:
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Summary: 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: 4.2.2, 4.1.3
Reporter: Michiel Proce
Priority: Minor
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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