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From "Gary D. Gregory (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (VFS-428) DavException: (301) Moved Permanently
Date Tue, 31 Jul 2012 13:33:34 GMT

    [ https://issues.apache.org/jira/browse/VFS-428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13425753#comment-13425753
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Gary D. Gregory commented on VFS-428:
-------------------------------------

I can see the root cause from your last post. I did not try the set up.

It looks like the HttpClient 3.1 implementation is correct. I read this Javadoc in {{org.apache.commons.httpclient.methods.EntityEnclosingMethod.setFollowRedirects(boolean)}}:

{quote}
Entity enclosing requests cannot be redirected without user intervention according to RFC
2616.
{quote}

In RFC 2616, section 10.3.2, I read:

{quote}
If the 301 status code is received in response to a request other than GET or HEAD, the user
agent MUST NOT automatically redirect the request unless it can be confirmed by the user,
since this might change the conditions under which the request was issued. 
{quote}

See http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3

When I look at JackRabbit 1.6.5 (the WebDAV library VFS uses), I see a that JR uses a class
called org.apache.jackrabbit.webdav.client.methods.PropFindMethod. This is a custom JR WebDAV
class.

This explains the failure because it is neither an HTTP GET or HEAD.

I'm not sure what to do here. There are many newer versions of JR available but I've not upgraded
VFS because JR no longer delivers an all-in-one jar.

You could try to use the current version of JR and see what happens. This may require changes
to code and will certainly need some changes to the VFS POM.
                
> DavException: (301) Moved Permanently 
> --------------------------------------
>
>                 Key: VFS-428
>                 URL: https://issues.apache.org/jira/browse/VFS-428
>             Project: Commons VFS
>          Issue Type: Bug
>    Affects Versions: 2.0, 2.1
>         Environment: Apache 2.2.22 as Testerver and setted up like http://commons.apache.org/vfs/testserver.html
(but changed the 'crypt' password)
>            Reporter: Robert Kornmesser
>            Priority: Blocker
>              Labels: webdav
>
> Running the WebdavProviderTestCase using mvn -P webdav clean test -Dtest.webdav.uri=webdav://vfsusr:vfstest@localhost/vfstest
-Dtest=WebdavProviderTestCase results in 
> {code}DavException: (301) Moved Permanently
> Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.645 sec <<<
FAILURE!
> Results :
> Tests in error: 
>   junit.framework.TestSuite@55c9be00(org.apache.commons.vfs2.provider.webdav.test.WebdavProviderTestCase$1):
Could not determine the type of file "webdav://vfsusr:****@localhost/vfstest/read-tests".
> Tests run: 1, Failures: 0, Errors: 1, Skipped: 0
> {code}
> The deeper Problem is, that the HttpClient using by VFS does not append a trailing slash
and mod_dir of httpd has "DirectorySlash On" per default. So httpd send 301 redirect to the
same url with / appended.
> I know that for this reason of problematic webdav client apache introduced "redirect-carefully"
for some user agents using the "BrowserMatch" directive. So I just tried adding the following
into my <Directory> directive
> {code}
> BrowserMatch "^Jakarta-Commons-VFS" redirect-carefully
> BrowserMatch "^Jakarta Commons-HttpClient/3.0" redirect-carefully
> BrowserMatch "^Jakarta Commons-HttpClient/3.1" redirect-carefully
> {code}
> Its needed to have Jakarta-Commons-VFS *and* Jakarta Commons-HttpClient because of two
requests from commons vfs using two different user agents.
> But instead of solving the issue, I get for every FileObject.getChildren() call at least
one FileObject of type imaginary with the same basename as the parent. Thats not a problem
at all (besides that this is totally wrong!) but deleting a parent just dont work anymore,
because of an *non-existent* imaginary file inside the dir which cannot be deleted of course.
> To cut a long story short, what is the right httpd webdav server config to use 2.0 Release
version of VFS?

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