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Thread: DO NOT REPLY New: - If Apache is used as the reverse proxy for the DAV-enabled server




DO NOT REPLY New: - If Apache is used as the reverse proxy for the DAV-enabled server
country flaguser name
United States		 2007-02-25 14:36:55 
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http://issues.apache.org/bugzilla/show_bug.cgi?id=41698

           Summary: If Apache is used as the reverse proxy
for the DAV-
                    enabled server (for example, SVN or GIT
repository), it
                    will not rewrite the 'Destination'
header using the
                    information from the ProxyPass
directives. This will
                    break DAV COPY and MOVE requests (and
probably some
                    other ones). This is rather well-known
problem: see
                    http://silmor.de/49 and
                    h
ttp://svn.haxx.se/users/archive-2005-03/1452.html. The
                    Apache's HEAD can cure the problem by
the rewriting via
                    RequestHeader, but the cleaner way to go
is to enable
                    mod_proxy_http to handle the
'Destination' header. The
                    patch provided by the URL does this.
I've tested it with
                    the HTTPS Apache reverse proxy and the
DAV backend
                    served by Apache's native DAV via HTTP.
           Product: Apache httpd-2
           Version: 2.2.4
          Platform: All
               URL: http://codel
abs.ru/patches/apache/patch-
                    mod_proxy_http.c-destination
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mod_proxy
        AssignedTo: bugshttpd.apache.org
        ReportedBy: rea-asfcodelabs.ru


 

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DO NOT REPLY - If Apache is used as the reverse proxy for the DAV-enabled server (for e
country flaguser name
United States		 2007-02-25 14:39:31 

  


  

    
  

  
  
   
     
    

  

    DO NOT REPLY   - Site documentation of
Header edit is missing
  


  

     country flaguser name
United States		
     2007-02-25 14:57:00
  


  

    
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http://issues.apache.org/bugzilla/show_bug.cgi?id=41698


nickwebthing.com changed:

           What    |Removed                     |Added
------------------------------------------------------------
----------------
          Component|mod_proxy                  
|Documentation
            Summary|If Apache is used as the    |Site
documentation of Header
                   |reverse proxy for the DAV-  |edit is
missing
                   |enabled server (for example,|
                   |SVN or GIT repository)      |
            Summary|it will not rewrite the     |
                   |'Destination' header using  |
                   |the information from the    |
                   |ProxyPass directives. This  |
                   |will break DAV COPY and MOVE|
                   |requests (and probably some |
                   |other ones). This is rather |
                   |well-known problem: see     |
                   |http://silmor.de/49 and    
|
            Summary|http://svn.haxx.se/users
/arc|
                   |hive-2005-03/1452.html. The |
                   |Apache's HEAD can cure the  |
                   |problem by the rewriting via|
                   |RequestHeader               |
            Summary|but the cleaner way to go is|
                   |to enable mod_proxy_http to |
                   |handle the 'Destination'    |
                   |header. The patch provided  |
                   |by the URL does this. I've  |
                   |tested it with the HTTPS    |
                   |Apache reverse proxy and the|
                   |DAV backend served by       |
                   |Apache's native DAV via     |
                   |HTTP.                       |




------- Additional Comments From nickwebthing.com  2007-02-25
12:57 -------
Please see http://httpd.apache.org/docs/2.3/mod/mod_headers.htm
l#header

I don't know why the documentation of this fix hasn't made
it through to 2.2. 
The fix itself is in 2.2.4.

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    DO NOT REPLY   - Site documentation of
Header edit is missing
  


  

     country flaguser name
United States		
     2007-02-27 15:08:21
  


  

    

  


  

    
  

  
  
   
     
    

  

    DO NOT REPLY   - Site documentation of
Header edit is missing
  


  

     country flaguser name
United States		
     2007-02-28 23:51:41
  


  

    
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------- Additional Comments From rea-asfcodelabs.ru  2007-02-28 21:51 -------
Ruediger,
(In reply to comment #8)
> (In reply to comment #5)
> > Could you please give the Apache configuration
exempt for which my patch will
> > break mod_rewrite: I will try to see if it can be
fixed.
> 
> It does not break mod_rewrite, but it does not work
with mod_rewrite, as after
> applying your patch things will behave differently when
you do proxying via
> ProxyPass or mod_rewrite
> 
> To give you a simple example:
> 
> RewriteRule ^/(.*) http://backend.org/$1 [P]
> 
> does the same as
> 
> ProxyPass / http://backend.org/
> 
> But using the RewriteRule instead of ProxyPass will
leave the Destination header
> unchanged with your patch. The basic shortcoming of
your patch is that it does
> not apply all the transformations done to the original
request URL to the
> Destination header URL, so they get out of sync. You
only apply the
> transformations caused by ProxyPass. Most of these
transformations are done
> during the translate_name hook, but some of them are
also done during the fixup
> phase (mod_rewrite in directory context).

OK, if I will enable mod_rewrite to do the same Destination
rewriting and will
apply 'all the transformations done to the original request
URL' -- will it have
a chance to be committed? To tell the truth, just now I have
no idea what are
those 'all transformations' but will try to understand. May
be you will be so
kind to point me to the relevant code locations?

And if we will turn this into the documentation issue, I
will vote that
mod_dav's documentation should note that the 'Destination'
should be rewritten
if we're living with the proxy. It is not obvious for the
administrator when the
proxied DAV is refusing to to PUT and MOVE.


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    DO NOT REPLY   - Site documentation of
Header edit is missing
  


  

     country flaguser name
United States		
     2007-03-01 15:37:55
  


  

    
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------- Additional Comments From rpluemapache.org  2007-03-01 13:37 -------
(In reply to comment #9)

> 
> OK, if I will enable mod_rewrite to do the same
Destination rewriting and will
> apply 'all the transformations done to the original
request URL' -- will it have
> a chance to be committed? To tell the truth, just now I
have no idea what are
> those 'all transformations' but will try to understand.
May be you will be so
> kind to point me to the relevant code locations?

As said most of them are done in the translate_name hook and
some in the fixup
hook, but in the general I think this can happen in other
hooks as well
(possibly due to other 3rd party modules). That said I
currently have no good
starting point how to do this properly. The only option that
might open a
possibility would be subrequests.
Anyway some documentation references:

http://httpd.apache.org/docs/2.2/en/developer/hooks.html

http://httpd.apache.org/docs/2.2/en/developer/request.
html
http://www.apachetuto
r.org/dev/

> 
> And if we will turn this into the documentation issue,
I will vote that
> mod_dav's documentation should note that the
'Destination' should be rewritten
> if we're living with the proxy. It is not obvious for
the administrator when the
> proxied DAV is refusing to to PUT and MOVE.
> 

This is definitely a good idea. Could you provide a
documentation patch?

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    DO NOT REPLY   - Site documentation of
Header edit is missing
  


  

     country flaguser name
United States		
     2007-03-28 10:22:02
  


  

    
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------- Additional Comments From rea-asfcodelabs.ru  2007-03-28 08:22 -------
Ruediger,

(In reply to comment #10)
> As said most of them are done in the translate_name
hook and some in the fixup
> hook, but in the general I think this can happen in
other hooks as well
> (possibly due to other 3rd party modules). That said I
currently have no good
> starting point how to do this properly. The only option
that might open a
> possibility would be subrequests.

I've done some hacking on the mod_rewrite and the
Destination header. The full
patch is attached, please, have a look. I've tested it, and
it works for me as
expected.

> > And if we will turn this into the documentation
issue, I will vote that
> > mod_dav's documentation should note that the
'Destination' should be rewritten
> > if we're living with the proxy. It is not obvious
for the administrator when the
> > proxied DAV is refusing to to PUT and MOVE.
> > 
> 
> This is definitely a good idea. Could you provide a
documentation patch?

I will provide it, but I need to understand if the current
patch will be
accepted, because different documentation patches should be
done in the case it
will be accepted and otherwise.

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    DO NOT REPLY   - Site documentation of
Header edit is missing
  


  

     country flaguser name
United States		
     2007-03-28 10:23:37
  


  

    
DO NOT REPLY TO THIS EMAIL, BUT PLEASE POST YOUR BUG·
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698>.
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rea-asfcodelabs.ru changed:

           What    |Removed                     |Added
------------------------------------------------------------
----------------
  Attachment #19633|0                           |1
        is obsolete|                            |




------- Additional Comments From rea-asfcodelabs.ru  2007-03-28 08:23 -------
Created an attachment (id=19832)
 --> (http://issues.apache.org/bugzilla/attac
hment.cgi?id=19832&action=view)
New version of 'Destination' header rewriting patch


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    DO NOT REPLY   - Site documentation of
Header edit is missing
  


  

     country flaguser name
United States		
     2007-03-29 04:29:20
  


  

    
DO NOT REPLY TO THIS EMAIL, BUT PLEASE POST YOUR BUG·
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698>.
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rea-asfcodelabs.ru changed:

           What    |Removed                     |Added
------------------------------------------------------------
----------------
  Attachment #19832|0                           |1
        is obsolete|                            |




------- Additional Comments From rea-asfcodelabs.ru  2007-03-29 02:29 -------
Created an attachment (id=19837)
 --> (http://issues.apache.org/bugzilla/attac
hment.cgi?id=19837&action=view)
Corrected version for the 'Destination' header patch.

Rewrited the patch a bit. Still not sure that I am using the
right source of
the 'dirpath' argument in the mod_rewrite part. Can someone
enlight me: I just
want to get the URL prefix of the RewriteRule location. I
mean that if
DocumentRoot = /www
<Directory /www/path>
RewriteRule whatever
</Directory>
then I want the 'dirpath' to be '/path/' for the mentioned
RewriteRule.

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Header edit is missing
  


  

     country flaguser name
United States		
     2007-03-29 15:26:20
  


  

    
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------- Additional Comments From rpluemapache.org  2007-03-29 13:26 -------
(In reply to comment #11)
> Ruediger,
> 
> (In reply to comment #10)
> > As said most of them are done in the
translate_name hook and some in the fixup
> > hook, but in the general I think this can happen
in other hooks as well
> > (possibly due to other 3rd party modules). That
said I currently have no good
> > starting point how to do this properly. The only
option that might open a
> > possibility would be subrequests.
> 
> I've done some hacking on the mod_rewrite and the
Destination header. The full
> patch is attached, please, have a look. I've tested it,
and it works for me as
> expected.

Many thanks for your continued work on this. Sorry, I guess
it is my fault that
I did not explain the problem clearly enough. To be honest I
have not looked at
your patch in detail now, but however perfect it may be for
the mod_rewrite case
it will not fix the problem, because mod_rewrite is only
*one* module that could
break. The final solution needs to deal with *any* module
that adjusts the
original uri during request processing, so even third party
modules and modules
that have not been written yet.
But digging somewhat deeper I noticed that since 2.2.x the
Destination header
gets rewritten in the same way as the Location header. So
you can configure this
properly via ProxyPassReverse (which you need to do anyway
to get the redirects
fixed). Of course there is still a documentation bug as the
documentaion of
ProxyPassReverse fails to document this behaviour.

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