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Posted to bugs@httpd.apache.org by bu...@apache.org on 2006/02/06 02:12:06 UTC
DO NOT REPLY [Bug 38524] New: - mod_proxy(_http) does not send keep-alive headers
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Summary: mod_proxy(_http) does not send keep-alive headers
Product: Apache httpd-2
Version: 2.2.0
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: mod_proxy
AssignedTo: bugs@httpd.apache.org
ReportedBy: mk-asf@gigacodes.de
The headers of a proxied page do not contain a keep-alive or connection headers,
but the server acts according to its local keepalive timeout and max count, but
the client-browser needs to guess, wether the server supports keep-alive.
Setup:
./configure --enable-proxy --enable-proxy-http
Config:
ProxyPass /proxy/ http://httpd.apache.org/
Testcase:
#telnet localhost 80
GET /proxy/robots.txt HTTP/1.1
Host: httpd.apache.org
Connection: keep-alive
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1;)
The response neither contains a Connection: nor a Keep-alive: header. However
the connection remains open for 5 seconds and is then "closed by the foreign
host". A "GET / HTTP/1.1" returns:
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
talking directly to the remote server also returns these values, they only get
lost passing the proxy. (this also happens when configured as forward proxy)
BTW: a "connection: close" request header makes its way through to the backend
server, which causes the connection between front and backend server to be
dropped. When used to accelerate a backend server this prevents the connection
from being reused for another client or the next request.
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DO NOT REPLY [Bug 38524] - mod_proxy(_http) does not send keep-alive headers
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------- Additional Comments From rpluem@apache.org 2006-02-07 21:30 -------
Created an attachment (id=17619)
--> (http://issues.apache.org/bugzilla/attachment.cgi?id=17619&action=view)
Patch against trunk
I had a look in this issue and have an idea why this happens. I still need some
discussion for this patch on the dev list, but I would like to know if it fixes
your problem. So could you please try the attached patch and check if it solves
the problem?
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------- Additional Comments From mk-asf@gigacodes.de 2006-02-09 00:18 -------
I really should RTFM of patch and diff, so line numbers and order of fileargs
wouldn't be a problem ...
2 things I'm wondering as code novice about: does the copied table get freed and
wouldn't it be better to just save the removed headers ? (P.S: patch isnt't in
productive environment yet, so we don't know of possible side-effects)
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------- Additional Comments From mk-asf@gigacodes.de 2006-02-08 01:33 -------
thanks for the quick patch, it works for me. However you also need to get rid of
line 616 which already clears the connection header from the headers_in.
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------- Additional Comments From james@arpstorm.net 2006-05-23 09:46 -------
>From mod_proxy_http.c Apache 2.2.2
/*
* TODO: Currently we cannot handle persistent SSL backend connections,
* because we recreate backend->connection for each request and thus
* try to initialize an already existing SSL connection. This does
* not work.
*/
if (is_ssl)
backend->close_on_recycle = 1;
(In reply to comment #12)
> We were experiencing the same problem for our reverse proxy (v2.0) and therefore
> updated to version 2.2.2 that included this patch.
> For testing and debugging purposes we used HTTP connections to our backend (a
> webdispatcher).
> Client <--https--> Apache2.2.2 as Reverse Proxy <--http--> Dispatcher <--http-->
> App Server
>
> For production we need a HTTPS connection to this webdispatcher.
> Client <--https--> Apache2.2.2 as Reverse Proxy <--httpS--> Dispatcher
> <--http--> App Server
>
> When using this setup (mod_proxy + mod_ssl), we're experiencing a lot more
> connections in contrast to the setup without mod_ssl.
> Since I cannot sniff on these HTTPS connections, I cannot provide you with any
logs.
>
> Has anyone experienced the same problem? Any suggestions?
(In reply to comment #12)
> We were experiencing the same problem for our reverse proxy (v2.0) and therefore
> updated to version 2.2.2 that included this patch.
> For testing and debugging purposes we used HTTP connections to our backend (a
> webdispatcher).
> Client <--https--> Apache2.2.2 as Reverse Proxy <--http--> Dispatcher <--http-->
> App Server
>
> For production we need a HTTPS connection to this webdispatcher.
> Client <--https--> Apache2.2.2 as Reverse Proxy <--httpS--> Dispatcher
> <--http--> App Server
>
> When using this setup (mod_proxy + mod_ssl), we're experiencing a lot more
> connections in contrast to the setup without mod_ssl.
> Since I cannot sniff on these HTTPS connections, I cannot provide you with any
logs.
>
> Has anyone experienced the same problem? Any suggestions?
(In reply to comment #12)
> We were experiencing the same problem for our reverse proxy (v2.0) and therefore
> updated to version 2.2.2 that included this patch.
> For testing and debugging purposes we used HTTP connections to our backend (a
> webdispatcher).
> Client <--https--> Apache2.2.2 as Reverse Proxy <--http--> Dispatcher <--http-->
> App Server
>
> For production we need a HTTPS connection to this webdispatcher.
> Client <--https--> Apache2.2.2 as Reverse Proxy <--httpS--> Dispatcher
> <--http--> App Server
>
> When using this setup (mod_proxy + mod_ssl), we're experiencing a lot more
> connections in contrast to the setup without mod_ssl.
> Since I cannot sniff on these HTTPS connections, I cannot provide you with any
logs.
>
> Has anyone experienced the same problem? Any suggestions?
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------- Additional Comments From philip.brusten@cc.kuleuven.be 2006-05-23 09:40 -------
We were experiencing the same problem for our reverse proxy (v2.0) and therefore
updated to version 2.2.2 that included this patch.
For testing and debugging purposes we used HTTP connections to our backend (a
webdispatcher).
Client <--https--> Apache2.2.2 as Reverse Proxy <--http--> Dispatcher <--http-->
App Server
For production we need a HTTPS connection to this webdispatcher.
Client <--https--> Apache2.2.2 as Reverse Proxy <--httpS--> Dispatcher
<--http--> App Server
When using this setup (mod_proxy + mod_ssl), we're experiencing a lot more
connections in contrast to the setup without mod_ssl.
Since I cannot sniff on these HTTPS connections, I cannot provide you with any logs.
Has anyone experienced the same problem? Any suggestions?
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------- Additional Comments From mk-asf@gigacodes.de 2006-02-24 00:21 -------
we are running the patches productive, keepalive headers are correctly exchanged
between browser and frontend apache (mod_proxy). Backend Connections remain open
as far as the backends keep alive settings permits it. No memory problems
noticed. Good work. Thanks.
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rpluem@apache.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Keywords| |PatchAvailable
Resolution| |FIXED
------- Additional Comments From rpluem@apache.org 2006-02-11 22:20 -------
I committed two patches to the trunk (r377053 and r377057,
http://svn.apache.org/viewcvs.cgi?rev=377053&view=rev,
http://svn.apache.org/viewcvs.cgi?rev=377057&view=rev). r377053 fixes the
problem with the missing keepalive headers in the response, wheras r377055
prevents the closing of the backend connection if the client send Connection: close.
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------- Additional Comments From rpluem@apache.org 2006-02-08 21:12 -------
Next stupid thing of mine: Of course its 616 in the patched version, but 620 in
the unpatched one :-).
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------- Additional Comments From rpluem@apache.org 2006-02-14 00:06 -------
http://svn.apache.org/viewcvs.cgi?rev=377053&view=rev introduced a pool memory
problem since I used the wrong pool for apr_table_copy.
http://svn.apache.org/viewcvs.cgi?rev=377525&view=rev should fix this, but I am
waiting for confirmation by other developers. I keep you updated.
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------- Additional Comments From rpluem@apache.org 2006-02-09 14:26 -------
(In reply to comment #5)
> I really should RTFM of patch and diff, so line numbers and order of fileargs
> wouldn't be a problem ...
I should have looked at the patched version :-).
>
> 2 things I'm wondering as code novice about: does the copied table get freed and
Yes, because the space is allocated from a memory pool and this pool is cleaned
after the end of the request.
> wouldn't it be better to just save the removed headers ? (P.S: patch isnt't in
> productive environment yet, so we don't know of possible side-effects)
In principle yes, especially if the other headers are large. I have to take a
look into it whether the extra effort of doing so is justified, because several
headers are removed by ap_proxy_clear_connection and it adds some work to save
them and merge them back in. The full copy approach has a simpler logic and if
possible I like to keep things simple :-)
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------- Additional Comments From rpluem@apache.org 2006-02-19 01:04 -------
It has been confirmed that http://svn.apache.org/viewcvs.cgi?rev=377525&view=rev
fixes the pool memory problem. So could you please test with both patches
applied and let me know the results? Many thanks.
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------- Additional Comments From rpluem@apache.org 2006-02-09 23:42 -------
(In reply to comment #6)
>
> > wouldn't it be better to just save the removed headers ? (P.S: patch isnt't in
> > productive environment yet, so we don't know of possible side-effects)
Meanwhile I had a closer look into this and as apr_table_copy only copies the
pointers to the key / value pairs of the headers I guess we neither gain much
speed (actually I think we will loose speed for a small number of headers) nor
save a reasonable amount of memory (also guess that we waste memory for a low
number of headers) by only saving the removed headers and merg�ng them back in
later on.
I keep you updated.
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------- Additional Comments From rpluem@apache.org 2006-02-08 21:11 -------
(In reply to comment #2)
> thanks for the quick patch, it works for me. However you also need to get rid of
> line 616 which already clears the connection header from the headers_in.
Thanks for the quick test. I think you mean line 620, don't you?
Alas! Stupid copy and paste error. Thanks for pointing it out.
I will discuss the patch on the dev list and keep you in the loop.
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