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Posted to dev@httpd.apache.org by Nick Gearls <ni...@gmail.com> on 2010/06/02 14:05:39 UTC
mod_proxy and chunked encoding
Hello,
Although I can see a lot of problems related to chunked encoding, it is
not clear to me if it is correctly supported in latests versions.
During tests with 2.2.4, I found the following problem: when the
back-end sends chunked encoding to an Apache reverse proxy (see below
for loaded modules), it seems that Apache does not understands it is
chunked encoded (although the header is present), and sends the complete
packet with the chunks length as part of the (non chunked encoded) message.
When suppressing the chunked encoding (by forcing HTTP 1.0 with "setenv
force-proxy-request-1.0"), it works smoothly.
Is this supposed to be one of the known bugs - I don't see corresponding
one (no mod_filter, mod_deflate, etc.)?
Details:
--------- Answer from the back-end ---------
HTTP/1.1 200 OK
Date: Tue, 01 Jun 2010 12:01:23 GMT
Server: ***back-end******
Content-Type: text/html; charset=utf-8
Content-Length: 28903
Transfer-Encoding: chunked
Connection: close
70d9
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
…
</body>
</html>
0
--------- Answer from the reverse proxy ---------
HTTP/1.1 200 OK
Date: Tue, 01 Jun 2010 12:01:23 GMT
Server: ***front-end******
Content-Type: text/html; charset=utf-8
Vary: Accept-Encoding,User-Agent
Content-Length: 28903
Connection: close
70d9
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
…
</body>
</html>
0
---------
Relevant loaded modules:
* mod_rewrite
* mod_substitute
* mod_include
* mod_proxy
* mod_proxy_http
Regards,
Nick
Re: mod_proxy and chunked encoding
Posted by Sergey Chernyshev <se...@gmail.com>.
Not sure if helps, but I had similar experience with nginx - what
happened to me is that proxy did not understand chunked encoding, and
double-encoded the content so browsers treated original chunk markers
as content after decoding proxy's markers.
On Wednesday, June 2, 2010, Nick Gearls wrote:
> Hello,
>
> Although I can see a lot of problems related to chunked encoding, it is not clear to me if it is correctly supported in latests versions.
> During tests with 2.2.4, I found the following problem: when the back-end sends chunked encoding to an Apache reverse proxy (see below for loaded modules), it seems that Apache does not understands it is chunked encoded (although the header is present), and sends the complete packet with the chunks length as part of the (non chunked encoded) message.
>
> When suppressing the chunked encoding (by forcing HTTP 1.0 with "setenv force-proxy-request-1.0"), it works smoothly.
> Is this supposed to be one of the known bugs - I don't see corresponding one (no mod_filter, mod_deflate, etc.)?
>
> Details:
> --------- Answer from the back-end ---------
> HTTP/1.1 200 OK
> Date: Tue, 01 Jun 2010 12:01:23 GMT
> Server: ***back-end******
> Content-Type: text/html; charset=utf-8
> Content-Length: 28903
> Transfer-Encoding: chunked
> Connection: close
>
> 70d9
>
>
>
>
> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
> …
>
>
>
> 0
> --------- Answer from the reverse proxy ---------
> HTTP/1.1 200 OK
> Date: Tue, 01 Jun 2010 12:01:23 GMT
> Server: ***front-end******
> Content-Type: text/html; charset=utf-8
> Vary: Accept-Encoding,User-Agent
> Content-Length: 28903
> Connection: close
>
> 70d9
>
>
>
>
> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
> …
>
>
>
> 0
> ---------
>
> Relevant loaded modules:
>
> * mod_rewrite
> * mod_substitute
> * mod_include
> * mod_proxy
> * mod_proxy_http
>
> Regards,
>
> Nick
>
>
--
Thank you,
Sergey
--
Sergey Chernyshev
http://www.sergeychernyshev.com/
RE: mod_proxy and chunked encoding
Posted by "Plüm, Rüdiger, VF-Group" <ru...@vodafone.com>.
> -----Original Message-----
> From: Nick Gearls
> Sent: Mittwoch, 2. Juni 2010 14:06
> To: Development Apache
> Subject: mod_proxy and chunked encoding
>
> Hello,
>
> Although I can see a lot of problems related to chunked
> encoding, it is
> not clear to me if it is correctly supported in latests versions.
> During tests with 2.2.4, I found the following problem: when the
2.2.4 is fairly old. Have you tried with a more recent version?
Regards
Rüdiger