upstream sent invalid chunked response

Wim R. Crols wim.crols at
Mon Feb 24 10:52:48 UTC 2014


We are using nginx as a reverse proxy before JBoss and Apache. Certain POST
requests are failing when passing through nginx. /var/log/nginx/error.log
showed errors like this:

2014/02/24 10:05:05 [error] 3409#0: *1744 upstream sent invalid chunked
response while reading response header from upstream, client:,
server: appliance, request: "POST /archive/python/pulsar/browser/
HTTP/1.1", upstream: "",
host: ""

Doing a little research I understood version 1.2.1 which we used had a
problem with chunked encoding so I upgraded to 1.4.5 (since this is the
official Debian wheezy-backports version). However, the same error appears.
Do I have to turn something on to make this feature work? I did not find
anything in the documentation (only a config option
'chunked_transfer_encoding' to turn if off, if I understood correctly).

If it is any help, my test with wget (performed from "in front" of nginx of
course) below produces the above "invalid chunked response" log error each
time. I confirmed that the request performed from "behind" nginx works.

wcrols at wim:/home/wcrols/downloads/pacstmp$ wget -SO - --post-file POST.xml
--2014-02-24 11:48:00--
Connecting to connected.
The certificate's owner does not match hostname `'
HTTP request sent, awaiting response...
  HTTP/1.1 200 OK
  Server: nginx/1.4.5
  Date: Mon, 24 Feb 2014 10:47:59 GMT
  Content-Type: text/xml
  Transfer-Encoding: chunked
  Connection: keep-alive
  Pragma: no-cache
  Cache-control: no-cache, no-store, must-revalidate, max-age=1,
max-stale=0, post-check=0, pre-check=0, private
  Expires: Mon, 26 Jul 1997 05:00:00 GMT
  Vary: *,Accept-Encoding
  via: HTTP/1.1 apps
Length: unspecified [text/xml]
Saving to: `STDOUT'

    [ <=>

                   ] 0           --.-K/s   in 0s

2014-02-24 11:48:01 (0.00 B/s) - written to stdout [0]

Thank you for your help,

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