Hello fellow UWSGI supporters,
I'm struggling with an issue in my PHP software (namely Pimcore).
The PHP stuff is served through an Haproxy -> Nginx -> UWSGI stack that
runs without a hitch since 18 months.
A few days ago, after a Pimcore software update to version 2.3.0, users
reported corrupted file downloads, and I noticed something weird with
Content-Length. Let me illustrate the problem with an example from the
logs.
>From uwsgi logs:
[pid: 15215|app: -1|req: -1/15] 127.0.0.1 () {32 vars in 567 bytes} [Mon
Dec 8 14:58:50 2014] GET
/admin/asset/get-image-thumbnail/id/8280/treepreview/true_dc=1418043520956/download/true
=> generated *13950* bytes in 4364 msecs (HTTP/1.1 200) 8 headers in 256
bytes (0 switches on core 0)
>From nginx logs:
127.0.0.1 - - [08/Dec/2014:14:58:54 +0100] "GET
/admin/asset/get-image-thumbnail/id/8280/treepreview/true_dc=1418043520956/download/true
HTTP/1.1" 200 *12032* "-" "curl/7.22.0 (x86_64-pc-linux-gnu) libcurl/7.22.0
OpenSSL/1.0.1 zlib/1.2.3.4 libidn/1.23 librtmp/2.3"
As you can see there is a discrepancy between the response length reported
by uwsgi, and the one from nginx. It should be the same.
The output of curl is also surprising:
$ curl -i -b pimcore_admin_sid=something
http://localhost/admin/asset/get-image-thumbnail/id/8280/treepreview/true_dc=1418043520956/download/true
HTTP/1.1 200 OK
Server: nginx/1.1.19
Date: Mon, 08 Dec 2014 13:58:54 GMT
Content-Type: image/pjpeg
*Content-Length: 2*Connection: keep-alive
Content-Disposition: attachment; filename="320.336g-1.pjpeg"
Cache-Control: public, max-age=300
Expires: Mon, 08 Dec 2014 15:03:54 +0100
Pragma:
X-Powered-By: pimcore
As you can see the reported Content-Length this time is 2 bytes! And
please notice there are two blank lines in the response.
How is it possible that the Content-Length is different in three places?
I couldn't find a way to make this problem 100% reproducible, so this is
particularly difficult to resolve.
Your help would be appreciated to narrow down what is causing this.
UWSGI config file: https://gist.github.com/jbq/6840da7bb0e5de1fff85
Nginx config file: https://gist.github.com/jbq/76ebfd526f2ba8b60166
Best regards,
--
Jean-Baptiste Quenot
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