Below is a copy of an email exchange about an "Internal apreq error" in case someone else sees this error. Note that in the end, it was a problem with the internet provider.
Arnie
Hi Arie,
Great. Thanks for letting us know. I'm going to post this message (which contains the error messages, etc) on the forum so that if others have the same problem, they will see the solution.
Arnie
On Sun, Feb 26, 2012 at 11:33 AM, arie poran <aporan@ono.ac.il> wrote:
Hello,
I talked with the Internet provider, it looks like it was their problem. They blocked some contents from the WeBWorK site.
Now it seems they fixed it, and everything works smooth.
Thank you very-very much for your great help !
Sincerely yours,
Arie
From: aubreyja@gmail.com [mailto:aubreyja@gmail.com] On Behalf Of Jason Aubrey
Sent: Sunday, February 26, 2012 8:12 PM
To: Arnold Pizer
Cc: arie poran; Mike Gage; John Wyatt; Rajiv Sood
Subject: Re: WebWork error message
Hi Arie,
Hmm..I'm stumped...My next suspicion is that maybe we're not handling language headers correctly. I assume that you have your preferred language for displaying pages set to Hebrew. Can you check what happens when you change it to English? Unfortunately for this hypothesis, I changed my preferred language to Hebrew and could not reproduce the error.
Thanks,
Jason
Jason Aubrey, PhD Office: 219 Math Sciences
Department of Mathematics Office Phone: (573)882-4473
University of Missouri - Columbia Voice Mail: (573) 416-0784
Mailing Address:
202 Mathematical Sciences Department Fax: (573)882-1869
University of Missouri Department Phone: (573) 882-6221
Columbia, MO 65211 USA
SP12 Office Hours: MW 12:30-2, F 10:30-12
On Sun, Feb 26, 2012 at 11:51 AM, Arnold Pizer <apizer@math.rochester.edu> wrote:
Hi Arie,
Thanks. When you do please let us know how if you still get this error or not.
Arnie
On Sun, Feb 26, 2012 at 10:47 AM, arie poran <aporan@ono.ac.il> wrote:
Dear Professor Gage,
Thank you very much.
I should try it with another provider.
Sincerely yours,
Arie
From: arnoldpizer@gmail.com [mailto:arnoldpizer@gmail.com] On Behalf Of Arnold Pizer
Sent: Sunday, February 26, 2012 7:40 PM
To: arie poran
Cc: Jason Aubrey; Mike Gage; John Wyatt; Rajiv Sood; Arnold Pizer
Subject: Re: WebWork error message
Thanks Arie.
I don't have an idea what is happening. I searched through the error.log for "ap_get_brigade" and the only places this shows up is with your connection. Very strange. When you have a chance, try connecting from a different provider (e.g. from home or the university, which ever is different) but I'm really just trying to think of different things to try.
Arnie
On Sun, Feb 26, 2012 at 10:30 AM, arie poran <aporan@ono.ac.il> wrote:
Dear Professor Pizer,
Yes, in Chrome, the Encoding is set to Unicode (UTF-8).
(I tested it in Mozilla FireFox, the same problem exists).
Sincerely yours,
Arie
From: arnoldpizer@gmail.com [mailto:arnoldpizer@gmail.com] On Behalf Of Arnold Pizer
Sent: Sunday, February 26, 2012 7:26 PM
To: arie poran
Cc: Jason Aubrey; John Wyatt; Rajiv Sood; Mike Gage; Arnold Pizer
Subject: Re: WebWork error message
OK. Thanks.
Just to make sure we are using the same setting, on Chrome under settings (the wrench icon), Tools, Encoding, I'm using Unicode (UTF-8). Is that what your setting is?
Arnie
On Sun, Feb 26, 2012 at 10:18 AM, arie poran <aporan@ono.ac.il> wrote:
Dear Professor Pizer,
On my course, I see the same error in both Chrome and IE browsers.
Sincerely yours,
Arie
From: arnoldpizer@gmail.com [mailto:arnoldpizer@gmail.com] On Behalf Of Arnold Pizer
Sent: Sunday, February 26, 2012 7:14 PM
To: arie poran
Cc: Jason Aubrey; Mike Gage; John Wyatt; Rajiv Sood; Arnold Pizer
Subject: Re: WebWork error message
Hi Arie,
This is a long shot but on the web I saw:
http://www.apache-httpd.com/list/39/972735.html
Hello, I am running apache2-mpm-prefork on ubuntu 11.04 with mod_perl. I have
googled as much as possible and it seems that in most cases its when there
is an upload that times out. I am not uploading anything but small json
objects. I only see this in my logs I have not been able to recreate it. The
one person I know who has this issue uses ie9 but google chrome is fine. Any
suggestions? I am at a loss
so try this on several different browsers.
Arnie
On Sun, Feb 26, 2012 at 10:10 AM, Arnold Pizer <apizer@math.rochester.edu> wrote:
Hi Arie,
Thanks for the test. I see the same error in apache's error log about ap_get_brigade failed during prefetch:
[Sun Feb 26 11:52:36 2012] [error] [client 95.86.123.59] (70007)The timeout specified has expired: ap_get_brigade failed during prefetch, referer: https://courses.webwork.maa.org/webwork2/pizer_course/instructor/sets/MAAtutorial/?effectiveUser=aporan&user=aporan&key=bruUyAh2BvLqieIT0oMoLtUGO5LZQSRo
Use of uninitialized value $string in substitution (s///) at /opt/webwork/webwork2/lib/Apache/WeBWorK.pm line 321.
[Sun Feb 26 11:52:36 2012] [error] [client 95.86.123.59] [/webwork2/pizer_course/instructor/sets/MAAtutorial/] Internal apreq error\n * in Apache2::Request::upload called at line 238 of /opt/webwork/webwork2/lib/WeBWorK.pm, referer: https://courses.webwork.maa.org/webwork2/pizer_course/instructor/sets/MAAtutorial/?effectiveUser=aporan&user=aporan&key=bruUyAh2BvLqieIT0oMoLtUGO5LZQSRo
No idea what's going on.
Arnie
On Sun, Feb 26, 2012 at 10:06 AM, arie poran <aporan@ono.ac.il> wrote:
Dear Professor Pizer,
No, I didn't do any changes in the course configuration.
I also do not know about any changes in the internet infrastructure.
(Regarding the character set, I see the same error message when I try to see the problems from the MAAtutorial set in your course in the images mode.)
Sincerely yours,
Arie
From: arnoldpizer@gmail.com [mailto:arnoldpizer@gmail.com] On Behalf Of Arnold Pizer
Sent: Sunday, February 26, 2012 6:59 PM
To: Jason Aubrey
Cc: arie poran; John Wyatt; Rajiv Sood; Mike Gage; Arnold Pizer
Subject: Re: WebWork error message
All,
The "Use of uninitialized value $string in substitution (s///) at /opt/webwork/webwork2/lib/Apache/WeBWorK.pm line 321." in the error msg in the apache2 error.log refers to
=item htmlEscape($string)
Protect characters that would be interpreted as HTML entities. Then, replace
line breaks with HTML "<br />" tags.
=cut
sub htmlEscape($) {
my ($string) = @_;
$string = encode_entities($string);
$string =~ s|\n|<br />|g;
return $string;
}
I don't think this is meaningful (not sure where htmlEscape is called) but as a long shot could it be there is some problem with character sets since Arie is in Israel?
Aria, has anything changed on your end recently?
Arnie
On Sun, Feb 26, 2012 at 9:46 AM, Jason Aubrey <aubreyja@missouri.edu> wrote:
All,
We have seen this error before:
http://webwork.maa.org/moodle/mod/forum/discuss.php?d=2510
Jason
Jason Aubrey, PhD Office: 219 Math Sciences
Department of Mathematics Office Phone: (573)882-4473
University of Missouri - Columbia Voice Mail: (573) 416-0784
Mailing Address:
202 Mathematical Sciences Department Fax: (573)882-1869
University of Missouri Department Phone: (573) 882-6221
Columbia, MO 65211 USA
SP12 Office Hours: MW 12:30-2, F 10:30-12
On Sun, Feb 26, 2012 at 10:41 AM, Jason Aubrey <aubreyja@missouri.edu> wrote:
Hi Arie,
Could you please add me (aubreyja) to your course as a professor temporarily so I can help debug this? (I can also add myself directly from the command line with your consent.)
Thanks,
Jason
Jason Aubrey, PhD Office: 219 Math Sciences
Department of Mathematics Office Phone: (573)882-4473
University of Missouri - Columbia Voice Mail: (573) 416-0784
Mailing Address:
202 Mathematical Sciences Department Fax: (573)882-1869
University of Missouri Department Phone: (573) 882-6221
Columbia, MO 65211 USA
SP12 Office Hours: MW 12:30-2, F 10:30-12
On Sun, Feb 26, 2012 at 10:28 AM, Arnold Pizer <apizer@math.rochester.edu> wrote:
Hi Arie and everybody else,
Arie, I see your error in /var/log/apache2/error.log
[Sun Feb 26 09:39:47 2012] [error] [client 95.86.123.59] (70007)The timeout specified has expired: ap_get_brigade failed during prefetch, referer: https://courses.webwork.maa.org/webwork2/ono_mathB/instructor/users/?effectiveUser=aporan&user=aporan&key=aRWGVWHz7TaPaEbuZ9XQmR3lQPyzavmP
Use of uninitialized value $string in substitution (s///) at /opt/webwork/webwork2/lib/Apache/WeBWorK.pm line 321.
[Sun Feb 26 09:39:47 2012] [error] [client 95.86.123.59] [/webwork2/ono_mathB/instructor/users/] Internal apreq error\n * in Apache2::Request::upload called at line 238 of /opt/webwork/webwork2/lib/WeBWorK.pm, referer: https://courses.webwork.maa.org/webwork2/ono_mathB/instructor/users/?effectiveUser=aporan&user=aporan&key=aRWGVWHz7TaPaEbuZ9XQmR3lQPyzavmP
I assume the real error is "ap_get_brigade failed during prefetch". Googling this error brings up a few things but nothing I saw that gave a cause or solution but I only searched for a few seconds.
Arie, just to make sure it's a system thing (although a strange one since I don't have a problem) and not something with your course, try to do something in my course (https://courses.webwork.maa.org/webwork2/pizer_course/). I added you as a prof (aporan/aporan).
Anybody else have ideas?
Arnie
On Sun, Feb 26, 2012 at 9:00 AM, arie poran <aporan@ono.ac.il> wrote:
Dear Professor Pizer,
Thank you very much for your answer.
In Classlist Editor I tried to perform the following action:
() Show [users who match] [Or-Yehuda] in their [Section]
[Take Action]
And I get the similar error message (shown below).
Is it possible that the error message is caused by my side ? It appears as a server error.
Please, excuse me for disturbing you so much.
Sincerely yours,
Arie
WeBWorK error
An error occured while processing your request. For help, please send mail to this site's webmaster ([no address given]), including all of the following information as well as what what you were doing when the error occured.
Sun Feb 26 10:58:33 2012
Warning messages
Error messages
Internal apreq error
Call stack
The information below can help locate the source of the problem.
in Apache2::Request::upload called at line 238 of /opt/webwork/webwork2/lib/WeBWorK.pm
Request information
Method
POST
URI
/webwork2/ono_mathB/instructor/users/
HTTP Headers
Accept-Charset
windows-1255,utf-8;q=0.7,*;q=0.3
User-Agent
Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.56 Safari/535.11
Accept
text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Connection
keep-alive
Referer
https://courses.webwork.maa.org/webwork2/ono_mathB/instructor/users/
Content-Length
43778
Accept-Encoding
gzip,deflate,sdch
Cache-Control
max-age=0
Origin
https://courses.webwork.maa.org
Content-Type
multipart/form-data; boundary=----WebKitFormBoundaryNuWMAzGeBSXnXvqt
Cookie
WeBWorKCourseAuthen.ono_mathB=aporan%09JiAbz7eb7TKS6zSpibFgOEXmM0F35Fgy
Accept-Language
he-IL,he;q=0.8,en-US;q=0.6,en;q=0.4
Host
courses.webwork.maa.org
From: arnoldpizer@gmail.com [mailto:arnoldpizer@gmail.com] On Behalf Of Arnold Pizer
Sent: Sunday, February 26, 2012 5:32 PM
To: arie poran
Cc: Michael Gage; Arnold Pizer
Subject: Re: WebWork error message
Hi Arie,
I just went onto your course (https://courses.webwork.maa.org/webwork2/ono_mathB/instructor/users/) and, using classlist, edited the "test1" user adding test1 as their first name. I figured that was pretty safe. I didn't get an error. Please try again and let us know if the problem persists.
Arnie
On Sun, Feb 26, 2012 at 7:47 AM, arie poran <aporan@ono.ac.il> wrote:
Dear Professor Gage and Professor Pizer,
Starting from 2/24/12 (approximately) we get the following error message, both from the Classlist Editor and from Homework editor. So we can not edit the list of the student, and we can not edit or assign homeworks.
Could you help, please.
Thank you in advance.
Sincerely yours,
Arie Fouren,
Ono Academic College,
Israel
WeBWorK error
An error occured while processing your request. For help, please send mail to this site's webmaster ([no address given]), including all of the following information as well as what what you were doing when the error occured.
Sun Feb 26 09:39:47 2012
Warning messages
Error messages
Internal apreq error
Call stack
The information below can help locate the source of the problem.
· in Apache2::Request::upload called at line 238 of /opt/webwork/webwork2/lib/WeBWorK.pm
Request information
Method
POST
URI
/webwork2/ono_mathB/instructor/users/
HTTP Headers
User-Agent
Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)
Accept
text/html, application/xhtml+xml, */*
Connection
Keep-Alive
Referer
https://courses.webwork.maa.org/webwork2/ono_mathB/instructor/users/?effectiveUser=aporan&user=aporan&key=aRWGVWHz7TaPaEbuZ9XQmR3lQPyzavmP
Content-Length
44440
Cache-Control
no-cache
Accept-Encoding
gzip, deflate
Content-Type
multipart/form-data; boundary=---------------------------7dc2f21f104bc
Accept-Language
he-IL
Host
courses.webwork.maa.org
--
Prof. Arnold K. Pizer
Dept. of Mathematics
University of Rochester
Rochester, NY 14627
(585) 766-8812