Apache2::Request Internal apreq error

evergreen has asked for the wisdom of the Perl Monks concerning the following question:

Hello monks,

I am using Apache2::Request to parse a multi-part Http post in a .mpl script running under apache mod_perl. The Http post comes from an upstream system.

Here is the relevant part of the script.

$r = shift;
$cgi = Apache2::Request->new($r);
$r->discard_request_body;   # efficiently parses the request body
my $parser_status = $cgi->param_status();
if ($parser_status ne 'Success')
{
    $parser_error = $parser_status;
}
[download]

The problem is that the call to param_status() returns "Internal apreq error" and further down in the script, it finds that an expected multi-part content is missing.

The post is retried by the upstream system until it succeeds, and after 10-15 retries it eventually succeeds, meaning there was no apreq error when it succeeded and the expected multi-part is present.

Is there any way to get more information about why there is an "Internal apreq error"?

Thanks.

Comment on Apache2::Request Internal apreq error Download Code

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Re: Apache2::Request Internal apreq error by thanos1983 (Parson) on Mar 14, 2019 at 09:05 UTC
Hello evergreen, My answer is not Perl related but my troubleshooting approach on this would be to capture a tcpdump (LinuxOS) if you are running on (WindowsOS) wireshark. By doing so you will see the package arriving and you will explicitly see what is the reply/error back. Update: From the documentation Apache2::Request/param this should give more data: `$req->args_status(1); # set error state for query-string parser ok $req->param_status == 1; $foo = $req->param("foo"); ok $foo == 1; eval { @foo = $req->param("foo") }; ok $@->isa("Apache2::Request::Error"); undef $@; eval { my $not_found = $req->param("non-existent-param") }; ok $@->isa("Apache2::Request::Error"); $req->args_status(0); # reset query-string parser state to "success"` [download] Hope this helps, BR. Seeking for Perl wisdom...on the process of learning...not there...yet!	[reply] [d/l] [select]
Re^2: Apache2::Request Internal apreq error by evergreen (Novice) on Mar 15, 2019 at 02:47 UTC
Thanks thanos1983, I tried tcpdump and Wireshark, but the content of the post requests looks good and the multi-part attachments are there, but somehow it is not being parsed. I also see this in apache error log: `[Thu Mar 14 18:40:04 2019] [error] [client 17.108.244.6] (70008)Partia +l results are valid but processing is incomplete: ap_get_brigade fail +ed during prefetch [Thu Mar 14 18:40:04 2019] [error] Internal apreq error` [download] Will update here if I find anything.	[reply] [d/l]
Re^3: Apache2::Request Internal apreq error by thanos1983 (Parson) on Mar 15, 2019 at 07:01 UTC
Hello again evergreen, There are many reports regarding this error see below: 1) Stuck in "Partial results are valid but processing is incomplete" #62 2) Apache 2.2: Partial results are valid but processing is incomplete, unable to stat file (X-Sendfile) 3) proxy_fcgi:error (70008)Partial results are valid but processing is incomplete. AH01075 4) Bug 55475 - mod_proxy breaks HTTP chunked transfer coding etc... etc... Can you download the latest version of Apache (server) / Apache2::Request (client) and try again? I do not believe that the bug comes from the client side it looks it is coming from the server side. My recommendation is to update both on the latest version (theoretically the bug is fixed) and try again. Hopefully after you should not see this problem any more. Hope this helps, BR. Seeking for Perl wisdom...on the process of learning...not there...yet!	[reply] [d/l] [select]