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#1: Apache2::Request appears to not capture the full POST:ed value

Posted on 2011-10-09 22:31:07 by Linus Lund

I have encountered a problem that I have been unable to solve using
documentation/google.=A0I'm running mod_perl 2 / (strawberry) perl
5.10.1 / Apache 2.2.20 on a Windows XP machine where I need to collect
data POSTed from a hardware (the Box) that I have no control over. The
Box is suppose to POST a semi colon separated list of data using a
field called value. I'm using Apache2::Request to parse the POST, but
it only captures the first part of the field (up until the first semi
colon).

My perl script looks like this;
sub handler {
=A0 =A0 my $r=3Dshift;
=A0 =A0 my $req =3D Apache2::Request->new($r);
=A0 =A0 $input =3D $req->param('value');
=A0 =A0 warn "INPUT is $input";
=A0 =A0 return Apache2::Const::OK;
}

And this is what I see in my logs;
[Sun Oct 09 22:08:20 2011] [notice] mod_dumpio: =A0dumpio_in
(data-HEAP): value=3Df1;2011-10-09;21:25:40;14;0;;0;0;3;1
[....]
INPUT is f1 at [...]

My thoughts on the problem is that it relates to URL encoding, as when
I send a direct query to the script it only fetches the whole part
when I encode the semi-colons. I have however not found a way to e.g.
mod_rewrite the POST content.
Any thoughts that could aid me?
THanks

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#2: Re: Apache2::Request appears to not capture the full POST:ed value

Posted on 2011-10-10 23:11:19 by aw

Linus Lund wrote:
> I have encountered a problem that I have been unable to solve using
> documentation/google. I'm running mod_perl 2 / (strawberry) perl
> 5.10.1 / Apache 2.2.20 on a Windows XP machine where I need to collect
> data POSTed from a hardware (the Box) that I have no control over. The
> Box is suppose to POST a semi colon separated list of data using a
> field called value. I'm using Apache2::Request to parse the POST, but
> it only captures the first part of the field (up until the first semi
> colon).
>
> My perl script looks like this;
> sub handler {
> my $r=shift;
> my $req = Apache2::Request->new($r);
> $input = $req->param('value');
> warn "INPUT is $input";
> return Apache2::Const::OK;
> }
>
> And this is what I see in my logs;
> [Sun Oct 09 22:08:20 2011] [notice] mod_dumpio: dumpio_in
> (data-HEAP): value=f1;2011-10-09;21:25:40;14;0;;0;0;3;1
> [....]
> INPUT is f1 at [...]
>
> My thoughts on the problem is that it relates to URL encoding, as when
> I send a direct query to the script it only fetches the whole part
> when I encode the semi-colons. I have however not found a way to e.g.
> mod_rewrite the POST content.
> Any thoughts that could aid me?
> THanks
>

I believe that at some point, a bare semi-colon was/is considered as an alternative to
"&", to separate post parameters.
So with the query string above, you probably have one parameter named "value" with a value
of "f1", then another parameter named "2011-10-09" with value null, then a parameter named
"21" with value null, etc...

There might be an option to Apache::Request to avoid this.

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#3: Re: Apache2::Request appears to not capture the full POST:ed value

Posted on 2011-10-11 00:43:17 by Jeff McCarrell

Andre is correct. Semi-colon is a valid query string separator,
in addition to ampersand &.
HTTP 1.x being so widely deployed, it is very hard to change the spec.
So supporting semi-colon is a W3C recommendation.

C.f. http://en.wikipedia.org/wiki/Query_string

-- jeff

On 10/10/11 2:11 PM, "Andr=E9 Warnier" <aw@ice-sa.com> wrote:

>I believe that at some point, a bare semi-colon was/is considered as an
>alternative to
>"&", to separate post parameters.
>

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