post - all empty?

[Josef Chladek-2]

hi list,

I have a strange problem, that occurs for some clients, for most not:  
we have a form, that is setup  by javascript dynamically (form  
consits of one input field, one textarea and 2 hidden fields)

...
form.setAttribute('action','/cat/postings/post_comment');
form.setAttribute('id','input_form');
form.setAttribute('name','input_form');
form.setAttribute('method','post');
form.setAttribute('enctype','multipart/form-data');
form.setAttribute('accept-charset','utf-8');
form.setAttribute('onSubmit', 'return check(' + parent + ')');
...

as said, most of the time it works without a problem, but sometimes I  
get the following error:

[error] Caught exception in engine "Wrong Content-Length value: xxx  
at /usr/local/share/perl/5.8.8/Catalyst.pm line 1636"

which is thrown from Enigne.pm

# paranoia against wrong Content-Length header
my $remaining = $length - $self->read_position;
if ( $remaining > 0 ) {
     $self->finalize_read($c);
     Catalyst::Exception->throw(
        "Wrong Content-Length value: $length" );
}

from debugging I found out, that $remaining in fact is $length, so it  
seems, that nothing was read from the post body

HTTP::Body is version 0.9, I changed multipart/form-data to  
application/x-www-form-urlencoded, still no effect.
to see the form, you have to be logged in, which works fine, I can  
identify the user from the session, so cookie etc. working fine

any clue what could happen here?

thanks
josef

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[Christopher H. Laco]

Josef Chladek wrote:

> hi list,
>
> I have a strange problem, that occurs for some clients, for most not: we
> have a form, that is setup  by javascript dynamically (form consits of
> one input field, one textarea and 2 hidden fields)
>
> ...
> form.setAttribute('action','/cat/postings/post_comment');
> form.setAttribute('id','input_form');
> form.setAttribute('name','input_form');
> form.setAttribute('method','post');
> form.setAttribute('enctype','multipart/form-data');
> form.setAttribute('accept-charset','utf-8');
> form.setAttribute('onSubmit', 'return check(' + parent + ')');
> ...
>
> as said, most of the time it works without a problem, but sometimes I
> get the following error:
>
> [error] Caught exception in engine "Wrong Content-Length value: xxx at
> /usr/local/share/perl/5.8.8/Catalyst.pm line 1636"
>
> which is thrown from Enigne.pm
>
> # paranoia against wrong Content-Length header
> my $remaining = $length - $self->read_position;
> if ( $remaining > 0 ) {
>     $self->finalize_read($c);
>     Catalyst::Exception->throw(
>        "Wrong Content-Length value: $length" );
> }
>
> from debugging I found out, that $remaining in fact is $length, so it
> seems, that nothing was read from the post body
>
> HTTP::Body is version 0.9, I changed multipart/form-data to
> application/x-www-form-urlencoded, still no effect.
> to see the form, you have to be logged in, which works fine, I can
> identify the user from the session, so cookie etc. working fine
>
> any clue what could happen here?
>
> thanks
> josef

If the Content-Length really is 0, I've found one thing over the years
that does it. Older Mozilla/Netscape versions, usually CompuServe
branded versions, would not POST and content of a form if javascript set
the forms style to display:none or hidden in CSS.

In my case, if was the usual tinkerage of hiding the form and displaying
a "Now processing" image when a user clicked the Submit button.

To this day, I still get the occasional Content-Length: 0 from these
browsers...about 5 a week.

Just a thought.

-=Chris



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[Josef Chladek-2]

Am 07.09.2007 um 16:44 schrieb Christopher H. Laco:

> Josef Chladek wrote:
>> hi list,
>>
>> I have a strange problem, that occurs for some clients, for most  
>> not: we
>> have a form, that is setup  by javascript dynamically (form  
>> consits of
>> one input field, one textarea and 2 hidden fields)
>>
>> ...
>> form.setAttribute('action','/cat/postings/post_comment');
>> form.setAttribute('id','input_form');
>> form.setAttribute('name','input_form');
>> form.setAttribute('method','post');
>> form.setAttribute('enctype','multipart/form-data');
>> form.setAttribute('accept-charset','utf-8');
>> form.setAttribute('onSubmit', 'return check(' + parent + ')');
>> ...
>>
>> as said, most of the time it works without a problem, but sometimes I
>> get the following error:
>>
>> [error] Caught exception in engine "Wrong Content-Length value:  
>> xxx at
>> /usr/local/share/perl/5.8.8/Catalyst.pm line 1636"
>>
>> which is thrown from Enigne.pm
>>
>> # paranoia against wrong Content-Length header
>> my $remaining = $length - $self->read_position;
>> if ( $remaining > 0 ) {
>>     $self->finalize_read($c);
>>     Catalyst::Exception->throw(
>>        "Wrong Content-Length value: $length" );
>> }
>>
>> from debugging I found out, that $remaining in fact is $length, so it
>> seems, that nothing was read from the post body
>>
>> HTTP::Body is version 0.9, I changed multipart/form-data to
>> application/x-www-form-urlencoded, still no effect.
>> to see the form, you have to be logged in, which works fine, I can
>> identify the user from the session, so cookie etc. working fine
>>
>> any clue what could happen here?
>>
>> thanks
>> josef
>
> If the Content-Length really is 0, I've found one thing over the years
> that does it. Older Mozilla/Netscape versions, usually CompuServe
> branded versions, would not POST and content of a form if  
> javascript set
> the forms style to display:none or hidden in CSS.
>
> In my case, if was the usual tinkerage of hiding the form and  
> displaying
> a "Now processing" image when a user clicked the Submit button.
>
> To this day, I still get the occasional Content-Length: 0 from these
> browsers...about 5 a week.
>
> Just a thought.

hmm, I dumped req->headers and this happens for IE7, IE6 and FF2.x,  
so not the oldest browsers.
I temp. switched to method get now, think that will work.
any hints on how I could get closer to the problem, where should I  
put debug code, somewhere in Engine.pm or Catalyst.pm?

thanks
josef

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[Bill Moseley]

On Fri, Sep 07, 2007 at 04:26:56PM +0200, Josef Chladek wrote:
> from debugging I found out, that $remaining in fact is $length, so it  
> seems, that nothing was read from the post body

Are you using SSL? This is way old and doesn't seem to fit your case,
but some old versions of IE post with zero content length.

    http://support.microsoft.com/default.aspx?kbid=831167

It's amazing that I still see this every so often.

--
Bill Moseley
moseley@...


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[Josef Chladek-2]

Am 07.09.2007 um 21:24 schrieb Bill Moseley:

> On Fri, Sep 07, 2007 at 04:26:56PM +0200, Josef Chladek wrote:
>> from debugging I found out, that $remaining in fact is $length, so it
>> seems, that nothing was read from the post body
>
> Are you using SSL? This is way old and doesn't seem to fit your case,
> but some old versions of IE post with zero content length.
>
>     http://support.microsoft.com/default.aspx?kbid=831167
>
> It's amazing that I still see this every so often.

nope, plain http, no ssl involved. and it happens for firefox as well.

I could throw/show an error page, but I can't even display the user-
input on that page (because there is none), which is a pity, because  
it's a message-board, so the message is gone after submit...
method get is not perfect (long postings will be cut off).

thanks
josef

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[Josef Chladek-2]

Am 07.09.2007 um 21:48 schrieb Josef Chladek:

> Am 07.09.2007 um 21:24 schrieb Bill Moseley:
>
>> On Fri, Sep 07, 2007 at 04:26:56PM +0200, Josef Chladek wrote:
>>> from debugging I found out, that $remaining in fact is $length,  
>>> so it
>>> seems, that nothing was read from the post body
>>
>> Are you using SSL? This is way old and doesn't seem to fit your case,
>> but some old versions of IE post with zero content length.
>>
>>     http://support.microsoft.com/default.aspx?kbid=831167
>>
>> It's amazing that I still see this every so often.
>
> nope, plain http, no ssl involved. and it happens for firefox as well.
>
> I could throw/show an error page, but I can't even display the user-
> input on that page (because there is none), which is a pity,  
> because it's a message-board, so the message is gone after submit...
> method get is not perfect (long postings will be cut off).

if someone is interested:
I switched to fastcgi (instead of mod_perl) and the problem ist gone...

josef

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