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#1: MP2 - ("did not send an HTTP header")

Posted on 2005-07-12 00:14:01 by Bill Whillers

Ugh. We have CGI scripts that were ported a while ago to MP 1x and seemed to
work fine at that time but now we've set up an MP 2 environment and are
seeing "did not send an HTTP header" (everywhere), such as with:

print "Location: $url\n\n";

(All CGI code here uses the same common method to produce standard headers)

What is confusing is that sometimes pages return fine.

Is there something I'm missing or should verify/check? -- (httpd.conf does use
PerlOptions +ParseHeaders).


BW

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#2: re: MP2 - ("did not send an HTTP header")

Posted on 2005-07-12 01:25:19 by kmcgrail

Bill:

I am having the same problem. I thought it stemmed from the $|++ that we
used to turn off buffering but that doesn't seem to be it for us.

See
http://perl.apache.org/docs/2.0/user/coding/coding.html#Gene rating_HTTP_Response_Headers
for a hint but I haven't fixed it and I haven't turned on assbackwards
method either.

Regards,
KAM

----- Original Message -----
From: "Bill Whillers" <mod_perl@whohasit.com>
To: <modperl@perl.apache.org>
Sent: Monday, July 11, 2005 6:14 PM
Subject: MP2 - ("did not send an HTTP header")


> Ugh. We have CGI scripts that were ported a while ago to MP 1x and seemed
to
> work fine at that time but now we've set up an MP 2 environment and are
> seeing "did not send an HTTP header" (everywhere), such as with:
>
> print "Location: $url\n\n";
>
> (All CGI code here uses the same common method to produce standard
headers)
>
> What is confusing is that sometimes pages return fine.
>
> Is there something I'm missing or should verify/check? -- (httpd.conf does
use
> PerlOptions +ParseHeaders).
>
>
> BW
>

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#3: Re: MP2 - ("did not send an HTTP header")

Posted on 2005-07-12 20:48:17 by Bill Whillers

Can someone on the list share any information about this?

Without modification, our scripts work fine until they generate a Cookie,
Location header or other header using our own methods (without using $r).

> because I'd like to move towards more native MP code anyway!
ditto.

Thanks Kevin


----- Original Message -----
From: "Kevin A. McGrail" <kmcgrail@pccc.com>
To: "Bill Whillers" <mod_perl@whohasit.com>
Sent: Tuesday, July 12, 2005 5:37 AM
Subject: Re: MP2 - ("did not send an HTTP header")

> I've gotten the opinion so far that this is more of an Apache2 and not a
> MP2 issue. That's why the $r->assbackwards method is really
> re-configuring an Apache2 core method.
>
> But I agree that this was very annoying because I had hoped to switch
> several scripts that would benefit from perlrun/registry but believe I
> will need to now hunt down the content-type/location/cookie/etc. code that
> is outputted and use the mp2 header methodology to avoid the did not send
> HTTP header error from the Apache core.
>
> The reason I haven't delved deeper is that I believe the issue should be
> fixed fairly simply with some code like this:
>
> if (MP2) {
> $r->err_headers_out(whatever=>'something');
> } else {
> print "Content-type: text/html\n";
> }
>
> This is probably a "good thing" because I'd like to move towards more
> native MP code anyway!
>
> Regards,
> KAM
>
> ----- Original Message -----
> From: Bill Whillers <mod_perl@whohasit.com>
> To: "Kevin A. McGrail" <kmcgrail@pccc.com>
> Sent: Monday, July 11, 2005 10:38 PM
> Subject: Re: MP2 - ("did not send an HTTP header")
>
>> Thanks. This seems to have become a big can of worms-- much more involved
>> than
>> moving CGI to MP1x. Unless I have some revelation that does not involve
>> re-writing or a severe re-architect of what we've got, I'll abandon this
>> project and just stick to MP-1.99.
>>
>> I'm having trouble finding anything that even touches on why we're
>> hitting
>> trouble that did not seem to exist in earlier revs. The "META" comments
>> seem
>> to pick up right where I need more info.
>>
>> Of course, if I find something, I'll post it.

-------------------------------------------------------

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#4: Re: MP2 - ("did not send an HTTP header")

Posted on 2005-07-12 20:59:07 by Geoffrey Young

Bill Whillers wrote:
> Can someone on the list share any information about this?

please file a proper bug report:

http://perl.apache.org/bugs/

specifically, running t/REPORT will let us know which versions of CGI.pm and
mod_perl you're using so we don't need to guess.

--Geoff

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#5: Re: MP2 - ("did not send an HTTP header")

Posted on 2005-07-12 22:12:33 by Bill Whillers

Thanks Geoff,

I'm not suggesting this is a 'bug' at this point however I'd like to find (or
solicit) more info about this.

The is some kind of buffering issue. I've isolated that this only happens
serving pages exceeding a specific size (7716 bytes) (??).

httpd.conf uses:

<Location /test/>
SetHandler perl-script
PerlResponseHandler ModPerl::Registry
PerlOptions +ParseHeaders
Options +ExecCGI
</Location>


Thanks

On Tuesday 12 July 2005 11:59, Geoffrey Young wrote:
> Bill Whillers wrote:
> > Can someone on the list share any information about this?
>
> please file a proper bug report:
>
> http://perl.apache.org/bugs/
>
> specifically, running t/REPORT will let us know which versions of CGI.pm
> and mod_perl you're using so we don't need to guess.
>
> --Geoff

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#6: Re: MP2 - ("did not send an HTTP header")

Posted on 2005-07-12 22:22:42 by Bill Whillers

The test machine is running:

CGI 3.10
Apache/2.0.54 (Unix)
mod_perl/2.0.1
Perl/v5.8.5


On Tuesday 12 July 2005 13:12, Bill Whillers wrote:
> Thanks Geoff,
>
> I'm not suggesting this is a 'bug' at this point however I'd like to find
> (or solicit) more info about this.
>
> The is some kind of buffering issue. I've isolated that this only happens
> serving pages exceeding a specific size (7716 bytes) (??).
>
> httpd.conf uses:
>
> <Location /test/>
> SetHandler perl-script
> PerlResponseHandler ModPerl::Registry
> PerlOptions +ParseHeaders
> Options +ExecCGI
> </Location>
>
>
> Thanks
>
> On Tuesday 12 July 2005 11:59, Geoffrey Young wrote:
> > Bill Whillers wrote:
> > > Can someone on the list share any information about this?
> >
> > please file a proper bug report:
> >
> > http://perl.apache.org/bugs/
> >
> > specifically, running t/REPORT will let us know which versions of CGI.pm
> > and mod_perl you're using so we don't need to guess.
> >
> > --Geoff

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#7: Re: MP2 - ("did not send an HTTP header")

Posted on 2005-07-13 01:03:42 by Bill Whillers

OK... life is better after re-visiting:

<http://perl.apache.org/docs/2.0/user/coding/coding.html#Generating_HTTP_Response_Headers>

and just using:
use Apache2::RequestRec ();
$r=Apache2::RequestUtil->request;
$r->content_type($mime_type);

in the few places where these scripts print their own headers.

I've yet to rewrite/replace the other areas where they print headers (i.e.
Cookies, Redirects, etc.) and plan to use something like:

use Apache2::Const -compile => qw(REDIRECT);
$r->headers_out->set(Location => $location);
return Apache2::Const::REDIRECT;

but for now, it appears that we're on the right track.

Hope this thread can help others.



On Tuesday 12 July 2005 13:22, Bill Whillers wrote:
> The test machine is running:
>
> CGI 3.10
> Apache/2.0.54 (Unix)
> mod_perl/2.0.1
> Perl/v5.8.5
>
> On Tuesday 12 July 2005 13:12, Bill Whillers wrote:
> > Thanks Geoff,
> >
> > I'm not suggesting this is a 'bug' at this point however I'd like to find
> > (or solicit) more info about this.
> >
> > The is some kind of buffering issue. I've isolated that this only happens
> > serving pages exceeding a specific size (7716 bytes) (??).
> >
> > httpd.conf uses:
> >
> > <Location /test/>
> > SetHandler perl-script
> > PerlResponseHandler ModPerl::Registry
> > PerlOptions +ParseHeaders
> > Options +ExecCGI
> > </Location>
> >
> >
> > Thanks
> >
> > On Tuesday 12 July 2005 11:59, Geoffrey Young wrote:
> > > Bill Whillers wrote:
> > > > Can someone on the list share any information about this?
> > >
> > > please file a proper bug report:
> > >
> > > http://perl.apache.org/bugs/
> > >
> > > specifically, running t/REPORT will let us know which versions of
> > > CGI.pm and mod_perl you're using so we don't need to guess.
> > >
> > > --Geoff

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