Mailing List Archive: mod_proxy_fcgi bug using CONTENT_LENGTH and Transfer-Encoding chunked

mod_proxy_fcgi bug using CONTENT_LENGTH and Transfer-Encoding chunked

Jun 16, 2020, 2:57 PM

Post #1 of 6 (553 views)

Hi,

I wanted to politely ask if anyone could take a look at https://bz.apache.org/bugzilla/show_bug.cgi?id=57087 <https://bz.apache.org/bugzilla/show_bug.cgi?id=57087>. This is an issue where CONTENT_LENGTH isn’t forwarded correctly when using Transfer-Encoding chunked. I feel uncomfortable bumping an issue in this mailing list, but it’s been open since 2014, and I’m not sure where else to ask.

In the real world, this is causing issues for me when uploading to a Nextcloud instance through macOS finder. Files are uploaded with a size of 0b and macOS shows an error. There’s an issue here which shows some instances of people running in to it: https://github.com/nextcloud/nextcloud-snap/issues/365 <https://github.com/nextcloud/nextcloud-snap/issues/365>.

For reference, the same issue was fixed in mod_fcgid a while back: https://bz.apache.org/bugzilla/show_bug.cgi?id=53332 <https://bz.apache.org/bugzilla/show_bug.cgi?id=53332> and https://bz.apache.org/bugzilla/show_bug.cgi?id=50274 <https://bz.apache.org/bugzilla/show_bug.cgi?id=50274>

It would be great if anyone could take a look at this, and see if it is feasible to fix in the near future. The only alternative I can think of is moving my installation away from mod_fcgid.

As a final note, I did consider the user mailing list, but I get the impression few developers look there. Hoping I made the right call.

Kind regards,
Oliver

Re: mod_proxy_fcgi bug using CONTENT_LENGTH and Transfer-Encoding chunked [ In reply to ]

rpluem at apache

Jun 16, 2020, 11:21 PM

Post #2 of 6 (552 views)

Permalink

On 6/16/20 11:57 PM, Oliver Dunk wrote:
> Hi,
>
> I wanted to politely ask if anyone could take a look at https://bz.apache.org/bugzilla/show_bug.cgi?id=57087. This is an issue
> where CONTENT_LENGTH isn’t forwarded correctly when using Transfer-Encoding chunked. I feel uncomfortable bumping an issue in this
> mailing list, but it’s been open since 2014, and I’m not sure where else to ask.
>

Giving us a notch here was the correct thing to do in this case. You follow the PPP (Patient, Polite, Persistent) pattern here.

Regards

Rüdiger

Re: mod_proxy_fcgi bug using CONTENT_LENGTH and Transfer-Encoding chunked [ In reply to ]

oliver at oliverdunk

Jun 22, 2020, 6:00 AM

Post #3 of 6 (545 views)

Permalink

Just wanted to resurface this one. I posted it last week, but there hasn’t been any activity yet. I’d still love someone to take a look if they have a minute.

Kind regards,
Oliver

> On 16 Jun 2020, at 22:57, Oliver Dunk <oliver@oliverdunk.com> wrote:
>
> Hi,
>
> I wanted to politely ask if anyone could take a look at https://bz.apache.org/bugzilla/show_bug.cgi?id=57087 <https://bz.apache.org/bugzilla/show_bug.cgi?id=57087>. This is an issue where CONTENT_LENGTH isn’t forwarded correctly when using Transfer-Encoding chunked. I feel uncomfortable bumping an issue in this mailing list, but it’s been open since 2014, and I’m not sure where else to ask.
>
> In the real world, this is causing issues for me when uploading to a Nextcloud instance through macOS finder. Files are uploaded with a size of 0b and macOS shows an error. There’s an issue here which shows some instances of people running in to it: https://github.com/nextcloud/nextcloud-snap/issues/365 <https://github.com/nextcloud/nextcloud-snap/issues/365>.
>
> For reference, the same issue was fixed in mod_fcgid a while back: https://bz.apache.org/bugzilla/show_bug.cgi?id=53332 <https://bz.apache.org/bugzilla/show_bug.cgi?id=53332> and https://bz.apache.org/bugzilla/show_bug.cgi?id=50274 <https://bz.apache.org/bugzilla/show_bug.cgi?id=50274>
>
> It would be great if anyone could take a look at this, and see if it is feasible to fix in the near future. The only alternative I can think of is moving my installation away from mod_fcgid.
>
> As a final note, I did consider the user mailing list, but I get the impression few developers look there. Hoping I made the right call.
>
> Kind regards,
> Oliver

Re: mod_proxy_fcgi bug using CONTENT_LENGTH and Transfer-Encoding chunked [ In reply to ]

toscano.luca at gmail

Jun 27, 2020, 5:53 AM

Post #4 of 6 (537 views)

Permalink

Hi Oliver,

your request was duly noted, we might get somebody to look at this
during the next days/weeks, but we can't promise anything. The bug is
sadly not as simple as adding a line of code (see comments in bz
57087), plus the current dev resources have limited bandwidth.

Thanks for following up,

Luca

On Mon, Jun 22, 2020 at 3:00 PM Oliver Dunk <oliver@oliverdunk.com> wrote:
>
> Just wanted to resurface this one. I posted it last week, but there hasn’t been any activity yet. I’d still love someone to take a look if they have a minute.
>
> Kind regards,
> Oliver
>
> On 16 Jun 2020, at 22:57, Oliver Dunk <oliver@oliverdunk.com> wrote:
>
> Hi,
>
> I wanted to politely ask if anyone could take a look at https://bz.apache.org/bugzilla/show_bug.cgi?id=57087. This is an issue where CONTENT_LENGTH isn’t forwarded correctly when using Transfer-Encoding chunked. I feel uncomfortable bumping an issue in this mailing list, but it’s been open since 2014, and I’m not sure where else to ask.
>
> In the real world, this is causing issues for me when uploading to a Nextcloud instance through macOS finder. Files are uploaded with a size of 0b and macOS shows an error. There’s an issue here which shows some instances of people running in to it: https://github.com/nextcloud/nextcloud-snap/issues/365.
>
> For reference, the same issue was fixed in mod_fcgid a while back: https://bz.apache.org/bugzilla/show_bug.cgi?id=53332 and https://bz.apache.org/bugzilla/show_bug.cgi?id=50274
>
> It would be great if anyone could take a look at this, and see if it is feasible to fix in the near future. The only alternative I can think of is moving my installation away from mod_fcgid.
>
> As a final note, I did consider the user mailing list, but I get the impression few developers look there. Hoping I made the right call.
>
> Kind regards,
> Oliver
>
>

Re: mod_proxy_fcgi bug using CONTENT_LENGTH and Transfer-Encoding chunked [ In reply to ]

tom.browder at gmail

Jun 27, 2020, 6:18 AM

Post #5 of 6 (537 views)

Permalink

On Sat, Jun 27, 2020 at 07:54 Luca Toscano <toscano.luca@gmail.com> wrote:

> Hi Oliver,
>
> your request was duly noted, we might get somebody to look at this
> during the next days/weeks, but we can't promise anything. The bug is
> sadly not as simple as adding a line of code (see comments in bz
> 57087), plus the current dev resources have limited bandwidth.
>

I was just investigating moving to fast cgi from cgi and this caught my
attention.

Will affect non-php code? Can I avoid chunking files if necessary to work
around the bug?

Thanks.

Best regards,

-Tom

Re: mod_proxy_fcgi bug using CONTENT_LENGTH and Transfer-Encoding chunked [ In reply to ]

oliver at oliverdunk

Jun 29, 2020, 4:29 AM

Post #6 of 6 (534 views)

Permalink

Luca, thanks for the response. What you’re saying makes total sense, so no worries at all.

Tom, I won’t try to answer your questions, because I could only provide an educated guess at the answers :)

> On 27 Jun 2020, at 14:18, Tom Browder <tom.browder@gmail.com> wrote:
>
> On Sat, Jun 27, 2020 at 07:54 Luca Toscano <toscano.luca@gmail.com <mailto:toscano.luca@gmail.com>> wrote:
> Hi Oliver,
>
> your request was duly noted, we might get somebody to look at this
> during the next days/weeks, but we can't promise anything. The bug is
> sadly not as simple as adding a line of code (see comments in bz
> 57087), plus the current dev resources have limited bandwidth.
>
> I was just investigating moving to fast cgi from cgi and this caught my attention.
>
> Will affect non-php code? Can I avoid chunking files if necessary to work around the bug?
>
> Thanks.
>
> Best regards,
>
> -Tom
>