Hi Tom, I have a hard time believing this doesn't work with pass, but let's check.
Would you be able to run `varnishlig -g raw` as the transaction is going on ? (You don't want extra traffic otherwise things will be hard to follow) -- Guillaume Quintard On Mon, Jun 23, 2025, 08:31 Tom Anheyer | BerlinOnline < [email protected]> wrote: > Good morning, > > OK, one more. Server-Sent-Events are streaming GET requests. I've tried > > sub vcl_recv { > > … > > return(pass); > > } > > > sub vcl_backend_fetch { > > set bereq.first_byte_timeout = 30s; > > set bereq.between_bytes_timeout = 30s; > > } > > > sub vcl_backend_response { > > set beresp.do_esi = false; > > set beresp.do_stream = true; > > } > > > without success. The request is forwarded to the SSE server but comes > never back and does not show up in varnishlog. Is there any chance to get > this work without `pipe`? > > thanks in advance > tom > > Am Freitag, dem 20.06.2025 um 15:05 +0200 schrieb Guillaume Quintard: > > Always a pleasure! Let us know if you have any further questions! > > -- > Guillaume Quintard > > On Fri, Jun 20, 2025, 13:30 Tom Anheyer | BerlinOnline < > [email protected]> wrote: > > > Hi Guillaume, > > thank you for your very quick (as always) and clear answer. > > tom > > Am Freitag, dem 20.06.2025 um 11:37 +0200 schrieb Guillaume Quintard: > > Hi Tom, > > This is a base behavior, so Varnish Enterprise inherits it, but it's > present > > in Varnish Cache too. > > Piping involves foregoing HTTP parsing and just passing all the > connection > > bytes back and forth. It's possible on HTTP 1.x since there's only at > most one > > request per connection, but this breaks with HTTP2 multiplexing, so > Varnish > > does the best thing it can and uses a pass instead. > > Interestingly, H/2 didn't plan an upgrade path to websockets (or to > anything > > else, really) for a relatively sane reason: H/2 requires TLS and TLS has > ALPN > > that allows you to go to websockets directly, without the upgrade hop. > > So, to my (maybe outdated) knowledge of H/2, upgrading to websockets > isn't > > possible. > > Please let me know if I'm not being clear. > > -- > > Guillaume Quintard > > > > On Fri, Jun 20, 2025, 11:15 Tom Anheyer | BerlinOnline > > <[email protected]> wrote: > > > Hello, > > > > > > I don't know if this is specific to varnish plus: > > > > > > > > > If I enable pipe-mode for server sent events in vcl_recv this way: > > > > > > if (…) { > > > set req.http.connection = "close"; > > > return(pipe); > > > } > > > > > > the log shows: > > > > > > - VCL_return pipe > > > - VCL_call HASH > > > - VCL_return lookup > > > - VCL_Error vcl_recv{} returns pipe/connect for HTTP/2 request. > > > Doing pass. > > > - VCL_call PASS > > > > > > > > > Is it possible to use server sent events, websockets with http/2 > requests? > > > > > > > > > I've opened a varnish software ticket but I thin > <https://www.google.com/maps/search/pened+a+varnish+software+ticket+but+I+thin?entry=gmail&source=g>k > that's public interest. > > > > > > tom > > > > > > -- > > Tom Anheyer > Senior Developer > > BerlinOnline GmbHStefan-Heym-Platz 1 > 10367 Berlin > Germany > <https://www.google.com/maps/search/Stefan-Heym-Platz+1%0D%0A10367+Berlin%0D%0AGermany?entry=gmail&source=g> > > Tel.: +49-30-5771180-62 > Fax: +49 30 5771180-95 > E-Mail: [email protected] > berlin.de | berlinonline.net > > Amtsgericht Berlin-Charlottenburg, HRB 266384 > Sitz der Gesellschaft: Berlin, Deutschland > USt.-IdNr.: DE219483549 > > Geschäftsführung: Andreas Mängel, Katrin Dorgeist > Vorsitzender des Aufsichtsrats: Nicolas Zimmer > > > >
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