I've carried out more experiments to find out the source of the zero request_id problem, without success. There is an important detail: I use FFI library (urweb-callback) to spawn async jobs from custom worker threads. Those threads do run uw_begin/uw_commit/uw_rollback (and eventually call [send] on stored channels), but they don't handle normal http requests and AFAIK should never trigger calls to fastcgi_write method. Please tell me if I am wrong and uw_begin may actually result in call to fastcgi_write.
Besides that, I tracked another issue regarding socket inheritance by child processes due to missing CLOEXEC flag. Here is the pull request https://github.com/urweb/urweb/pull/75 Regards, Sergey 2017-04-15 1:46 GMT+03:00 Sergey Mironov <grr...@gmail.com>: > Yes, I am able to reproduce the error with the latest Ur/Web. I've > checked the related code and didn't find any obvious errors. But, if I > replace the following assignment > o->r.requestIdB0 = current_request_id & 0x000000ff; > with the assignment to 1, the error disappears. > > Very strange. > > Regards, > Sergey > > > 2017-04-14 18:28 GMT+03:00 Benjamin Barenblat <benja...@barenblat.name>: >> On Thu, Apr 13, 2017 at 6:35 PM, Sergey Mironov <grr...@gmail.com> wrote: >>> I am facing a problem running the application compiled in FastCGI mode >>> with nginx. The error on server says >>> >>> 2017/04/14 01:19:13 [error] 11847#0: *2 upstream sent unexpected >>> FastCGI request id low byte: 0 while reading response header from >>> upstream, client: 127.0.0.1, server: , request: "POST /.msgs >>> HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: >>> "127.0.0.1:8081", referrer: "http://127.0.0.1:8081/App/convertFile/48" >> >> That sounds suspiciously like >> <https://github.com/urweb/urweb/issues/57>. Are you running the latest >> version of Ur/Web? >> >> _______________________________________________ >> Ur mailing list >> Ur@impredicative.com >> http://www.impredicative.com/cgi-bin/mailman/listinfo/ur _______________________________________________ Ur mailing list Ur@impredicative.com http://www.impredicative.com/cgi-bin/mailman/listinfo/ur