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Changed keepalive_requests default to 1000 (ticket #2155). It turns out no browsers implement HTTP/2 GOAWAY handling properly, and large enough number of resources on a page results in failures to load some resources. In particular, Chrome seems to experience errors if loading of all resources requires more than 1 connection (while it is usually able to retry requests at least once, even with 2 connections there are occasional failures for some reason), Safari if loading requires more than 3 connections, and Firefox if loading requires more than 10 connections (can be configured with network.http.request.max-attempts, defaults to 10). It does not seem to be possible to resolve this on nginx side, even strict limiting of maximum concurrency does not help, and loading issues seems to be triggered by merely queueing of a request for a particular connection. The only available mitigation seems to use higher keepalive_requests value. The new default is 1000 and matches previously used default for http2_max_requests. It is expected to be enough for 99.98% of the pages (https://httparchive.org/reports/state-of-the-web?start=latest#reqTotal) even in Chrome.
author Maxim Dounin <mdounin@mdounin.ru>
date Thu, 08 Apr 2021 00:16:30 +0300
parents 9fb994513776
children
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# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


have=NGX_DARWIN . auto/have_headers

CORE_INCS="$UNIX_INCS"
CORE_DEPS="$UNIX_DEPS $DARWIN_DEPS"
CORE_SRCS="$UNIX_SRCS $DARWIN_SRCS"



ngx_spacer='
'

MAIN_LINK=
MODULE_LINK="-shared -Wl,-undefined,dynamic_lookup"

CC_AUX_FLAGS="$CC_AUX_FLAGS -D__APPLE_USE_RFC_3542"


# kqueue

echo " + kqueue found"
have=NGX_HAVE_KQUEUE . auto/have
have=NGX_HAVE_CLEAR_EVENT . auto/have
EVENT_MODULES="$EVENT_MODULES $KQUEUE_MODULE"
CORE_SRCS="$CORE_SRCS $KQUEUE_SRCS"
EVENT_FOUND=YES
NGX_KQUEUE_CHECKED=YES

ngx_feature="kqueue's EVFILT_TIMER"
ngx_feature_name="NGX_HAVE_TIMER_EVENT"
ngx_feature_run=yes
ngx_feature_incs="#include <sys/event.h>
                  #include <sys/time.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="int      kq;
                  struct kevent    kev;
                  struct timespec  ts;

                  if ((kq = kqueue()) == -1) return 1;

                  kev.ident = 0;
                  kev.filter = EVFILT_TIMER;
                  kev.flags = EV_ADD|EV_ENABLE;
                  kev.fflags = 0;
                  kev.data = 1000;
                  kev.udata = 0;

                  ts.tv_sec = 0;
                  ts.tv_nsec = 0;

                  if (kevent(kq, &kev, 1, &kev, 1, &ts) == -1) return 1;

                  if (kev.flags & EV_ERROR) return 1;"

. auto/feature


ngx_feature="Darwin 64-bit kqueue millisecond timeout bug"
ngx_feature_name=NGX_DARWIN_KEVENT_BUG
ngx_feature_run=bug
ngx_feature_incs="#include <sys/event.h>
                  #include <sys/time.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="int  kq;
                  struct kevent    kev;
                  struct timespec  ts;
                  struct timeval   tv, tv0;

                  kq = kqueue();

                  ts.tv_sec = 0;
                  ts.tv_nsec = 999000000;

                  gettimeofday(&tv, 0);
                  kevent(kq, NULL, 0, &kev, 1, &ts);
                  gettimeofday(&tv0, 0);
                  timersub(&tv0, &tv, &tv);

                  if (tv.tv_sec * 1000000 + tv.tv_usec < 900000) return 1;"

. auto/feature


# sendfile()

ngx_feature="sendfile()"
ngx_feature_name="NGX_HAVE_SENDFILE"
ngx_feature_run=yes
ngx_feature_incs="#include <sys/types.h>
                  #include <sys/socket.h>
                  #include <sys/uio.h>
                  #include <sys/errno.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="int s = 0, fd = 1;
                  off_t n; off_t off = 0;
                  n = sendfile(s, fd, off, &n, NULL, 0);
                  if (n == -1 && errno == ENOSYS) return 1"
. auto/feature

if [ $ngx_found = yes ]; then
    CORE_SRCS="$CORE_SRCS $DARWIN_SENDFILE_SRCS"
fi


ngx_feature="atomic(3)"
ngx_feature_name=NGX_DARWIN_ATOMIC
ngx_feature_run=no
ngx_feature_incs="#include <libkern/OSAtomic.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="int32_t  lock = 0;
                  if (!OSAtomicCompareAndSwap32Barrier(0, 1, &lock)) return 1"
. auto/feature