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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 4089b3d2cb59
children 046c951e393a 336084ff943b
line wrap: on
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# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


CORE_MODULES="ngx_core_module ngx_errlog_module ngx_conf_module"

CORE_INCS="src/core"

CORE_DEPS="src/core/nginx.h \
           src/core/ngx_config.h \
           src/core/ngx_core.h \
           src/core/ngx_log.h \
           src/core/ngx_palloc.h \
           src/core/ngx_array.h \
           src/core/ngx_list.h \
           src/core/ngx_hash.h \
           src/core/ngx_buf.h \
           src/core/ngx_queue.h \
           src/core/ngx_string.h \
           src/core/ngx_parse.h \
           src/core/ngx_parse_time.h \
           src/core/ngx_inet.h \
           src/core/ngx_file.h \
           src/core/ngx_crc.h \
           src/core/ngx_crc32.h \
           src/core/ngx_murmurhash.h \
           src/core/ngx_md5.h \
           src/core/ngx_sha1.h \
           src/core/ngx_rbtree.h \
           src/core/ngx_radix_tree.h \
           src/core/ngx_rwlock.h \
           src/core/ngx_slab.h \
           src/core/ngx_times.h \
           src/core/ngx_shmtx.h \
           src/core/ngx_connection.h \
           src/core/ngx_cycle.h \
           src/core/ngx_conf_file.h \
           src/core/ngx_module.h \
           src/core/ngx_resolver.h \
           src/core/ngx_open_file_cache.h \
           src/core/ngx_crypt.h \
           src/core/ngx_proxy_protocol.h \
           src/core/ngx_syslog.h"


CORE_SRCS="src/core/nginx.c \
           src/core/ngx_log.c \
           src/core/ngx_palloc.c \
           src/core/ngx_array.c \
           src/core/ngx_list.c \
           src/core/ngx_hash.c \
           src/core/ngx_buf.c \
           src/core/ngx_queue.c \
           src/core/ngx_output_chain.c \
           src/core/ngx_string.c \
           src/core/ngx_parse.c \
           src/core/ngx_parse_time.c \
           src/core/ngx_inet.c \
           src/core/ngx_file.c \
           src/core/ngx_crc32.c \
           src/core/ngx_murmurhash.c \
           src/core/ngx_md5.c \
           src/core/ngx_sha1.c \
           src/core/ngx_rbtree.c \
           src/core/ngx_radix_tree.c \
           src/core/ngx_slab.c \
           src/core/ngx_times.c \
           src/core/ngx_shmtx.c \
           src/core/ngx_connection.c \
           src/core/ngx_cycle.c \
           src/core/ngx_spinlock.c \
           src/core/ngx_rwlock.c \
           src/core/ngx_cpuinfo.c \
           src/core/ngx_conf_file.c \
           src/core/ngx_module.c \
           src/core/ngx_resolver.c \
           src/core/ngx_open_file_cache.c \
           src/core/ngx_crypt.c \
           src/core/ngx_proxy_protocol.c \
           src/core/ngx_syslog.c"


EVENT_MODULES="ngx_events_module ngx_event_core_module"

EVENT_INCS="src/event src/event/modules"

EVENT_DEPS="src/event/ngx_event.h \
            src/event/ngx_event_timer.h \
            src/event/ngx_event_posted.h \
            src/event/ngx_event_connect.h \
            src/event/ngx_event_pipe.h"

EVENT_SRCS="src/event/ngx_event.c \
            src/event/ngx_event_timer.c \
            src/event/ngx_event_posted.c \
            src/event/ngx_event_accept.c \
            src/event/ngx_event_udp.c \
            src/event/ngx_event_connect.c \
            src/event/ngx_event_pipe.c"


SELECT_MODULE=ngx_select_module
SELECT_SRCS=src/event/modules/ngx_select_module.c
WIN32_SELECT_SRCS=src/event/modules/ngx_win32_select_module.c

POLL_MODULE=ngx_poll_module
POLL_SRCS=src/event/modules/ngx_poll_module.c
WIN32_POLL_SRCS=src/event/modules/ngx_win32_poll_module.c

KQUEUE_MODULE=ngx_kqueue_module
KQUEUE_SRCS=src/event/modules/ngx_kqueue_module.c

DEVPOLL_MODULE=ngx_devpoll_module
DEVPOLL_SRCS=src/event/modules/ngx_devpoll_module.c

EVENTPORT_MODULE=ngx_eventport_module
EVENTPORT_SRCS=src/event/modules/ngx_eventport_module.c

EPOLL_MODULE=ngx_epoll_module
EPOLL_SRCS=src/event/modules/ngx_epoll_module.c

IOCP_MODULE=ngx_iocp_module
IOCP_SRCS=src/event/modules/ngx_iocp_module.c

FILE_AIO_SRCS="src/os/unix/ngx_file_aio_read.c"
LINUX_AIO_SRCS="src/os/unix/ngx_linux_aio_read.c"

UNIX_INCS="$CORE_INCS $EVENT_INCS src/os/unix"

UNIX_DEPS="$CORE_DEPS $EVENT_DEPS \
            src/os/unix/ngx_time.h \
            src/os/unix/ngx_errno.h \
            src/os/unix/ngx_alloc.h \
            src/os/unix/ngx_files.h \
            src/os/unix/ngx_channel.h \
            src/os/unix/ngx_shmem.h \
            src/os/unix/ngx_process.h \
            src/os/unix/ngx_setaffinity.h \
            src/os/unix/ngx_setproctitle.h \
            src/os/unix/ngx_atomic.h \
            src/os/unix/ngx_gcc_atomic_x86.h \
            src/os/unix/ngx_thread.h \
            src/os/unix/ngx_socket.h \
            src/os/unix/ngx_os.h \
            src/os/unix/ngx_user.h \
            src/os/unix/ngx_dlopen.h \
            src/os/unix/ngx_process_cycle.h"

# add to UNIX_DEPS
#            src/os/unix/ngx_gcc_atomic_amd64.h \
#            src/os/unix/ngx_gcc_atomic_sparc64.h \
#            src/os/unix/ngx_gcc_atomic_ppc.h \
#            src/os/unix/ngx_sunpro_atomic_sparc64.h \
#            src/os/unix/ngx_sunpro_x86.il \
#            src/os/unix/ngx_sunpro_amd64.il \
#            src/os/unix/ngx_sunpro_sparc64.il \


UNIX_SRCS="$CORE_SRCS $EVENT_SRCS \
            src/os/unix/ngx_time.c \
            src/os/unix/ngx_errno.c \
            src/os/unix/ngx_alloc.c \
            src/os/unix/ngx_files.c \
            src/os/unix/ngx_socket.c \
            src/os/unix/ngx_recv.c \
            src/os/unix/ngx_readv_chain.c \
            src/os/unix/ngx_udp_recv.c \
            src/os/unix/ngx_send.c \
            src/os/unix/ngx_writev_chain.c \
            src/os/unix/ngx_udp_send.c \
            src/os/unix/ngx_udp_sendmsg_chain.c \
            src/os/unix/ngx_channel.c \
            src/os/unix/ngx_shmem.c \
            src/os/unix/ngx_process.c \
            src/os/unix/ngx_daemon.c \
            src/os/unix/ngx_setaffinity.c \
            src/os/unix/ngx_setproctitle.c \
            src/os/unix/ngx_posix_init.c \
            src/os/unix/ngx_user.c \
            src/os/unix/ngx_dlopen.c \
            src/os/unix/ngx_process_cycle.c"

POSIX_DEPS=src/os/unix/ngx_posix_config.h

THREAD_POOL_MODULE=ngx_thread_pool_module
THREAD_POOL_DEPS=src/core/ngx_thread_pool.h
THREAD_POOL_SRCS="src/core/ngx_thread_pool.c
                  src/os/unix/ngx_thread_cond.c
                  src/os/unix/ngx_thread_mutex.c
                  src/os/unix/ngx_thread_id.c"

FREEBSD_DEPS="src/os/unix/ngx_freebsd_config.h src/os/unix/ngx_freebsd.h"
FREEBSD_SRCS=src/os/unix/ngx_freebsd_init.c
FREEBSD_SENDFILE_SRCS=src/os/unix/ngx_freebsd_sendfile_chain.c

LINUX_DEPS="src/os/unix/ngx_linux_config.h src/os/unix/ngx_linux.h"
LINUX_SRCS=src/os/unix/ngx_linux_init.c
LINUX_SENDFILE_SRCS=src/os/unix/ngx_linux_sendfile_chain.c


SOLARIS_DEPS="src/os/unix/ngx_solaris_config.h src/os/unix/ngx_solaris.h"
SOLARIS_SRCS=src/os/unix/ngx_solaris_init.c
SOLARIS_SENDFILEV_SRCS=src/os/unix/ngx_solaris_sendfilev_chain.c


DARWIN_DEPS="src/os/unix/ngx_darwin_config.h src/os/unix/ngx_darwin.h"
DARWIN_SRCS=src/os/unix/ngx_darwin_init.c
DARWIN_SENDFILE_SRCS=src/os/unix/ngx_darwin_sendfile_chain.c


WIN32_INCS="$CORE_INCS $EVENT_INCS src/os/win32"

WIN32_DEPS="$CORE_DEPS $EVENT_DEPS \
            src/os/win32/ngx_win32_config.h \
            src/os/win32/ngx_time.h \
            src/os/win32/ngx_errno.h \
            src/os/win32/ngx_alloc.h \
            src/os/win32/ngx_files.h \
            src/os/win32/ngx_shmem.h \
            src/os/win32/ngx_process.h \
            src/os/win32/ngx_atomic.h \
            src/os/win32/ngx_thread.h \
            src/os/win32/ngx_socket.h \
            src/os/win32/ngx_os.h \
            src/os/win32/ngx_user.h \
            src/os/win32/ngx_dlopen.h \
            src/os/win32/ngx_process_cycle.h"

WIN32_CONFIG=src/os/win32/ngx_win32_config.h

WIN32_SRCS="$CORE_SRCS $EVENT_SRCS \
            src/os/win32/ngx_errno.c \
            src/os/win32/ngx_alloc.c \
            src/os/win32/ngx_files.c \
            src/os/win32/ngx_shmem.c \
            src/os/win32/ngx_time.c \
            src/os/win32/ngx_process.c \
            src/os/win32/ngx_thread.c \
            src/os/win32/ngx_socket.c \
            src/os/win32/ngx_wsarecv.c \
            src/os/win32/ngx_wsarecv_chain.c \
            src/os/win32/ngx_udp_wsarecv.c \
            src/os/win32/ngx_wsasend.c \
            src/os/win32/ngx_wsasend_chain.c \
            src/os/win32/ngx_win32_init.c \
            src/os/win32/ngx_user.c \
            src/os/win32/ngx_dlopen.c \
            src/os/win32/ngx_event_log.c \
            src/os/win32/ngx_process_cycle.c \
            src/event/ngx_event_acceptex.c"

NGX_WIN32_ICONS="src/os/win32/nginx.ico"
NGX_WIN32_RC="src/os/win32/nginx.rc"


HTTP_FILE_CACHE_SRCS=src/http/ngx_http_file_cache.c