id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	uname	nginx_version
2078	Hop-specific HTTP headers (e.g. Upgrade) from origin server being forwarded by proxy module	hsivonen@…		"I had set up proxying with
        proxy_pass https://redacted.example:443;
        proxy_ssl_trusted_certificate /etc/nginx/redacted.crt;
        proxy_ssl_verify on;
        proxy_set_header Host $host;
        proxy_buffering off;
        proxy_http_version 1.1;

The origin server runs Apache/2.4.41 as bundled with Ubuntu 20.04.

With this setup, Safari refuses to load pages proxied by nginx from the Apache origin server https://bugs.webkit.org/show_bug.cgi?id=218560 even though requests served directly by nginx or proxied from Jetty work OK.

The problem is solved by adding 
        proxy_hide_header Upgrade;

Since Upgrade is a per-hop HTTP header, nginx should, by default, not forward it. (It seems that sending the header is an Apache bug.)

See also https://github.com/httpwg/http2-spec/issues/789"	defect	closed	minor		nginx-module	1.19.x	duplicate		hsivonen@…	Linux nginx 4.4.0-193-lowlatency #224-Ubuntu SMP PREEMPT Tue Oct 6 18:25:21 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux	"nginx version: nginx/1.19.4
built by gcc 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.12) 
built with OpenSSL 1.0.2g  1 Mar 2016
TLS SNI support enabled
configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --modules-path=/usr/lib/nginx/modules --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp --http-scgi-temp-path=/var/cache/nginx/scgi_temp --user=nginx --group=nginx --with-compat --with-file-aio --with-threads --with-http_addition_module --with-http_auth_request_module --with-http_dav_module --with-http_flv_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_mp4_module --with-http_random_index_module --with-http_realip_module --with-http_secure_link_module --with-http_slice_module --with-http_ssl_module --with-http_stub_status_module --with-http_sub_module --with-http_v2_module --with-mail --with-mail_ssl_module --with-stream --with-stream_realip_module --with-stream_ssl_module --with-stream_ssl_preread_module --with-cc-opt='-g -O2 -fPIE -fstack-protector-strong -Wformat -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fPIC' --with-ld-opt='-Wl,-Bsymbolic-functions -fPIE -pie -Wl,-z,relro -Wl,-z,now -Wl,--as-needed -pie'"