id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	uname	nginx_version
2209	HTTP version 01.1 and 1.01 accepted	asta12@…		"Nginx accepts requests with the following versions

{{{
00000000000000001.1
1.00000000000000001
}}}


**How to reproduce**

Start nginx with the following config

{{{
events {}

http {
    server {
        location / {
            proxy_pass http://localhost:7000/;
        }
    }
}
}}}

Start listening on port 7000 using the following command

{{{
nc -lvnp 7000
}}}

Send the following request to nginx

{{{
GET / HTTP/00000000000001.1
Host: example.com
Connection: close

}}}

This can be done using the following command

{{{
echo -ne ""GET / HTTP/00000000000001.1\r\nConnection: close\r\nHost: example.com\r\n\r\n"" | nc localhost 80
}}}

We see that nginx forwards the following to port 7000

{{{
GET / HTTP/1.0
Host: localhost:7000
Connection: close

}}}

**Additional information**

The following ABNF describes the syntax for the HTTP version in a request where DIGIT is a decimal from 0-9.

{{{
HTTP-version  = HTTP-name ""/"" DIGIT ""."" DIGIT
HTTP-name     = %x48.54.54.50 ; ""HTTP"", case-sensitive
}}}

You can see that only one DIGIT is allowed before and one after the "".""

You can read more about it here: https://datatracker.ietf.org/doc/html/rfc7230#section-2.6 

"	defect	closed	minor		nginx-core	1.19.x	wontfix		asta12@…	Linux asta 5.8.0-1032-gcp #34~20.04.1-Ubuntu SMP Wed May 19 18:19:35 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux	"nginx version: nginx/1.18.0 (Ubuntu)
built with OpenSSL 1.1.1f  31 Mar 2020
TLS SNI support enabled
configure arguments: --with-cc-opt='-g -O2 -fdebug-prefix-map=/build/nginx-KTLRnK/nginx-1.18.0=. -fstack-protector-strong -Wformat -Werror=format-security -fPIC -Wdate-time -D_FORTIFY_SOURCE=2' --with-ld-opt='-Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now -fPIC' --prefix=/usr/share/nginx --conf-path=/etc/nginx/nginx.conf --http-log-path=/var/log/nginx/access.log --error-log-path=/var/log/nginx/error.log --lock-path=/var/lock/nginx.lock --pid-path=/run/nginx.pid --modules-path=/usr/lib/nginx/modules --http-client-body-temp-path=/var/lib/nginx/body --http-fastcgi-temp-path=/var/lib/nginx/fastcgi --http-proxy-temp-path=/var/lib/nginx/proxy --http-scgi-temp-path=/var/lib/nginx/scgi --http-uwsgi-temp-path=/var/lib/nginx/uwsgi --with-debug --with-compat --with-pcre-jit --with-http_ssl_module --with-http_stub_status_module --with-http_realip_module --with-http_auth_request_module --with-http_v2_module --with-http_dav_module --with-http_slice_module --with-threads --with-http_addition_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_image_filter_module=dynamic --with-http_sub_module --with-http_xslt_module=dynamic --with-stream=dynamic --with-stream_ssl_module --with-mail=dynamic --with-mail_ssl_module"