id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	uname	nginx_version
1009	Upstream sent invalid header while reading response header from upstream	artursenk@…		"
Some background: in our solution we've got several Java microservices (Spring/Dropwizard + Jetty) behind Nginx which is used as a reverse proxy here.
Our microservices are stateless, we first log in with user/pass to our authorization service, receive a token and use that token to communicate with other microservices.

The problem occurs when we log in to authorization service and the response (with a token) is sent back to a customer - it stops on Nginx.
It has something in common with the size of a token (problem occurs when many scopes are added, with only a few it works), but increasing buffers (even a lot) didn't help.

We did a lot of checks - the communication works if we skip Nginx and call a Java service directly.
We also replaced Nginx with httpd just for a check and it also worked, however we prefer Nginx because of other features and performance reasons.

A full log line we see in Nginx logs:
2016/05/23 14:17:17 [error] 14503#0: *1 upstream sent invalid header while reading response header from upstream, client: 1.2.3.4, server: domain.com, request: ""POST /uaa/login HTTP/1.1"", upstream: ""http://127.0.0.1:9999/uaa/login"", host: ""a.b.domain.com""

I'm attaching several files:
- our Nginx configuration
- logs from curls received after calling authorization service directly and with Nginx in between

We are using AWS EC2 service with Centos 7 box xlarge of size.

I have checked a lot of configuration changes, but no luck.
This is a big problem for us, I hope somebody can point me to solution.
I'm happy to provide additional info upon a request.
"	defect	closed	major		nginx-core	1.10.x	worksforme	Upstream sent invalid header		Linux app.server 3.10.0-327.13.1.el7.x86_64 #1 SMP Thu Mar 31 16:04:38 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux	"nginx version: nginx/1.10.0
built by gcc 4.8.5 20150623 (Red Hat 4.8.5-4) (GCC) 
built with OpenSSL 1.0.1e-fips 11 Feb 2013
TLS SNI support enabled
configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --modules-path=/usr/lib64/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-http_ssl_module --with-http_realip_module --with-http_addition_module --with-http_sub_module --with-http_dav_module --with-http_flv_module --with-http_mp4_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_random_index_module --with-http_secure_link_module --with-http_stub_status_module --with-http_auth_request_module --with-http_xslt_module=dynamic --with-http_image_filter_module=dynamic --with-http_geoip_module=dynamic --with-http_perl_module=dynamic --add-dynamic-module=njs-1c50334fbea6/nginx --with-threads --with-stream --with-stream_ssl_module --with-http_slice_module --with-mail --with-mail_ssl_module --with-file-aio --with-ipv6 --add-module=/home/builder/rpmbuild/BUILD/nginx-1.10.0/nginx-x-rid-header --with-http_v2_module --with-cc-opt='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --with-ld-opt=-Wl,-E"