Content-Type header not proxied to downstream hosts

[hyperion]

Hi,

I'm new to nginx so am probably making a simple mistake but, for the life of
me, I can't see what.

I want to proxy requests with all headers that the request had to a
downstream server if it matches a regex.  I also have an issue with the
regex, but let's leave that for another post.

The nginx conf is very simple.  I know the request sent to nginx contains
the Content-Type header with value application/json from the access log:

Format:

$remote_addr - $remote_user [$time_local] "$request" $sent_http_content_type
' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent"
"$http_x_forwarded_for"'

Output:

127.0.0.1 - - [10/Dec/2014:18:34:49 -0800] "GET /event/3F0046E6B50F75A8/info
HTTP/1.1" application/json 200 532 "-" "Apache-HttpClient/4.3.5 (java 1.5)"
"-"

However, the downstream host doesn't receive it. All other headers,
including custom headers, are sent. 

My nginx config is basic, see this gist:

https://gist.github.com/mikquinlan/e68848bb4930725a6fdd

I have a workaround by manually adding the header, but I shouldn't have to
do it:

proxy_set_header Content-Type application/json;

I get the same result using nginx 1.4.4 and 1.6.2.

nginx -V output is below.

Any ideas what I'm doing wrong?

All help appreciated.

Mik


Output of nginx -V
==============
nginx version: nginx/1.6.2
built by clang 6.0 (clang-600.0.51) (based on LLVM 3.5svn)
TLS SNI support enabled
configure arguments: --prefix=/usr/local/Cellar/nginx/1.6.2
--with-http_ssl_module --with-pcre --with-ipv6
--sbin-path=/usr/local/Cellar/nginx/1.6.2/bin/nginx
--with-cc-opt='-I/usr/local/Cellar/pcre/8.35/include
-I/usr/local/Cellar/openssl/1.0.1i/include'
--with-ld-opt='-L/usr/local/Cellar/pcre/8.35/lib
-L/usr/local/Cellar/openssl/1.0.1i/lib'
--conf-path=/usr/local/etc/nginx/nginx.conf
--pid-path=/usr/local/var/run/nginx.pid
--lock-path=/usr/local/var/run/nginx.lock
--http-client-body-temp-path=/usr/local/var/run/nginx/client_body_temp
--http-proxy-temp-path=/usr/local/var/run/nginx/proxy_temp
--http-fastcgi-temp-path=/usr/local/var/run/nginx/fastcgi_temp
--http-uwsgi-temp-path=/usr/local/var/run/nginx/uwsgi_temp
--http-scgi-temp-path=/usr/local/var/run/nginx/scgi_temp
--http-log-path=/usr/local/var/log/nginx/access.log
--error-log-path=/usr/local/var/log/nginx/error.log
--with-http_gzip_static_module

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,255412,255412#msg-255412