Proxy_set_header host

Server NGINX
1

I am having quite some trouble with something that should be pretty
straightforward.

I have an app deployed at http://localhost:9090/app/ , and need to
access it via http://subdomain.domain.com.

Thus I configured the following, which works fine:

    location / {
         proxy_pass              http://localhost:9090/app/;
     }

However now I need to access in my code the “subdomain.domain.com”
variable. I thought passing it through an HTTP header:

    location / {
         proxy_set_header   Host             $host;
         proxy_redirect false;
         proxy_pass              http://localhost:9090/app/;
     }

and I manage to get the header “Host”, but its value is
“localhost:9090”. Also tried with $proxy_host.

How can I get the value “subdomain.domain.com” in the Host HTTP header?

Thanks,

Francisco

2

Okay, I found out (after hours of banging my head).

Apparently I was doing something wrong with Host or $host, it was
redirecting to /app, quite misleading.

    location / {
            proxy_set_header   ServerName          $server_name;
            proxy_pass              http://localhost:9090/app/;
    }

I ended up using $server_name (somehow I didn’t figure out before this
is what I wanted :confused: ), also changing the header name… and it works!

Francisco

Francisco T. wrote:

I am having quite some trouble with something that should be pretty
straightforward.

I have an app deployed at http://localhost:9090/app/ , and need to
access it via http://subdomain.domain.com.

Thus I configured the following, which works fine:

    location / {
         proxy_pass              http://localhost:9090/app/;
     }

However now I need to access in my code the “subdomain.domain.com”
variable. I thought passing it through an HTTP header:

    location / {
         proxy_set_header   Host             $host;
         proxy_redirect false;
         proxy_pass              http://localhost:9090/app/;
     }

and I manage to get the header “Host”, but its value is
“localhost:9090”. Also tried with $proxy_host.

How can I get the value “subdomain.domain.com” in the Host HTTP header?

Thanks,

Francisco

3

On Wed, Dec 02, 2009 at 08:28:58PM +0100, Francisco T. wrote:

I ended up using $server_name (somehow I didn’t figure out before this
is what I wanted :confused: ), also changing the header name… and it works!

There is no “ServerName” header. Probably, you need just

    location / {
         proxy_pass              http://localhost:9090/app/;
    }

         proxy_pass              http://localhost:9090/app/;

Posted via http://www.ruby-forum.com/.

nginx mailing list
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nginx Info Page

–
Igor S.
http://sysoev.ru/en/

4

On Tue, Dec 29, 2009 at 4:27 AM, Francisco T. [email protected]
wrote:

to obtain the server name as a header.
Posted via http://www.ruby-forum.com/.

nginx mailing list
[email protected]
nginx Info Page

$http_host and $server_name variables are available for use and you
can pass whatever you want to backend. Please see documents at
Module ngx_http_proxy_module .

– Merlin

5

Igor S. wrote:

There is no “ServerName” header. Probably, you need just

    location / {
         proxy_pass              http://localhost:9090/app/;
    }

This is the first thing I tried. Now I updated nginx to 0.7.x and
$server_name trick doesn’t work anymore. It is still unclear to me how
to obtain the server name as a header.

Btw, it doesn’t have to be an “official” HTTP header… anything will do
as long as I can obtain the “subdomain.domain.com” in my code.

Could you please show me how?

Thanks!

Francisco