Njs: Problem with auth_request_set and js_content reply

[rainerhenrichsen]

Hello, I'm trying to capture a header using auth_request_set and handling the request from a js_content. When I request /_validate manually I receive the Header normally, but when it is requested by Auth_request I cannot set $customvar.

I used as a reference the https://github.com/xeioex/njs-examples/blob/master/conf/http/complex_redirects.conf#L32, but i can't figure out what i've been doing wrong.

Nginx.conf:

js_import main from script.js;

server {

location = /_validate {
         internal;
         js_content main.GetHeader;
}

location = / {
         auth_request /_validate;
         auth_request_set $customvar $upstream_http_xcustom;

         add_header 'test' "$customvar";
         proxy_pass https://backend;
}

script.js:
function GetHeader(r) {
r.headersOut['xcustom'] = ["12345"]
r.return(200);
}

export default {GetHeader};

nginx version: nginx/1.19.10
njs: 0.5.3

[xeioex]

@rainerhenrichsen

the problem is with add_header, it adds a header to a response.

But, it seems you want to add a header for a proxied request, right?

For this, you need proxy_set_header directive.

[rainerhenrichsen]

Hi @xeioex,

add_header is for debugging purposes only, even using proxy_set_header I can't capture the xcustom header

[xeioex]

@rainerhenrichsen

$upstream_http_* is only for proxy_pass locations, replace it with $sent_http_* (as in the example)

[drsm]

@rainerhenrichsen

Hi!

It's not clear where you want to capture that header, but take a look:

function success_and_header(r) {
    r.headersOut['X-Test'] = '12345';
    r.return(200);
}

```nginx
location = /auth2 {
js_content test.success_and_header;
}

location /secure2 {
    auth_request /auth2;
    auth_request_set $check "this was sent from auth_request: $sent_http_x_test";

    add_header X-Test-Some "$check and goes to client";
    proxy_set_header X-Test-Some "$check and goes to backend";

    proxy_pass http://127.0.0.1:10000/content;
}

location /content {
    return 200 "$http_x_test_some";
}

```shell
$ curl -v localhost:10000/secure2
*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to localhost (127.0.0.1) port 10000 (#0)
> GET /secure2 HTTP/1.1
> Host: localhost:10000
> User-Agent: curl/7.58.0
> Accept: */*
> 
< HTTP/1.1 200 OK
< Server: nginx/1.19.10
< Date: Fri, 16 Apr 2021 21:11:38 GMT
< Content-Type: application/octet-stream
< Content-Length: 58
< Connection: keep-alive
< X-Test-Some: this was sent from auth_request: 12345 and goes to client
< 
* Connection #0 to host localhost left intact
this was sent from auth_request: 12345 and goes to backend

[rainerhenrichsen]

Hi @xeioex,

Tks for support, problem solved with $sent_http_*.