No variables are copied to the header

Description of Issue/Question

No variables are copied when using shib_request_use_headers on;.

I've added a couple of ngx_log_debug and came to the conclusion that no headers where available to the subrequest (sr).

nginx-http-shibboleth/ngx_http_shibboleth_module.c

Lines 271 to 281 in 69829b9

    
                   if (ctx->status == NGX_HTTP_OK) { 
        
                       ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, 
        
                                  "shib request authorizer allows access"); 
        
                       if (arcf->use_headers) { 
        
                           /* 
        
                            * 200 response may include headers prefixed with `Variable-`, 
        
                            * copy these into main request headers 
        
                            */ 
        
                           part = &sr->headers_out.headers.part; 
        
                           h = part->elts;

Do you have any leads to follow?

Kindest regards!

Setup

A mix of your setup and https://github.com/jnyryan/vagrant-shibboleth-sp-nginx
https://hesso.whut.ch/ (using http2)

Steps to Reproduce Issue

...

Versions and Systems

nginx version: nginx/1.10.1
built by gcc 5.3.1 20160413 (Ubuntu 5.3.1-14ubuntu2.1) 
built with OpenSSL 1.0.2g-fips  1 Mar 2016
TLS SNI support enabled
configure arguments: --sbin-path=/usr/sbin/nginx --conf-path=/etc/nginx/nginx.conf --pid-path=/run/nginx.pid --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --with-http_ssl_module --with-ipv6 --with-http_v2_module --add-module=/opt/nginx-http-shibboleth --add-module=/opt/headers-more-nginx-module --with-debug

shibboleth 2.5.3

Could it be a missing exportAssertion?

Indeed... https://github.com/nginx-shib/nginx-http-shibboleth/blob/master/CONFIG.rst#configuring-shibboleths-shibboleth2xml-to-recognise-secured-paths

My bad, thanks for this awesome module!!

No worries, what was the config issue?

It's can be a pretty complicated setup so if the docs could be improved,
open a pull request 😃

Adding a <RequestMapper> and making the fastcgi buffer insanely huge did it. I'll see if I have something worth a PR.

	if (ctx->status == NGX_HTTP_OK) {
	ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
	"shib request authorizer allows access");

	if (arcf->use_headers) {
	/*
	* 200 response may include headers prefixed with `Variable-`,
	* copy these into main request headers
	*/
	part = &sr->headers_out.headers.part;
	h = part->elts;