Upstream: handling of proxy_set_header at http level.

When headers are set at the "http" level and not redefined in
a server block, we now preserve conf->headers into the "http"
section configuration to inherit it to all servers.

The same applies to conf->headers_cache, though it may not be effective
if no servers use cache at the "server" level as conf->headers_cache
is only initialized if cache is enabled on a given level.

Similar changes made in fastcgi/scgi/uwsgi to preserve conf->params
and conf->params_cache.

src/http/modules/ngx_http_fastcgi_module.c

diff --git a/src/http/modules/ngx_http_fastcgi_module.c b/src/http/modules/ngx_http_fastcgi_module.c
index 62502b0..f6a8c60 100644
--- a/src/http/modules/ngx_http_fastcgi_module.c
+++ b/src/http/modules/ngx_http_fastcgi_module.c
@@ -3127,6 +3127,20 @@
 
 #endif
 
+    /*
+     * special handling to preserve conf->params in the "http" section
+     * to inherit it to all servers
+     */
+
+    if (prev->params.hash.buckets == NULL
+        && conf->params_source == prev->params_source)
+    {
+        prev->params = conf->params;
+#if (NGX_HTTP_CACHE)
+        prev->params_cache = conf->params_cache;
+#endif
+    }
+
     return NGX_CONF_OK;
 }
 

src/http/modules/ngx_http_proxy_module.c

diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index f7f91d6..480e974 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -3357,6 +3357,20 @@
 
 #endif
 
+    /*
+     * special handling to preserve conf->headers in the "http" section
+     * to inherit it to all servers
+     */
+
+    if (prev->headers.hash.buckets == NULL
+        && conf->headers_source == prev->headers_source)
+    {
+        prev->headers = conf->headers;
+#if (NGX_HTTP_CACHE)
+        prev->headers_cache = conf->headers_cache;
+#endif
+    }
+
     return NGX_CONF_OK;
 }
 

src/http/modules/ngx_http_scgi_module.c

diff --git a/src/http/modules/ngx_http_scgi_module.c b/src/http/modules/ngx_http_scgi_module.c
index 36656ec..1171434 100644
--- a/src/http/modules/ngx_http_scgi_module.c
+++ b/src/http/modules/ngx_http_scgi_module.c
@@ -1558,6 +1558,20 @@
 
 #endif
 
+    /*
+     * special handling to preserve conf->params in the "http" section
+     * to inherit it to all servers
+     */
+
+    if (prev->params.hash.buckets == NULL
+        && conf->params_source == prev->params_source)
+    {
+        prev->params = conf->params;
+#if (NGX_HTTP_CACHE)
+        prev->params_cache = conf->params_cache;
+#endif
+    }
+
     return NGX_CONF_OK;
 }
 

src/http/modules/ngx_http_uwsgi_module.c

diff --git a/src/http/modules/ngx_http_uwsgi_module.c b/src/http/modules/ngx_http_uwsgi_module.c
index 7f916e8..b6ae0d8 100644
--- a/src/http/modules/ngx_http_uwsgi_module.c
+++ b/src/http/modules/ngx_http_uwsgi_module.c
@@ -1820,6 +1820,20 @@
 
 #endif
 
+    /*
+     * special handling to preserve conf->params in the "http" section
+     * to inherit it to all servers
+     */
+
+    if (prev->params.hash.buckets == NULL
+        && conf->params_source == prev->params_source)
+    {
+        prev->params = conf->params;
+#if (NGX_HTTP_CACHE)
+        prev->params_cache = conf->params_cache;
+#endif
+    }
+
     return NGX_CONF_OK;
 }