Connection upgrade support in uwsgi and scgi modules.

Prodded by Roberto De Ioris.

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 c87b44b..fab3766 100644
--- a/src/http/modules/ngx_http_scgi_module.c
+++ b/src/http/modules/ngx_http_scgi_module.c
@@ -984,7 +984,7 @@
             u = r->upstream;
 
             if (u->headers_in.status_n) {
-                return NGX_OK;
+                goto done;
             }
 
             if (u->headers_in.status) {
@@ -1015,6 +1015,14 @@
                 u->state->status = u->headers_in.status_n;
             }
 
+        done:
+
+            if (u->headers_in.status_n == NGX_HTTP_SWITCHING_PROTOCOLS
+                && r->headers_in.upgrade) 
+            {
+                u->upgrade = 1;
+            }
+
             return NGX_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 c683df0..f71a4f2 100644
--- a/src/http/modules/ngx_http_uwsgi_module.c
+++ b/src/http/modules/ngx_http_uwsgi_module.c
@@ -1018,7 +1018,7 @@
             u = r->upstream;
 
             if (u->headers_in.status_n) {
-                return NGX_OK;
+                goto done;
             }
 
             if (u->headers_in.status) {
@@ -1049,6 +1049,14 @@
                 u->state->status = u->headers_in.status_n;
             }
 
+        done:
+
+            if (u->headers_in.status_n == NGX_HTTP_SWITCHING_PROTOCOLS
+                && r->headers_in.upgrade) 
+            {
+                u->upgrade = 1;
+            }
+
             return NGX_OK;
         }