commit 08a73b4aadebd9405ac52ec1f6eef5ca1fe8c11a
author Maxim Dounin <mdounin@mdounin.ru> Mon Feb 18 13:50:52 2013 +0000
committer Maxim Dounin <mdounin@mdounin.ru> Mon Feb 18 13:50:52 2013 +0000
tree 844f6f53431a2c5071b7a799a697b26631946db9
parent 35c17ea6f55c202956dccdf11edcdcda432edebe

Proxy: support for connection upgrade (101 Switching Protocols).

This allows to proxy WebSockets by using configuration like this:

    location /chat/ {
        proxy_pass http://backend;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }

Connection upgrade is allowed as long as it was requested by a client
via the Upgrade request header.

src/http/modules/ngx_http_chunked_filter_module.c

diff --git a/src/http/modules/ngx_http_chunked_filter_module.c b/src/http/modules/ngx_http_chunked_filter_module.c
index 94313a8..a7dc5bf 100644
--- a/src/http/modules/ngx_http_chunked_filter_module.c
+++ b/src/http/modules/ngx_http_chunked_filter_module.c
@@ -62,6 +62,7 @@
 
     if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED
         || r->headers_out.status == NGX_HTTP_NO_CONTENT
+        || r->headers_out.status < NGX_HTTP_OK
         || r != r->main
         || (r->method & NGX_HTTP_HEAD))
     {

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 ce47a9e..a623adc 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -1474,6 +1474,14 @@
                 u->keepalive = !u->headers_in.connection_close;
             }
 
+            if (u->headers_in.status_n == NGX_HTTP_SWITCHING_PROTOCOLS) {
+                u->keepalive = 0;
+
+                if (r->headers_in.upgrade) {
+                    u->upgrade = 1;
+                }
+            }
+
             return NGX_OK;
         }