Upstream: added callback hook for the "Set-Cookie" header. No functional changes.

diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index 577c2b5..a562b24 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c

@@ -110,6 +110,8 @@
     ngx_table_elt_t *h, ngx_uint_t offset);
 static ngx_int_t ngx_http_upstream_rewrite_refresh(ngx_http_request_t *r,
     ngx_table_elt_t *h, ngx_uint_t offset);
+static ngx_int_t ngx_http_upstream_rewrite_set_cookie(ngx_http_request_t *r,
+    ngx_table_elt_t *h, ngx_uint_t offset);
 static ngx_int_t ngx_http_upstream_copy_allow_ranges(ngx_http_request_t *r,
     ngx_table_elt_t *h, ngx_uint_t offset);
 
@@ -198,7 +200,7 @@
 
     { ngx_string("Set-Cookie"),
                  ngx_http_upstream_process_set_cookie, 0,
-                 ngx_http_upstream_copy_header_line, 0, 1 },
+                 ngx_http_upstream_rewrite_set_cookie, 0, 1 },
 
     { ngx_string("Content-Disposition"),
                  ngx_http_upstream_ignore_header_line, 0,
@@ -3673,6 +3675,27 @@
 
 
 static ngx_int_t
+ngx_http_upstream_rewrite_set_cookie(ngx_http_request_t *r, ngx_table_elt_t *h,
+    ngx_uint_t offset)
+{
+    ngx_table_elt_t  *ho;
+
+    ho = ngx_list_push(&r->headers_out.headers);
+    if (ho == NULL) {
+        return NGX_ERROR;
+    }
+
+    *ho = *h;
+
+    if (r->upstream->rewrite_cookie) {
+        return r->upstream->rewrite_cookie(r, ho);
+    }
+
+    return NGX_OK;
+}
+
+
+static ngx_int_t
 ngx_http_upstream_copy_allow_ranges(ngx_http_request_t *r,
     ngx_table_elt_t *h, ngx_uint_t offset)
 {

diff --git a/src/http/ngx_http_upstream.h b/src/http/ngx_http_upstream.h
index d99b904..f32c985 100644
--- a/src/http/ngx_http_upstream.h
+++ b/src/http/ngx_http_upstream.h

@@ -299,6 +299,8 @@
                                          ngx_int_t rc);
     ngx_int_t                      (*rewrite_redirect)(ngx_http_request_t *r,
                                          ngx_table_elt_t *h, size_t prefix);
+    ngx_int_t                      (*rewrite_cookie)(ngx_http_request_t *r,
+                                         ngx_table_elt_t *h);
 
     ngx_msec_t                       timeout;