diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index 888bb3b..273c782 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -2608,6 +2608,21 @@
 }
 
 
+ngx_int_t
+ngx_http_upstream_header_variable(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data)
+{
+    if (r->upstream == NULL) {
+        v->not_found = 1;
+        return NGX_OK;
+    }
+
+    return ngx_http_variable_unknown_header(v, (ngx_str_t *) data,
+                                         &r->upstream->headers_in.headers.part,
+                                         sizeof("upstream_http_") - 1);
+}
+
+
 static char *
 ngx_http_upstream(ngx_conf_t *cf, ngx_command_t *cmd, void *dummy)
 {
diff --git a/src/http/ngx_http_upstream.h b/src/http/ngx_http_upstream.h
index aa5cc35..534400a 100644
--- a/src/http/ngx_http_upstream.h
+++ b/src/http/ngx_http_upstream.h
@@ -248,6 +248,9 @@
 };
 
 
+ngx_int_t ngx_http_upstream_header_variable(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data);
+
 void ngx_http_upstream_init(ngx_http_request_t *r);
 ngx_http_upstream_srv_conf_t *ngx_http_upstream_add(ngx_conf_t *cf,
     ngx_url_t *u, ngx_uint_t flags);
diff --git a/src/http/ngx_http_variables.c b/src/http/ngx_http_variables.c
index 5a9b06f..c3e1f60 100644
--- a/src/http/ngx_http_variables.c
+++ b/src/http/ngx_http_variables.c
@@ -23,8 +23,6 @@
     ngx_http_variable_value_t *v, uintptr_t data);
 static ngx_int_t ngx_http_variable_unknown_header_out(ngx_http_request_t *r,
     ngx_http_variable_value_t *v, uintptr_t data);
-static ngx_int_t ngx_http_variable_unknown_header(ngx_http_variable_value_t *v,
-    ngx_str_t *var, ngx_list_part_t *part, size_t prefix);
 
 static ngx_int_t ngx_http_variable_host(ngx_http_request_t *r,
     ngx_http_variable_value_t *v, uintptr_t data);
@@ -451,6 +449,17 @@
         return NULL;
     }
 
+    if (ngx_strncmp(name->data, "upstream_http_", 10) == 0) {
+
+        if (ngx_http_upstream_header_variable(r, vv, (uintptr_t) name)
+            == NGX_OK)
+        {
+            return vv;
+        }
+
+        return NULL;
+    }
+
     vv->not_found = 1;
 
     if (nowarn == 0) {
@@ -614,7 +623,7 @@
 }
 
 
-static ngx_int_t
+ngx_int_t
 ngx_http_variable_unknown_header(ngx_http_variable_value_t *v, ngx_str_t *var,
     ngx_list_part_t *part, size_t prefix)
 {
@@ -1292,6 +1301,13 @@
             continue;
         }
 
+        if (ngx_strncmp(v[i].name.data, "upstream_http_", 14) == 0) {
+            v[i].get_handler = ngx_http_upstream_header_variable;
+            v[i].data = (uintptr_t) &v[i].name;
+
+            continue;
+        }
+
         ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
                       "unknown \"%V\" variable", &v[i].name);
 
diff --git a/src/http/ngx_http_variables.h b/src/http/ngx_http_variables.h
index 8a24ffb..df487e4 100644
--- a/src/http/ngx_http_variables.h
+++ b/src/http/ngx_http_variables.h
@@ -61,6 +61,10 @@
 ngx_http_variable_value_t *ngx_http_get_variable(ngx_http_request_t *r,
     ngx_str_t *name, ngx_uint_t key, ngx_uint_t nowarn);
 
+ngx_int_t ngx_http_variable_unknown_header(ngx_http_variable_value_t *v,
+    ngx_str_t *var, ngx_list_part_t *part, size_t prefix);
+
+
 #define ngx_http_clear_variable(r, index) r->variables0[index].text.data = NULL;