diff --git a/src/http/modules/ngx_http_fastcgi_module.c b/src/http/modules/ngx_http_fastcgi_module.c
index 7b799c5..00384a1 100644
--- a/src/http/modules/ngx_http_fastcgi_module.c
+++ b/src/http/modules/ngx_http_fastcgi_module.c
@@ -887,7 +887,7 @@
     if (f == NULL) {
         f = ngx_pcalloc(r->pool, sizeof(ngx_http_fastcgi_ctx_t));
         if (f == NULL) {
-            return NGX_HTTP_INTERNAL_SERVER_ERROR;
+            return NGX_ERROR;
         }
 
         ngx_http_set_ctx(r, f, ngx_http_fastcgi_module);
@@ -1063,7 +1063,7 @@
 
                 h = ngx_list_push(&u->headers_in.headers);
                 if (h == NULL) {
-                    return NGX_HTTP_INTERNAL_SERVER_ERROR;
+                    return NGX_ERROR;
                 }
 
                 if (f->split_parts && f->split_parts->nelts) {
@@ -1077,7 +1077,7 @@
 
                     p = ngx_palloc(r->pool, size);
                     if (p == NULL) {
-                        return NGX_HTTP_INTERNAL_SERVER_ERROR;
+                        return NGX_ERROR;
                     }
 
                     buf.pos = p;
@@ -1105,7 +1105,7 @@
 
                     h->lowcase_key = ngx_palloc(r->pool, h->key.len);
                     if (h->lowcase_key == NULL) {
-                        return NGX_HTTP_INTERNAL_SERVER_ERROR;
+                        return NGX_ERROR;
                     }
 
                 } else {
@@ -1117,7 +1117,7 @@
                                              h->key.len + 1 + h->value.len + 1
                                              + h->key.len);
                     if (h->key.data == NULL) {
-                        return NGX_HTTP_INTERNAL_SERVER_ERROR;
+                        return NGX_ERROR;
                     }
 
                     h->value.data = h->key.data + h->key.len + 1;
@@ -1145,7 +1145,7 @@
                                    h->lowcase_key, h->key.len);
 
                 if (hh && hh->handler(r, h, hh->offset) != NGX_OK) {
-                    return NGX_HTTP_INTERNAL_SERVER_ERROR;
+                    return NGX_ERROR;
                 }
 
                 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
@@ -1238,7 +1238,7 @@
             f->split_parts = ngx_array_create(r->pool, 1,
                                         sizeof(ngx_http_fastcgi_split_part_t));
             if (f->split_parts == NULL) {
-                return NGX_HTTP_INTERNAL_SERVER_ERROR;
+                return NGX_ERROR;
             }
         }
 
diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index 5f8b278..24da70d 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -959,7 +959,7 @@
     ctx = ngx_http_get_module_ctx(r, ngx_http_proxy_module);
 
     if (ctx == NULL) {
-        return NGX_HTTP_INTERNAL_SERVER_ERROR;
+        return NGX_ERROR;
     }
 
     rc = ngx_http_proxy_parse_status_line(r, ctx);
@@ -994,7 +994,7 @@
     u->headers_in.status_line.data = ngx_palloc(r->pool,
                                                 u->headers_in.status_line.len);
     if (u->headers_in.status_line.data == NULL) {
-        return NGX_HTTP_INTERNAL_SERVER_ERROR;
+        return NGX_ERROR;
     }
 
     ngx_memcpy(u->headers_in.status_line.data, ctx->status_start,
@@ -1239,7 +1239,7 @@
 
             h = ngx_list_push(&r->upstream->headers_in.headers);
             if (h == NULL) {
-                return NGX_HTTP_INTERNAL_SERVER_ERROR;
+                return NGX_ERROR;
             }
 
             h->hash = r->header_hash;
@@ -1250,7 +1250,7 @@
             h->key.data = ngx_palloc(r->pool,
                                h->key.len + 1 + h->value.len + 1 + h->key.len);
             if (h->key.data == NULL) {
-                return NGX_HTTP_INTERNAL_SERVER_ERROR;
+                return NGX_ERROR;
             }
 
             h->value.data = h->key.data + h->key.len + 1;
@@ -1272,7 +1272,7 @@
                                h->lowcase_key, h->key.len);
 
             if (hh && hh->handler(r, h, hh->offset) != NGX_OK) {
-                return NGX_HTTP_INTERNAL_SERVER_ERROR;
+                return NGX_ERROR;
             }
 
             ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
@@ -1297,7 +1297,7 @@
             if (r->upstream->headers_in.server == NULL) {
                 h = ngx_list_push(&r->upstream->headers_in.headers);
                 if (h == NULL) {
-                    return NGX_HTTP_INTERNAL_SERVER_ERROR;
+                    return NGX_ERROR;
                 }
 
                 h->hash = ngx_hash(ngx_hash(ngx_hash(ngx_hash(
@@ -1313,7 +1313,7 @@
             if (r->upstream->headers_in.date == NULL) {
                 h = ngx_list_push(&r->upstream->headers_in.headers);
                 if (h == NULL) {
-                    return NGX_HTTP_INTERNAL_SERVER_ERROR;
+                    return NGX_ERROR;
                 }
 
                 h->hash = ngx_hash(ngx_hash(ngx_hash('d', 'a'), 't'), 'e');
diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index 3d72499..48158a4 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -1158,7 +1158,7 @@
         return;
     }
 
-    if (rc == NGX_ERROR || rc == NGX_HTTP_INTERNAL_SERVER_ERROR) {
+    if (rc == NGX_ERROR) {
         ngx_http_upstream_finalize_request(r, u,
                                            NGX_HTTP_INTERNAL_SERVER_ERROR);
         return;