[nginx] HTTP/2: prevented output of the HEADERS frame for canceled streams.

[Maxim Dounin]

details:   http://hg.nginx.org/nginx/rev/9d61ecbe979e
branches:  stable-1.10
changeset: 6760:9d61ecbe979e
user:      Valentin Bartenev <vbart at nginx.com>
date:      Tue Jul 19 20:22:44 2016 +0300
description:
HTTP/2: prevented output of the HEADERS frame for canceled streams.

It's useless to generate HEADERS if the stream has been canceled already.

diffstat:

 src/http/v2/ngx_http_v2_filter_module.c |  8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diffs (25 lines):

diff --git a/src/http/v2/ngx_http_v2_filter_module.c b/src/http/v2/ngx_http_v2_filter_module.c
--- a/src/http/v2/ngx_http_v2_filter_module.c
+++ b/src/http/v2/ngx_http_v2_filter_module.c
@@ -169,6 +169,12 @@ ngx_http_v2_header_filter(ngx_http_reque
         return NGX_OK;
     }
 
+    fc = r->connection;
+
+    if (fc->error) {
+        return NGX_ERROR;
+    }
+
     if (r->method == NGX_HTTP_HEAD) {
         r->header_only = 1;
     }
@@ -259,8 +265,6 @@ ngx_http_v2_header_filter(ngx_http_reque
         len += 1 + ngx_http_v2_literal_size("Wed, 31 Dec 1986 18:00:00 GMT");
     }
 
-    fc = r->connection;
-
     if (r->headers_out.location && r->headers_out.location->value.len) {
 
         if (r->headers_out.location->value.data[0] == '/') {