ngx_http_proxy_create_request can be more friendly to the case about

removal of the headers in rewrite handlers #1

Author: xfeep

src/http/modules/ngx_http_proxy_module.c

@@ -1383,7 +1383,7 @@ ngx_http_proxy_create_request(ngx_http_request_t *r)
                 i = 0;
             }
 
-            if (ngx_hash_find(&headers->hash, header[i].hash,
+            if (header[i].hash == 0 || ngx_hash_find(&headers->hash, header[i].hash,
                               header[i].lowcase_key, header[i].key.len))
             {
                 continue;
@@ -1519,7 +1519,7 @@ ngx_http_proxy_create_request(ngx_http_request_t *r)
                 i = 0;
             }
 
-            if (ngx_hash_find(&headers->hash, header[i].hash,
+            if (header[i].hash == 0 || ngx_hash_find(&headers->hash, header[i].hash,
                               header[i].lowcase_key, header[i].key.len))
             {
                 continue;