Directives srcache_store_pass_header didn't work

HI,
I use srcache-nginx with memcached. i read your "README.markdown" then i know by defult command "srcache_store PUT /memc $key" can't store if http header have "Connection:keepalive" . so i add command "srcache_store_pass_header" to force store, but it isn't work.

My nginx.conf:
location = /memc {
internal;
set $memc_key $query_string;
set $memc_exptime 600;
memc_pass 127.0.0.1:11211;
}

location / {
set $my_key $request_uri;
srcache_fetch GET /memc $my_key;
srcache_store PUT /memc $my_key;
srcache_methods GET HEAD POST;

srcache_store_pass_header Connection;
srcache_store_pass_header Set-Cookie;
srcache_store_pass_header Keep-Alive;
srcache_store_pass_header Proxy-Authenticate;
srcache_store_pass_header Proxy-Authorization;
srcache_store_pass_header TE;
srcache_store_pass_header Trailers;
srcache_store_pass_header Transfer-Encoding;
srcache_store_pass_header Upgrade;

add_header X-Cached $srcache_fetch_status;
proxy_pass http://web_servers;

}

Test Result( I already exec twice ):
[root@test ~]#curl -I http://192.168.0.214/a.html
HTTP/1.1 200 OK
Server: Nginx/1.8.1
Date: Tue, 03 Jul 2018 02:35:10 GMT
Content-Type: text/html; charset=UTF-8
Content-Length: 42
Connection: keep-alive
Last-Modified: Wed, 27 Jun 2018 07:08:38 GMT
ETag: "2a-56f9a48ab6919"
Accept-Ranges: bytes
X-Cached: MISS

Memcached Result:
[root@test ~]#telnet 127.0.0.1 11211
get /a.html
END

Can you help me to fix this problem?

Start with README.markdown and the srcache_store_pass_header behavior described in the issue, then reproduce the configuration using curl and inspect the memcached result with telnet. Trace why the shown headers do not allow storage; done means the second request is served from cache and the expected entry is present in memcached.