npm reverse proxy with cache by Nginx

npm-reverse-proxy-with-cache.conf

#
# Default server configuration
#

proxy_cache_path /var/cache/nginx/bb-npm-tarball levels=1:2 keys_zone=bb_npm_cache:100m max_size=10g
                 inactive=1000d use_temp_path=off;

log_format format-npm-proxy '$remote_addr|$upstream_cache_status|$status|$http_user_agent|'
  'curl -X $request_method \'http://localhost:8899$request_uri\' '
  '-H "pacote-req-type: $http_pacote_req_type" '
  '-H "pacote-pkg-id: $http_pacote_pkg_id" '
  '-H "accept: $http_accept" '
  '-H "accept-encoding: $http_accept_encoding" '
  '-H "npm-in-ci: $http_npm_in_ci" '
  '-H "npm-session: $http_npm_session" '
  '-H "npm-scope: $http_npm_scope" '
  '-H "referer: $http_referer" '
  '-H "user-agent: npm/5.3.0 node/v8.11.0 darwin x64" '
  '-o /dev/null'
;

server {
  resolver 10.75.106.4 10.102.3.40 10.75.106.10 1.1.1.1;
  listen 8899;

  root /var/www/html;
  access_log /var/log/nginx/npm-proxy.log format-npm-proxy;

  location ~ /repository/bb-npm/.*\.tgz$ {
    proxy_cache bb_npm_cache;
    proxy_cache_key tarball-$request_uri;
 
    proxy_pass http://npm.bbpd.io$request_uri;
    proxy_set_header Host "npm.bbpd.io";

    proxy_pass_header user-agent;
    proxy_pass_header pacote-req-type;
    proxy_pass_header pacote-pkg-id;
    proxy_pass_header accept;
    proxy_pass_header accept-encoding;
    proxy_pass_header npm-in-ci;
    proxy_pass_header npm-session;
    proxy_pass_header npm-scope;
    proxy_pass_header referer;

    proxy_buffers 256 4k;
    proxy_max_temp_file_size 0;
    proxy_connect_timeout 30;
    proxy_cache_valid 200 240h;

    add_header X-Cache-Status "$upstream_cache_status 240h tarball-$request_uri$http_user_agent";
    
  }

  location /repository/bb-npm/ {

    proxy_cache bb_npm_cache;
    proxy_cache_key packcument-$request_uri;

    proxy_pass http://npm.bbpd.io$request_uri;
    proxy_set_header Host "npm.bbpd.io";

    # critical for sub_filter
    proxy_set_header Accept-Encoding "identity;q=1";

    proxy_pass_header user-agent;
    proxy_pass_header pacote-req-type;
    proxy_pass_header pacote-pkg-id;
    proxy_pass_header accept;
    proxy_pass_header accept-encoding;
    proxy_pass_header npm-in-ci;
    proxy_pass_header npm-session;
    proxy_pass_header npm-scope;
    proxy_pass_header referer;

    proxy_buffers 256 4k;
    proxy_max_temp_file_size 0;
    proxy_connect_timeout 30;
    proxy_cache_valid 200 2h;

    add_header X-Cache-Status "$upstream_cache_status 2h packcument-$request_uri$http_user_agent";

    # rewrite hostname in response
    sub_filter 'http://npm.bbpd.io/' 'http://learnshanghai-pd.int.bbpd.io:8899/';
    sub_filter_once off;
    sub_filter_types application/json;
  }

  location / {
    try_files /npm-proxy.html =404;
  }
}