merltron-pa

upstream upstream_cms_old {
  server 123.23.123.123:443;
}
 
upstream upstream_sap {
  server 44.44.44.44:443;
}

merltron-pa

split_clients "${remote_addr}${http_user_agent}" $split_upstream {
  99%  upstream_cms_old;
  * upstream_sap;
}

merltron-pa

map $cookie_migration_split $chosen_upstream {
  default $split_upstream;
  "upstream_cms_old" "upstream_cms_old";
  "upstream_sap"    "upstream_sap";
}

merltron-pa

if ($deliver_upstream = 'upstream_sap') {
   # users should stay on the new site forever
   set $cookie_lifetime '31536000'; # 60*60*24*365 = 1 year
}

merltron-pa

# overwrite the upstream by appending "?force_upstream=oldcms" to the URL
map $arg_force_upstream $deliver_upstream {
  default  $chosen_upstream;
  "oldcms" "upstream_cms_old";
  "sap"    "upstream_sap";
}

merltron-pa

add_header Set-Cookie "migration_split=$deliver_upstream;Path=/;Max-Age=$cookie_lifetime;";
proxy_pass https://$deliver_upstream;
    }

merltron-pa

map $remote_addr $bypass_ip {
  default 0;
  "1.111.111.111" 1;
}
 
map $remote_addr $bypass_ip_to_sap {
  default        0;
  "22.22.22.22"  1;
  "33.33.33.33"  1;
  "44.44.44.44"  1;

merltron-pa

map $http_user_agent $bypass_user_agent {
 default 0;
 ~*(Googlebot|bingbot|Slurp) 1;
}

merltron-pa

System.out.printf("How long is %s? Well, it's %d %n characters long of course!", "a piece of string", "a piece of string".length());
/* OUTPUT: How long is a piece of string? Well, it's 17 characters long of course! */

merltron-pa

print("How long is %s? Well, it's %s characters long of course!" % ("a piece of string", len("a piece of string")))
# OUTPUT: How long is a piece of string? Well, it's 17 characters long of course!