Regexp in proxy,and placeholder in proxy from,to

[lvhuat]

Do these feature will support in future, i'am running my program in docker env, so i want to route my restful apis to my different container,i need any function like:

proxy /v1/users/(.*)/node  {1}.agent

so i may route the path /v1/user/user1001/node to dns address user1001.agent

or maybe some more powerful:

proxy /v1/users/(.*)/node  uppercase({1}).agent

[mholt]

Thanks for the feature request, but I think this is covered in #1639. (We'll finish it eventually.)