Host other websites with gitlab-ce

Hi gitlab community !!

I have a problem, i try to solve it by myself with lot of tutos, google search, etc… but i didn’t find any solution.

My problem:
I want to host other website on my server, without using other port. All of my website will be reachable by using address like mywebiste.com/otherapp
My gitlab instance is reachable on gitlab.mywebsite.com without problem
I try lot of solution, installation of apache and configuration of apache and nginx over gitlab.rb, add custom block over nginx with nginx conf file.

My installation:
Gitlab-CE on Ubuntu 16.04 server host on Aliyun server.

If you have any solution or tip for me, thank you very much.

If you need other informations to help me to solve my problem, no problem.

Thanks for all