Nginx location match working only when matching root

I'm trying to configure nginx so I can have two locations. One for my node API and the other for my Jenkins CI.

http://my_ip/api should point to my node server and http://my_ip/jenkins should point to my jenkins CI

I have this server block.

server { listen 80; server_name my_ip_address; location /api { proxy_pass http://127.0.0.1:1234; proxy_http_version 1.1; proxy_set_header Upgrade $http_upgrade; proxy_set_header Connection 'upgrade'; proxy_set_header Host $host; proxy_cache_bypass $http_upgrade; } location /jenkins { proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto $scheme; proxy_pass http://localhost:8080; proxy_read_timeout 90; } } 

That config is not working. But if I use any of those locations matching to root it works.

This works with no problem. And the same if I use the location block of my node api with / only.

location / { proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto $scheme; proxy_pass http://localhost:8080; proxy_read_timeout 90; } 

But if I change / to /jenkins it doesn't work anymore.

I know I'm missing some basic pice of knowledge here, but I can't figure this out since everywhere I look seems to suggests that should be working ok.