nginx reverse-proxy docker applications - docker

Question

I am trying to set up nginx as proxy with the following functionality:
If www.mydomain.com is called, hand out static content.
If www.mydomain.com/wekan is called, redirect to my Wekan-Dokan container.
For keeping it simple, everything is on localhost and no network required.
This is my nginx configuration:
user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;
events {
worker_connections 768;
# multi_accept on;
}
http {
server{
location / {
proxy_pass http://localhost:9050;
}
location /wekan {
proxy_pass http://localhost:3001;
}
location /pics {
proxy_pass http://localhost/example.jpg;
}
location ~ \.(gif|jpg|png)$ {
root /home/myUser/serverTest/data/images;
}
}
server{
listen 9050;
root /home/myUser/serverTest/data/up1;
location / {
}
}
}
And here is my docker-compose for the Wekan App:
version: '2'
services:
wekandb:
image: mongo:3.2.21
container_name: wekan-db
restart: always
command: mongod --smallfiles --oplogSize 128
networks:
- wekan-tier
expose:
- 27017
volumes:
- /home/myUser/wekan/wekan-db:/data/db
- /home/myUser/wekan/wekan-db-dump:/dump
wekan:
image: quay.io/wekan/wekan
container_name: wekan-app
restart: always
networks:
- wekan-tier
ports:
# Docker outsideport:insideport
- 3001:8080
environment:
- MONGO_URL=mongodb://wekandb:27017/wekan
- ROOT_URL=http://localhost
So as my basic understanding of nginx,
calling localhost:3001 and calling localhost/wekan should be the same, since localhost/wekan gets redirected to localhost:3001.
This is not the case (it gets redirected to a wekan "page not found" version)