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Curl does not work with docker

I have 2 docker containers one running an HTTP server and the other one a Redis database:

CONTAINER ID STATUS PORTS NAMES
86… Up 38 minutes 0.0.0.0:8000->8000/tcp todolist_web_1
3a… Up 38 minutes 6379/tcp todolist_redis_1

These two containers are linked together and run on docker machine :

NAME ACTIVE DRIVER STATE URL SWARM DOCKER
default * virtualbox Running tcp://192.168.99.100:2376 v18.09.9

To test my web server, from local host (which is an Ubuntu 16.04), I run the following commands:

curl -X PUT --data “new task” https://192.168.99.100:8000/todos

curl -X GET https://192.168.99.100:8000/todos

and get the following message:

curl: (28) Operation timed out after 0 milliseconds with 0 out of 0 bytes received

Could you please help me to resolve the issue?
Thank you in advance.