methods add_cookie, delete_all_cookies, get_cookies don't work

## 💬 Questions and Help

Hello. I deployed for testing nexus 7.1.1 for application testing. Everything works great, but i have some problem while using methods add_cookie, delete_all_cookies, get_cookies. This doesn't work


# docker-compose
`services:
selenium_hub:
image: selenium/hub:3.14.0-curium
ports:
- "4444:4444"
real_device:
image: appium/appium
depends_on:
- selenium_hub
network_mode: "service:selenium_hub"
privileged: true
volumes:
- /dev/bus/usb:/dev/bus/usb
- ~/.android:/root/.android
- $PWD/apk:/root/tmp/apk
environment:
- CONNECT_TO_GRID=true
- SELENIUM_HOST=selenium_hub
- RELAXED_SECURITY=true

nexus_7.1.1:
image: budtmo/docker-android-x86-7.1.1
privileged: true
scale: 1
depends_on:
- selenium_hub
- real_device
ports:
- "6080"
volumes:
- $PWD/apk:/root/tmp/apk
- ./video:/tmp/video
environment:
- DEVICE=Nexus 5
- CONNECT_TO_GRID=true
- APPIUM=true
- SELENIUM_HOST=selenium_hub
- AUTO_RECORD=false
- DATAPARTITION=1024m
`