Docker

Docker received a malformed HTTP response from a registry

Error response from daemon: Get http://registry.example:5000/v2/: malformed HTTP response

Docker attempted to talk to a registry over plain HTTP while the registry expected HTTPS, producing a malformed HTTP response during the connection handshake.

malformed HTTP responseregistry

Observed message

Error response from daemon: Get http://registry.example:5000/v2/: malformed HTTP response

Also seen as

server gave HTTP response to HTTPS client
Get https://registry.example:5000/v2/: malformed HTTP response

Why it happens

Docker is using HTTP for a registry endpoint that expects HTTPS.
Registry certificates are not configured correctly on the Docker host or Docker Desktop.
The registry host is configured inconsistently between secure and insecure settings.

How to fix it

Verify whether the registry is supposed to use HTTPS and align Docker's registry configuration accordingly.
Install or correct the CA and client certificate files used for the registry.
Restart Docker Desktop or the Docker daemon after updating certificate or registry settings.

Official reference

Docker Docs: Certificates not set up correctly

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