# unzipped from testcontainers-1.21.4.jar
$ javap -v -p org/testcontainers/dockerclient/DockerClientProviderStrategy.class
   ...
   #773 = Utf8               Fallback to Docker API version 1.32.
   #774 = String             #773         // Fallback to Docker API version 1.32.
   #775 = Utf8               VERSION_1_32
   #777 = Fieldref           org/testcontainers/shaded/com/github/dockerjava/core/RemoteApiVersion.VERSION_1_32:...
   ...
       273: ldc_w         #774                // String Fallback to Docker API version 1.32.
       286: getstatic     #777                // Field ...RemoteApiVersion.VERSION_1_32:...

# unzipped from testcontainers-2.0.5.jar instead
$ javap -v -p org/testcontainers/dockerclient/DockerClientProviderStrategy.class
   ...
   #742 = Utf8               VERSION_1_44
   #744 = Fieldref           org/testcontainers/shaded/com/github/dockerjava/core/RemoteApiVersion.VERSION_1_44:...
   #764 = Utf8               Pinging Docker API version 1.44.
   #765 = String             #764         // Pinging Docker API version 1.44.
   ...
       208: getstatic     #744                // Field ...RemoteApiVersion.VERSION_1_44:...
       244: ldc_w         #765                // String Pinging Docker API version 1.44.

# The hardcoded default Docker Engine API version this client falls back to moved from 1.32 to
# 1.44 somewhere between 1.21.4 and 2.0.5. The release notes for 2.0.2 say exactly that:
# "Set default docker API version to 1.44 (#11216) @eddumelendez" -
# https://github.com/testcontainers/testcontainers-java/releases/tag/2.0.2
#
# This is not a cosmetic bump. Docker Engine 29 (shipped inside Docker Desktop 4.52) raises its
# own *minimum accepted* client API version to 1.44, and rejects anything older outright:
#   "client version 1.32 is too old. Minimum supported API version is 1.44, please upgrade
#   your client to a newer version."
# reported against Testcontainers 1.21.3 in
# https://github.com/testcontainers/testcontainers-java/issues/11235 - closed as a duplicate,
# with multiple commenters confirming Testcontainers 2.0.2 works against the same Docker Desktop
# version where 1.21.x fails outright. A project pinned to the 1.x line has three options: set
# api.version=1.44 by hand in a ~/.docker-java.properties file, keep Docker Engine below 29, or move
# to 2.0.2+, where this is just the default.