Client does not properly handle non TLS setup

BUG REPORT:

Description

I'm trying to use spotify's dockerfile-maven plugin on Windows 10. And stumbled upon the issue that docker client that is used in the plugin does not properly handle non TLS setup .

How to reproduce

• Add dockerfile-maven plugin to your project pom.xml
• Add Dockerfile
• Open Docker settings, navigate to General tab, click "Expose daemon on tcp://localhost:2375 without TLS "
• Try to build your project with mvn clean package

What do you expect

A proper build done.

If I do a manual build docker build . it is processed as expected withou error.

Adding DOCKER_TLS_VERIFY=0 does not have any effect

What happened instead

An exception is thrown that client got http responce for http request (see below)

Software:

• OS - Windows 10
• docker version:

Client: Version: 18.06.1-ce API version: 1.38 Go version: go1.10.3 Git commit: e68fc7a Built: Tue Aug 21 17:21:34 2018 OS/Arch: windows/amd64 Experimental: false

Server: Engine: Version: 18.06.1-ce API version: 1.38 (minimum version 1.12) Go version: go1.10.3 Git commit: e68fc7a Built: Tue Aug 21 17:29:02 2018 OS/Arch: linux/amd64 Experimental: false

• Spotify's docker-client version: 8.14.2
• Spotify's dockerfile-maven version: 1.4.8

Full backtrace

[WARNING] An attempt failed, will retry 1 more times
org.apache.maven.plugin.MojoExecutionException: Could not build image
	at com.spotify.plugin.dockerfile.BuildMojo.buildImage(BuildMojo.java:208)
	at com.spotify.plugin.dockerfile.BuildMojo.execute(BuildMojo.java:110)
	at com.spotify.plugin.dockerfile.AbstractDockerMojo.tryExecute(AbstractDockerMojo.java:259)
	at com.spotify.plugin.dockerfile.AbstractDockerMojo.execute(AbstractDockerMojo.java:248)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
	at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
	at org.codehaus.classworlds.Launcher.main(Launcher.java:47)
Caused by: com.spotify.docker.client.exceptions.DockerException: java.util.concurrent.ExecutionException: com.spotify.docker.client.shaded.javax.ws.rs.ProcessingException: javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
	at com.spotify.docker.client.DefaultDockerClient.propagate(DefaultDockerClient.java:2828)
	at com.spotify.docker.client.DefaultDockerClient.request(DefaultDockerClient.java:2692)
	at com.spotify.docker.client.DefaultDockerClient.version(DefaultDockerClient.java:580)
	at com.spotify.docker.client.DefaultDockerClient.authRegistryHeader(DefaultDockerClient.java:2871)
	at com.spotify.docker.client.DefaultDockerClient.build(DefaultDockerClient.java:1478)
	at com.spotify.docker.client.DefaultDockerClient.build(DefaultDockerClient.java:1445)
	at com.spotify.plugin.dockerfile.BuildMojo.buildImage(BuildMojo.java:201)
	... 26 more
Caused by: java.util.concurrent.ExecutionException: com.spotify.docker.client.shaded.javax.ws.rs.ProcessingException: javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
	at jersey.repackaged.com.google.common.util.concurrent.AbstractFuture$Sync.getValue(AbstractFuture.java:299)
	at jersey.repackaged.com.google.common.util.concurrent.AbstractFuture$Sync.get(AbstractFuture.java:286)
	at jersey.repackaged.com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:116)
	at com.spotify.docker.client.DefaultDockerClient.request(DefaultDockerClient.java:2690)
	... 31 more
Caused by: com.spotify.docker.client.shaded.javax.ws.rs.ProcessingException: javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
	at com.spotify.docker.client.shaded.org.glassfish.jersey.apache.connector.ApacheConnector.apply(ApacheConnector.java:481)
	at com.spotify.docker.client.shaded.org.glassfish.jersey.apache.connector.ApacheConnector$1.run(ApacheConnector.java:491)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at jersey.repackaged.com.google.common.util.concurrent.MoreExecutors$DirectExecutorService.execute(MoreExecutors.java:299)
	at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:112)
	at jersey.repackaged.com.google.common.util.concurrent.AbstractListeningExecutorService.submit(AbstractListeningExecutorService.java:50)
	at jersey.repackaged.com.google.common.util.concurrent.AbstractListeningExecutorService.submit(AbstractListeningExecutorService.java:37)
	at com.spotify.docker.client.shaded.org.glassfish.jersey.apache.connector.ApacheConnector.apply(ApacheConnector.java:487)
	at com.spotify.docker.client.shaded.org.glassfish.jersey.client.ClientRuntime$2.run(ClientRuntime.java:178)
	at com.spotify.docker.client.shaded.org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)
	at com.spotify.docker.client.shaded.org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)
	at com.spotify.docker.client.shaded.org.glassfish.jersey.internal.Errors.process(Errors.java:315)
	at com.spotify.docker.client.shaded.org.glassfish.jersey.internal.Errors.process(Errors.java:297)
	at com.spotify.docker.client.shaded.org.glassfish.jersey.internal.Errors.process(Errors.java:267)
	at com.spotify.docker.client.shaded.org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:340)
	at com.spotify.docker.client.shaded.org.glassfish.jersey.client.ClientRuntime$3.run(ClientRuntime.java:210)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
	at sun.security.ssl.InputRecord.handleUnknownRecord(InputRecord.java:710)
	at sun.security.ssl.InputRecord.read(InputRecord.java:527)
	at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:983)
	at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1385)
	at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1413)
	at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1397)
	at com.spotify.docker.client.shaded.org.apache.http.conn.ssl.SSLConnectionSocketFactory.createLayeredSocket(SSLConnectionSocketFactory.java:394)
	at com.spotify.docker.client.shaded.org.apache.http.conn.ssl.SSLConnectionSocketFactory.connectSocket(SSLConnectionSocketFactory.java:353)
	at com.spotify.docker.client.shaded.org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:134)
	at com.spotify.docker.client.shaded.org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:353)
	at com.spotify.docker.client.shaded.org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:380)
	at com.spotify.docker.client.shaded.org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236)
	at com.spotify.docker.client.shaded.org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184)
	at com.spotify.docker.client.shaded.org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88)
	at com.spotify.docker.client.shaded.org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
	at com.spotify.docker.client.shaded.org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184)
	at com.spotify.docker.client.shaded.org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:71)
	at com.spotify.docker.client.shaded.org.glassfish.jersey.apache.connector.ApacheConnector.apply(ApacheConnector.java:435)
	... 21 more