proxy to leader didn't work with https

[lusche]

we have a 3 node chronos (3.0.2) setup

Java:
java version "1.8.0_161" Java(TM) SE Runtime Environment (build 1.8.0_161-b12) Java HotSpot(TM) 64-Bit Server VM (build 25.161-b12, mixed mode)

cmd line parameter:
--master zk://127.0.0.1:20060/mesos --zk_hosts 127.0.0.1:20060 --zk_path /chronos/shop --hostname host1 --cluster_name dev --mesos_role dev --https_port 20480 --disable_http

with this config i found that the zookeeper entry looks like:
host1:8080 cZxid = 0x1b00000f9c ctime = Mon Oct 29 13:02:40 CET 2018 mZxid = 0x1b00000f9c mtime = Mon Oct 29 13:02:40 CET 2018 pZxid = 0x1b00000f9c cversion = 0 dataVersion = 0 aclVersion = 0 ephemeralOwner = 0x2000004fbee0015 dataLength = 41 numChildren = 0

If i try to access the ui on an not leader instance i get the following exception:
`
HTTP ERROR: 500
Problem accessing /. Reason:

Error proxying request to leader (maybe the leadership just changed?)

Error:
java.net.SocketException: Unexpected end of file from server
at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:851)
at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:678)
at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:848)
at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:678)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1587)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1492)
at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
at org.apache.mesos.chronos.scheduler.api.RedirectFilter.doFilter(RedirectFilter.scala:78)
at com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:163)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:58)
at org.apache.mesos.chronos.scheduler.api.CorsFilter.doFilter(CorsFilter.scala:17)
at com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:163)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:58)
at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:118)
at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:113)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1668)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:581)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1158)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:511)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1090)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:119)
at com.codahale.metrics.jetty9.InstrumentedHandler.handle(InstrumentedHandler.java:240)
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:109)
at org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:437)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:119)
at org.eclipse.jetty.server.Server.handle(Server.java:517)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:308)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:242)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:261)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)
at org.eclipse.jetty.io.ssl.SslConnection.onFillable(SslConnection.java:192)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:261)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)
at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:75)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceAndRun(ExecuteProduceConsume.java:213)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:147)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:654)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:572)
at java.lang.Thread.run(Thread.java:748)
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`

That's because the proxy try to connect to the master via http on port 8080

If we use the cmd line parameter: --http_port 20480 the zookeeper entry looks better. I can find the right port in there. But the proxy still try to use http and didn't like the https answer from the server.