Remote control: listen also in HTTPS

[Don-vip]

From ​https://lists.openstreetmap.org/pipermail/talk/2014-February/069028.html:

it works by loading a localhost URL in a hidden frame but that is active content so will be blocked by modern browsers if loading http from https. So unless JOSM were to accept https connections to the remote control there isn't much we can do.

It's right, I have this error message from Chrome:

[blocked] The page at 'https://www.openstreetmap.org/#map=19/44.00013/12.58910' was loaded over HTTPS,
but ran insecure content from 'http://127.0.0.1:8111/load_and_zoom?left=12.586&top=44.001&right=12.591&bottom=43.999':
this content should also be loaded over HTTPS.

[stoecker]

Hmm, what cert do we want to provide?

[stoecker]

Under Linux we could try to generate a local one when openssl is installed.

[Don-vip]

It would be better to ship one. We could also generate it from Java but I fear it requires a JDK, not only a JRE.

[Don-vip]

There's also the option of ​http://docs.oracle.com/javase/6/docs/jre/api/net/httpserver/spec/com/sun/net/httpserver/HttpsServer.html

I don't know if this class is available in icedtea ?

[Don-vip]

In 6941/josm:

fix #9720 - Remote control: listen also in HTTPS