security - What happens when a server without SSL makes an HTTPS request to a server that does? -

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in these instances, happens? communication fall http? i'm assuming communication either fail, or fallback, depending on setup of ssl-enabled destination server.

example case:

a plugin installed on server (which may or may not have ssl), communicates api functions on https on server b.

i think question not clear enough. mean, "a server without ssl", that

  • the server system has no kind of ssl software installed. in case of course no ssl requests can done server.
  • or web server available http , not https, there script on needs access other hosts https. in case can these requests if required software installed on server , if target host available https , if no firewalls blocks connections etc. configuration of web server has nothing kind of requests programs on web server can do.

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