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Another option is to avoid using a self-signed SSL certificate. Instead, create a real, issued SSL certificate using something like Let's Encrypt (or similar free services)
My REST API is running under HTTPS, but some of its "link" URLs are switching to HTTP
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This scenario may occur when you are running the REST API behind an HTTP proxy (e.g. Apache HTTPD's mod_proxy_http, Ngnix's proxy_pass or any other proxy that is forwarding from HTTPS to HTTP).
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