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• Google: http://www.google.com/addurl
• Yahoo: http://siteexplorer.search.yahoo.com/submit
• Bing: http://www.bing.com/docs/submit.aspx

Ensure your proxy is passing X-Forwarded-* headers

Some HTML tags important for SEO, such as the "citation_pdf_url" tag, require the full URL of your site.  DSpace will automatically attempt to "discover" that URL using HTTP Headers. 

Because most DSpace sites use some sort of proxy (e.g. Apache web server or Nginx or similar), this requires that the proxy be configured to pass along proper X-Forwarded-* headers, especially X-Forwarded-Host and X-Forwarded-Proto.  For example in Apache HTTPD, you can do something like this:

# This lets DSpace know it is running behind HTTPS and what hostname is currently used
# (requires installing/enabling mod_headers)
RequestHeader set X-Forwarded-Proto https
RequestHeader set X-Forwarded-Host my.dspace.edu

Ensure the user interface is using server-side rendering

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