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- "use LONCAPA::LWPReq" not needed because "use Apache::loncommon" is used.
- Bug 6910 - Change regexp used to check for valid external URL (assumes ascii-only DNS hostname, and either http or https). - Cache result of frameability check for 60 minutes, when rendering page containing external resource URL, unless CC is using "Preview".
- Remove trailing white space in documentation.
- Bug 6910 Gracefully handle display (and preview) for External Resources for which Content-Security-Policy or X-Frame-Options prevent display in iframe in LC.