Add utilities to detect and replace broken links. #1366
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Thanks alot to @christolis for helping me out on making this pull request.
Added two utulity methods
isLinkBrokenandreplaceDeadLinks-
isLinkBroken(String url) checks the link availability using a HEAD requestI used HEAD request instead of GET request to check link availability without downloading the response body, reducing bandwidth and improving the performance.
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replaceDeadLinks(String text, String replacement) replaces unreachable/broken links asynchronously.This change does not have any behavior changes to the existing code.