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Luatex 0.80 is compatible with pdflatex so uses the same back end files for most driver-specific functions. As your log shows: (/usr/local/texlive/2015/texmf-dist/tex/latex/hyperref/hpdftex.def The pdftex hyperef file is used. To avoid the warning simply do not use the package, it is not needed, and does nothing very useful, for pdftex or luatex. For ...

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Or – not fancy but effective – simply replace the hyphens in the URL by "\%2D". It doesn't look as nice as hyphens but this way it breaks correctly and still works fine as a link.

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You could use the package hyperref to perform this task. Is that what you are looking for? \documentclass[11pt]{article} \usepackage{hyperref} \begin{document} \href{www.iitkgp.ac.in}{IIT Kharagpur} \end{document} Source

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URL line breaking in bibliographies is notoriously hard and you will find many questions on this site about it. In your case the ad hoc \apptocmd{\biburlsetup}{\def\UrlBigBreaks{\do\:\do\-\do\/}}% does the trick, the standard is \def\UrlBigBreaks{\do\:\do\-}%, we just added the / character. The url package documentation says (p. 4) The result is ...

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