URLs have permanently moved

[Puzzled-Face]

This is a sub-issue. See also #841.

Found the following (possibly) invalid URLs:
  URL: http://CRAN.R-project.org/package=crmPack
    From: inst/doc/crmPack-jss-paper.html
    CRAN URL not in canonical form
  URL: http://ggplot2.org
    From: inst/doc/crmPack-jss-paper.html
    Status: Error
    Message: Could not resolve host: ggplot2.org
  URL: http://mcmc-jags.sourceforge.net (moved to https://mcmc-jags.sourceforge.io/)
    From: inst/doc/crmPack-jss-paper.html
    Status: 301
    Message: Moved Permanently
  URL: http://onlinelibrary.wiley.com/doi/10.1002/sim.3230 (moved to https://onlinelibrary.wiley.com/doi/10.1002/sim.3230)
    From: inst/doc/example.html
    Status: 301
    Message: Moved Permanently
  URL: http://www.berryconsultants.com/software (moved to https://www.berryconsultants.com/software/)
    From: inst/doc/crmPack-jss-paper.html
    Status: 301
    Message: Moved Permanently
  URL: http://www.cytel.com/software/east/ (moved to https://cytel.com/east-horizon/)
    From: inst/doc/crmPack-jss-paper.html
    Status: 301
    Message: Moved Permanently
  URL: http://www.iconplc.com/innovation/addplan/ (moved to https://www.iconplc.com/innovation/addplan/)
    From: inst/doc/crmPack-jss-paper.html
    Status: 301
    Message: Moved Permanently
  URL: http://www.sas.com/ (moved to https://www.sas.com/)
    From: inst/doc/crmPack-jss-paper.html
    Status: 301
    Message: Moved Permanently
  URL: http://www.stata.com/ (moved to https://www.stata.com/)
    From: inst/doc/crmPack-jss-paper.html
    Status: 301
    Message: Moved Permanently
  URL: https://cran.r-project.org/web/packages/knitr/vignettes/knit_print.html
    From: inst/doc/knit_print.html
    Status: 200
    Message: OK
    CRAN URL not in canonical form
  URL: https://www.ncbi.nlm.nih.gov/pubmed/21318084 (moved to https://pubmed.ncbi.nlm.nih.gov/21318084/)
    From: inst/doc/crmPack-jss-paper.html
    Status: 301
    Message: Moved Permanently
  URL: https://www.ncbi.nlm.nih.gov/pubmed/2790129 (moved to https://pubmed.ncbi.nlm.nih.gov/2790129/)
    From: inst/doc/crmPack-jss-paper.html
    Status: 301
    Message: Moved Permanently
  URL: https://yihui.name/knitr/ (moved to https://yihui.org/knitr/)
    From: inst/doc/crmPack-jss-paper.html
    Status: 301
    Message: Moved Permanently
The canonical URL of the CRAN page for a package is 
  https://CRAN.R-project.org/package=pkgname
Canonical CRAN.R-project.org URLs use https.
For content that is 'Moved Permanently', please change http to https,
add trailing slashes, or replace the old by the new URL.

[Puzzled-Face]

There is a problem with https://cran.r-project.org/web/packages/knitr/vignettes/knit_print.html. It appears you can't use the canonical form of the URl when linking to a vignette (or other specific location in a package). Uwe Ligges himself suggests that this is the case and that the only solution is to make a NOTE in the CRAN submission.