homebrew-cask/doc/reporting_bugs/curl_error_fix_curlrc.md

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First, lets tackle a common problem: do you have a .curlrc file? Those are a frequent cause of issues of this nature. Before anything else, remove that file and try again. If it now works, do not open an issue. Incompatible .curlrc configurations must be fixed on your side.

If, however, you do not have a .curlrc or removing it did not work, lets continue our diagnose.