Another regression from https://github.com/bagder/curl/commit/fddb7b44a79d78e05043e1c97e069308b6b85f79

That change broke "" and ":" -- Kamil fixed ":" in https://github.com/bagder/curl/commit/abca89aaa0fb208cfaf4ead6692014c4e553388a

The previous code did this:

  separator = strchr(option, ':');
  if(separator != NULL) {
    ...
  } else {
    result = setstropt(user_storage, option);
  }

Since the fact that CURLOPT_USERPWD worked with an empty string was undocumented, feel free to reject the patch. Looks like the change that started allowing "" was https://github.com/bagder/curl/commit/08cf6780ba8ea242cb451f07e14bb572079e22cf, so it worked for ~4.5 years.

- Toby

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