This parameter controls the preference level of libcurl between using user names and passwords from your ~/.netrc file, relative to user names and passwords in the URL supplied with CURLOPT_URL.
Only machine name, user name and password are taken into account (init macros and similar things aren't supported).
libcurl does not verify that the file has the correct properties set (as the standard Unix ftp client does). It should only be readable by user.
level should be set to one of the values described below.
The use of your ~/.netrc file is optional, and information in the URL is to be preferred. The file will be scanned for the host and user name (to find the password only) or for the host only, to find the first user name and password after that machine, which ever information is not specified in the URL.
Undefined values of the option will have this effect.
The library will ignore the file and use only the information in the URL.
This is the default.
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