Trying to use a proxy when libcurl was built with proxy support disabled
should make curl error out properly.
Remove knowledge of disabled features from the tool code and instead
make it properly respond to what libcurl returns. Update all tests to
properly require the necessary features to be present/absent so that the
test suite can still be run even with libcurl builds with disabled
features.
Ref: https://curl.se/mail/archive-2022-03/0013.htmlCloses#8565
Failures clearly returned from a (SOCKS) proxy now causes this return
code. Previously the situation was not very clear as what would be
returned and when.
In addition: when this error code is returned, an application can use
CURLINFO_PROXY_ERROR to query libcurl for the detailed error, which then
returns a value from the new 'CURLproxycode' enum.
Closes#5770
The purpose with this variable is to provide a port number that is
reasonably likely to not have a listener on the local host so that tests
can try connect failures against it. It uses port 47 - "reserved"
according to IANA.
Updated six tests to use it instead of the previous different ports.
Assisted-by: Emil Engler
Closes#5270
