When using format-strings, curly brackets need to be escaped using `{{`
to avoid errors from python.
And apparently, Perl's `==` is used to compare substrings[1] which is why
the translation to `assert http_code == "304"` failed as the string
contains several headers from curl.
[1] Just check `perl <(echo 'die "alarm" if "foo\n304" == 304')`
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