According to the specification (RFC1738) the character '_' is not allowed in URLs:
Fully qualified domain names take the form as described in Section 3.5 of RFC 1034  and Section 2.1 of RFC 1123
: a sequence of domain labels separated by ".", each domain label starting and ending with an alphanumerical character and possibly also containing "-" characters. The rightmost domain label will never start with a digit, though, which syntactically distinguishes all domain names from the IP addresses.
You can replace the '_' by '-'.
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