Check a value for an HTTP header (headerValueProblem: not blank, no control characters but tab, nothing above U+00FF) and return it, or throw GovDataValidationError Invalid <name>: ….
Invalid <name>: …
Check a value for an HTTP header (headerValueProblem: not blank, no control characters but tab, nothing above U+00FF) and return it, or throw GovDataValidationError
Invalid <name>: ….