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URLValidator checks that a given field is a String and a valid URL
Parameters
<validators>
<!-- Plain Validator Syntax -->
<validator type="url">
<param name="fieldName">myHomePage</param>
<message>Invalid homepage url</message>
</validator>
<!-- Field Validator Syntax -->
<field name="myHomepage">
<field-validator type="url">
<message>Invalid homepage url</message>
</field-validator>
</field>
</validators>
See more details in UrlValidator Annotation