Reads the entire content of this URL as a String using UTF-8 or the specified charset.
This method is not recommended on huge files.
charset
- a character set to use.
Return a string with this URL entire content.
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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.io/java.net.-u-r-l/read-text.html