what does "java.net.NetPermission specifyStreamHandler" mean?

Not applicable

what does this error means:

{"fault":{"faultstring":"Execution of set-target-url failed on line 49 with error: access denied (\"java.net.NetPermission\" \"specifyStreamHandler\")","detail":{"errorcode":"steps.javascript.ScriptExecutionFailedLineNumber"}}}

i am gettin it after I try to change the target url,

also, it appears when i am sending http requests using httpClient.

but sometimes it works fine, sometimes it doesn't

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Not applicable

anything? it comes up randomly in other proxies too.. plz help