Get User Session Id Using Visualforce Page

<apex:page contentType="application/json">{"sessionId":"{!$Api.Session_ID}"}</apex:page>

public class GetSessionId {
    public class SessionId {
        public string sessionId;
    }
    
    @AuraEnabled
    public static string getUserSessionId() {
         SessionId sessionJson = new SessionId();
        if(!Test.isRunningTest()){
             sessionJson = (SessionId)JSON.deserialize(Page.YourVFPage.getContent().toString(), SessionId.class);
        }
        return sessionJson.sessionId;
    }

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