Visualforce Render Details Tab as PDF - Opens Blank PDF

Question

I want to open case details in PDF view when clicking on custom button in Lightning. I have a custom button(added it to standard layout) with Content Source Visualforce Page.

Below is my VF Code:

<apex:page StandardController="Case" extensions="ConvertToPDF" renderAs="pdf" applyHtmlTag="true"  applyBodyTag="true" sideBar="false">
   <apex:includeLightning />
<apex:outputtext value="{!CaseURL}" escape="false" style="position: absolute;top: 0;"/>
</apex:page>

In My controller:

            String Id  = ApexPages.currentPage().getParameters().get('Id');    
            String URL = '/'+Id;
            return (new PageReference(URL).getContent().toString());

I am able to open new tab but the PDF is rendered as Blank.

Answer 1

I think applyHtmlTag="false" and applyBodyTag="false" should be there as apex:page attributes to open the page in pdf.