Caution while rendering html link on Visualforce PDF’s

As we all knows that rendering engine doesn’t support javascript generated elements. The following logic also will fail to redirect the user.

<apex:image url="{!$Resource.PDFImage}" onclick="window.open('www.google.com');" width="550" height="50"/>

The better approach here is the following line of code which works perfectly in this scenario.

<apex:page renderAs="pdf" >

<apex:form >

<apex:outputLink value="https://learnsfdc.blogspot.com">Click Here</apex:outputLink>

</apex:form>

</apex:page>

**Caution: Use https instead of http while referencing the link

Also as a best practice use images from static resources while rendering pdf