title: Magento2 Invalid Form Key. Please refresh the page while creating configurable product
body: <p>While creating the configuration products in magento2.2.2 I am facing the <strong>“Invalid Form Key. Please refresh the page”</strong> error. I have google regarding this error and I have found the solution to <code>increase the value of max_input_vars PHP configurable variable</code>. I have increased this value but the problem is not solved. </p>
  
  <p><strong>While creating the configurable product almost 40000 associated product is generated and now I have set the max_input_vars value to 3075000 but the problem is not solved.</strong> </p>
  
  <p>Anyone please help me to fix this issue. </p>