Best Pattern for AllowUnsafeUpdates

Question

So far, in my research I have seen that it is unwise to set AllowUnsafeUpdates on GET request operation to avoid cross site scripting. But, if it is required to allow this,

Answer 1

For AllowUnsafeUpdates, I follow this process:

if( HttpContext.Current is null )
{
  Do nothing, no need to set AllowUnsafeUpdates to true nor
  to call ValidateFormDigest() because update will be carried out
}
else // HttpContext.Current is NOT null
{
  if( SPContext.Current is null )
  {
    Need to set AllowUnsafeUpdates to true
  }
  else // SPContext.Current is NOT null
  {
    Call ValidateFormDigest()
  }
}