If you’re not checking your client’s HTTP headers, you’re not giving them good service.
We aren’t talking about the stuff in between the <head> and </head> tags, either. We’re talking about the server response that you get before you get all that nice HTML, or that fancy PDF. Implementing important SEO items in the HTTP headers is more common than you may think, and most of the major SEO tools don’t check them. HTTP headers are so critical to our SEO efforts that we built a tool to use internally called Head Exam. It checks headers for SEO factors and lets us bulk check a list of URLs so we can audit a whole site.
Read more about Head Exam here or access the tool below.