title: How to catch Mixed Content error?
body: <p>I have a chrome Extension which parse web pages, and when I start to parse the <strong>"http"</strong> page which has <strong>"https"</strong> in links on this page I have a mixed content errors. Or if I scan <strong>"https"</strong> page which contains <strong>"http"</strong> links, I have the same problem.
  Previous I've fixed this issue by redirecting from <strong>HTTPS</strong> to <strong>HTTP</strong>, but know the website which I crawle use both of <strong>http</strong> and <strong>https</strong> URLs, and some pages can't redirect to HTTP.
  I've searched about 3 days how to solve this, but didn't find anything which will solve my problem.</p>