title: Authorization header is empty on PHP var_dump()
body: <p>I'm sending a header to server with the following request headers:</p>
  
  <pre><code>Host: xx.com
  User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:50.0) Gecko/20100101 Firefox/50.0
  Accept: */*
  Accept-Language: en-US,en;q=0.5
  Accept-Encoding: gzip, deflate
  Referer: xx.com
  Authorization: Bearer mytoken1234
  X-Requested-With: XMLHttpRequest
  Connection: keep-alive
  </code></pre>
  
  <p>On my php file I'm trying to view the headers with var_dump() and it shows following:</p>
  
  <pre><code>["HTTP_ACCEPT"]=&gt;
    string(74) "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8"
   ["HTTP_ACCEPT_ENCODING"]=&gt;
    string(13) "gzip, deflate"
    ["HTTP_ACCEPT_LANGUAGE"]=&gt;
    string(23) "en-US,en;q=0.8,fi;q=0.6"
    ["HTTP_AUTHORIZATION"]=&gt;
    string(0) ""
    ["HTTP_CACHE_CONTROL"]=&gt;
    string(9) "max-age=0"
    ["HTTP_CONNECTION"]=&gt;
    string(10) "keep-alive"
    ["HTTP_COOKIE"]=&gt;
    string(71) "cpsession=scocta5%3aBcbKZGvPoUCv2Yhb%2c2dc8a5c3bd6713b6ab029f16a46980e7"
  </code></pre>
  
  <p>I tried adding following lines to my .htaccess:</p>
  
  <pre><code>   SetEnvIf Authorization "(.*)" HTTP_AUTHORIZATION=$1
  </code></pre>
  
  <p>or</p>
  
  <pre><code>   RewriteEngine On
     RewriteCond %{HTTP:Authorization} ^(.*)
     RewriteRule .* - [e=HTTP_AUTHORIZATION:%1]
  </code></pre>
  
  <p>Without these settings, Authorization header was not showing on var_dump() at all but now it's just string(0) "". Why isn't my server getting the Authorization header content?</p>