title: Setting content-type meta data on s3 multi part upload
body: <p>I'm trying to set the content-type meta data for the files I'm uploading using s3 api in php. My code looks like this:</p>
  
  <pre><code> $upload_model = $s3-&gt;createMultipartUpload(array("Bucket" =&gt; $bucket , "Key"=&gt; $key, "ACL"=&gt;$acl , "Metadata" =&gt; array('Content-Type' =&gt; $this -&gt; get_file_type($file_path) ) ) );
  </code></pre>
  
  <p>suppose I have "video/webm" content type, the result that I see in my s3 browser is that the "Content-Type" set to "binary/octet-stream" and s3 create a "x-amz-meta-content-type" for me with "video/wemb" value inside of it which is totally useless for my purpose. Because browsers only respond to "Content-Type" header to decide whether download the files or show them in the browser instead.</p>