title: Which separator should be used in the Content-Type header for a multipart data request? Comma or Semicolon?
body: <p>Should the <code>Content-Type</code> header in a REST API web request be formatted with a comma as in <a href="https://www.ietf.org/rfc/rfc1867.txt" rel="nofollow noreferrer">RFC 1867</a>:</p>
  <pre><code>Content-type: multipart/form-data, boundary=AaB03x
  </code></pre>
  <p>Or with a semicolon, as in <a href="https://www.rfc-editor.org/rfc/rfc1049" rel="nofollow noreferrer">RFC 1049</a> and <a href="https://www.rfc-editor.org/rfc/rfc2045#section-5.1" rel="nofollow noreferrer">RFC 2045</a>:</p>
  <pre><code>Content-Type: multipart/mixed; boundary=gc0p4Jq0M2Yt08j34c0p
  </code></pre>