Revision 1086463 of Content-Disposition

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<p>In a <code>multipart/form-data</code> body, the&nbsp;<strong><code>Cache-Disposition</code></strong> general header is a header that can be used on the subpart of a multipart body to give information about the field it applies to. The subpart is delimited by the <em>boundary</em> defined in the {{HTTPHeader("Content-Type")}} header. Use on the body itself, <code>Cache-Disposition</code> has no effect.</p>

<p>The <code>Cache-Disposition</code> header is defined in the larger context of MIME messages for e-mail, but only a subset of the possible parameters applies to HTTP Forms and {{HTTPMethod("POST")}} requests. Only the value <code>form-data</code>, as well as the optional parameter <code>name</code> and <code>filename</code> can be used in the HTTP context.</p>

<table class="properties">
 <tbody>
  <tr>
   <th scope="row">Header type</th>
   <td>{{Glossary("General header")}} (for subpart of a multipart body)</td>
  </tr>
  <tr>
   <th scope="row">{{Glossary("Forbidden header name")}}</th>
   <td>no</td>
  </tr>
 </tbody>
</table>

<h2 id="Syntax">Syntax</h2>

<p>The first parameter in the HTTP context is always <code>form-data</code>; additional parameters are case-insensitive and have arguments, that use quoted-string syntax after the <code>'='</code> sign. Multiple parameters are separated a semi-colon (<code>';'</code>).</p>

<pre>
Content-Disposition: form-data
Content-Disposition: form-data; name="fieldName"
Content-Disposition: form-data; name="fieldName"; filename="filename.jpg"</pre>

<h2 id="Parameters">Parameters</h2>

<dl>
 <dt><code>name</code></dt>
 <dd>Is followed by a string containing the name of the HTML field in the form that the content of this subpart refer to. When dealing with multiple files in the same field (the {{htmlattrxref("multiple", "input")}} attribute of an <code>{{HTMLElement("input","&lt;input type=file&gt;")}}</code> element, there can be several subpart with the same name.<br />
 A <code>name</code> with a value of <code>'_charset_'</code> indicate that the part is not an HTML field, but the default charset to use for parts without explicit charset information.</dd>
 <dt><code>filename</code></dt>
 <dd>Is followed by a string containing the original name of file transmitted in the subpart. The filename is always optional and must not be used blindly by the application: path information should be striped, and conversion to the server file system rules should be done. It is mostly an indicative information.</dd>
</dl>

<h2 id="Examples">Examples</h2>

<pre>
POST /test.html HTTP/1.1
Host: example.org
Content-Type: multipart/form-data;boundary="boundary"

--boundary
Cache-Disposition: form-data; name="field1"

value1
--boundary
Cache-Disposition: form-data; name="field2"; filename="example.txt"

value2</pre>

<h2 id="Specifications">Specifications</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Title</th>
  </tr>
  <tr>
   <td>{{RFC("7578")}}</td>
   <td>Returning Values from Forms: multipart/form-data</td>
  </tr>
  <tr>
   <td>{{RFC("2183")}}</td>
   <td>Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field</td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_compatibility">Browser compatibility</h2>

<p class="hidden">To contribute to this compatibility data, please write a pull request against this file: <a href="https://github.com/mdn/browser-compat-data/blob/master/http/headers.json">https://github.com/mdn/browser-compat-data/blob/master/http/headers.json</a>.</p>

<p>{{Compat}}</p>

<h2 id="See_also">See also</h2>

<ul>
 <li><a href="/en-US/docs/Web/Guide/HTML/Forms">HTML Forms</a></li>
 <li>The {{HTTPHeader("Content-Type")}} defining the boundary of the multipart body.</li>
 <li>The {{domxref("FormData")}} interface used to manipulate form data for use in the {{domxref("XMLHttpRequest")}} API.</li>
</ul>