HTML forms can have file type as input field to update and send files to server. To be able to handle file upload, it need to have form attribute enctype="multipart/form-data". Here is a quick code snippet which has file upload input and posts to a dummy endpoint/url. The endpoints just dumps the information about uploaded file using php $_POST and $_FILES object.
<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script> <form id="form1" enctype="multipart/form-data" action="/api/post-dump.php" method=POST> name1: <input type="text" name="name1" value="value1" /><br/> file1: <input type="file" name="file1" /> <input type="submit" name="submit" value="submit"/> </form>
Here is how request headers look like for a form post with file upload:
