<form action="a.php" method="post"
enctype="multipart/form-data">
<input type="text"
name="x" value="abc" />
<input type="file"
name="y" />
</form><form action="a.php" method="post"
enctype="multipart/form-data">
<input type="text"
name="x" value="abc" />
<input type="file"
name="y" />
</form>POST /a.php HTTP/1.1
Content-Type: multipart/form-data;boundary="boundary"
--boundary
Content-Disposition: form-data; name="x"
test
--boundary
Content-Disposition: form-data; name="y"; filename="example.txt"
Content-Type: text/plain
text text
--boundary--