Question

POST /upload HTTP/1.1
Host: assets.drop.io
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.10) Gecko/2
009042316 Firefox/3.0.10
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Content-Length: 5728
Content-Type: multipart/form-data; boundary=--------MalolHCBdarysNYMHZbIvjbD


--------MalolHCBdarysNYMHZbIvjbD
Content-Disposition: form-data; name="api_key"

0b8a12109c3a1bfc4ba94aec926e1f9cfd8bb6f0
--------MalolHCBdarysNYMHZbIvjbD
Content-Disposition: form-data; name="drop_name"

4pgvoxc
--------MalolHCBdarysNYMHZbIvjbD
Content-Disposition: form-data; name="version"

2.0
--------MalolHCBdarysNYMHZbIvjbD
Content-Disposition: form-data; name="rachel"; filename="rachel"
Content-Type: application/octet-stream

BMv¶
--------MalolHCBdarysNYMHZbIvjbD--

The response I get is: Bad Request. And in the HTML of the response there is this:

:MultiPartParseError: bad content body:
 
----------MalolHCBdarysNYMHZbIvjbD  should ==  ----------MalolHCBdarysNYMHZbIvjbD
 ></td></tr>

Answer 1

The answer is in your question. The response says that the divider should be ----------MalolHCBdarysNYMHZbIvjbD instead of ----------MalolHCBdarysNYMHZbIvjbD

Look at the leading and trailing spaces.

Answer 2

The schematic syntax of a multipart/form-data message is as follows:

Content-Type: multipart/form-data; boundary=boundary

--boundary
Content-Disposition: form-data; name="field 1"

data 1
--boundary
Content-Disposition: form-data; name="field 2"

data 2
⋮
--boundary
Content-Disposition: form-data; name="field N"

data N
--boundary--

So the inner part boundaries are --boundary (-- followed by the boundary value) and the last is --boundary-- (-- followed by the boundary value followed by --).

In your case you are just missing the leading --.

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