file upload failed. (API upload did not contain a file part)

Hello, I'm paul bae.

file upload frequently failed with java rest template.

not everytime. sometimes success with exactly same request(without filename).

every failed http code is "400" and message is "API upload did not contain a file part".

I don't know how to fix it.

belows are test upload fail log.

Request body: --ZCmcwgj21ZGAdw-F5nPyOHYyjoSbz64IvypjSJMc
Content-Disposition: form-data; name="attributes"
Content-Type: application/json;charset=UTF-8

{"name":"upload-test-20220806145130","parent":{"id":"164677862892"}}
--ZCmcwgj21ZGAdw-F5nPyOHYyjoSbz64IvypjSJMc
Content-Disposition: form-data; name="file"; filename="upload-test-20220806145130"
Content-Type: application/octet-stream
Content-Length: 1000

abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkl
--ZCmcwgj21ZGAdw-F5nPyOHYyjoSbz64IvypjSJMc--

Response body: {"code":"bad_request","help_url":"http://developers.box.com/docs/#errors","status":400,"message":"API upload did not contain a file part","type":"error"}

Alex Novotny

August 31, 2022 18:51

May I see the code you are running?

Is there anything else you can share on what the differences are between when it works and when it doesn't?

BAE HYUNKU （BAEHYUNKU）

September 02, 2022 04:50

I found the reason.

In header, "Content-Type: application/json;charset=UTF-8" is invalid.

invalid content type cuased intermittent server response(400)

remove invalid content type solve the problem.

cc. thx, for asking Alex.

Michael Gedigk

November 25, 2022 17:14

Bae, can you show me an example of the JSON body, i'm having the same problem

November 28, 2022 04:48

It's 3month ago test. so I dont have example.

but it's a plain file request, not complex.

and above i said, my problem is invalid header value.

AS-IS : Content-Type: application/json;charset=UTF-8

TO-BE : Content-Type: application/json;

in my case, that's all.

I hope your issue will be resovled.

November 28, 2022 18:35

---1234567890

Content-Disposition: form-data; name="attributes" Content-Type: application/json

{

"name":"test upload.txt",

"parent":{

"id":"182678998283"

}, }

Content-Disposition: form-data; name="file"; filename="test upload.txt"

Content-Type: text/plain

VGhpcyBpcyBhIHRlc3Q=

---1234567890"

Still not working.

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