Spring Not Allowing File Upload (Application-Octet Not Supported)

Question

I'm trying to upload pdfs to MinIO using Kotlin Spring. I've written a controller to upload pdfs:

@PostMapping(consumes = [MediaType.MULTIPART_FORM_DATA_VALUE, MediaType.APPLICATION_OCTET_STREAM_VALUE])
    fun createPaper(
        @RequestPart("metadata") paperRequest: PaperRequest,
        @RequestPart("pdf") pdfFile: MultipartFile
    ): ResponseEntity<Paper>

I'm making the following curl request:

$ curl -X POST http://localhost:8082/api/v1/papers -F "metadata={\"title\":\"Example Research Paper\",\"authors\":[\"Jane Smith\",\"John Doe\"],\"ab
stract\":\"This is a test paper abstract\",\"doi\":\"10.1234/test.123\",\"venue\":\"Test Conference 2024\",\"keywords\":[\"testing\",\"research\"]}" -F "[email protected];type=application/pdf" -H "Content-Type: multipart/form-data"

However, I keep getting this response:

{"timestamp":"2025-01-07T09:14:36.910+00:00","status":415,"error":"Unsupported Media Type","path":"/api/v1/papers"}

and here's what the spring logs say:

DefaultHandlerExceptionResolver : Resolved [org.springframework.web.HttpMediaTypeNotSupportedException: Content-Type 'application/octet-stream' is not supported]

Why won't it allow me to upload files?
Things I've tried:

added MediaType.APPLICATION_OCTET_STREAM_VALUE to the consumes in the controller
added this to the applicatiom.yaml mvc: content-negotiation: media-types: octet-stream: application/octet-stream servlet: multipart: enabled: true max-file-size: 120MB max-request-size: 120MB
Tried making the request from Postman, via HTML, and cURL. Any help is appreciated!

Remove the consumes element from the @PostMapping, then try again. — M. Deinum
– M. Deinum, Commented Jan 7 at 12:38
Try my answer. If it helps, I would suggest to add tags: curl and multipartform-data — Geba
– Geba, Commented Jan 19 at 16:47

Geba · Accepted Answer · 2025-02-07 10:24:43Z

1

The problem is not in the your code, the problem is in the curl.
Add the Content-Type of application/json to metadata field

-F "metadata={\"key\": \"value\"};type=application/json"

Your fixed curl:

curl -X POST http://localhost:8082/api/v1/papers \
-F "metadata={\"title\":\"Example Research Paper\",\"authors\":[\"Jane Smith\",\"John Doe\"],\"ab
stract\":\"This is a test paper abstract\",\"doi\":\"10.1234/test.123\",\"venue\":\"Test Conference 2024\",\"keywords\":[\"testing\",\"research\"]};type=application/json" \
-F "[email protected];type=application/pdf"

Also everything should work even without:

consumes in @PostMapping
-H "Content-Type: multipart/form-data"
the configs you have added to application.yaml

edited Feb 7 at 10:24

answered Jan 18 at 13:44

Geba

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