Problem returning array of byte and representing form-data

I have the following piece of code,

@PostMapping(value = "/create/{userId}", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
public ResponseEntity<Object> saveFile(
        @Parameter(description = "ID of the user") @PathVariable(value = "userId") final String userId,
        @Parameter(description = "Avatar of the user", content = @Content(mediaType = MediaType.APPLICATION_OCTET_STREAM_VALUE)) @RequestParam(value = "avatar", required = true) final MultipartFile file
) {
    ...
}

@GetMapping(value = "/get", produces = MediaType.IMAGE_PNG_VALUE)
@ApiResponse(responseCode = "200", description = "OK", content = {@Content(array = @ArraySchema(schema = @Schema(implementation = Byte.class)))})
public ResponseEntity<byte[]> getFile() {
    ...
}

And below are the expected and the actual result.

How do I achieve the expected result?

[bnasslahsen]

No, this is the swagger-ui default label.

[bnasslahsen]

@debargharoy,

For file format, the not type byte on the spec. You should send type: string, format: binary.

• https://swagger.io/docs/specification/describing-request-body/file-upload/

So, your requestBody for the post methods is correct.

To describe the return of type array of byte on your POST method, you can add the following description:

@ApiResponse(content = @Content(schema = @Schema(type = "string", format = "binary")))