A HTTP header in multipart/form-data is handled as form item instead of header

[jarekkar]

Describe the bug
A HTTP header in multipart/form-data is handled as form item instead of header

To Reproduce

• java: 17
• spring-boot: 2.7.3
• springdoc-openapi: 1.6.11
• actual OpenAPI description: openjson.txt

"multipart/form-data" : {
    "schema" : {
        "required" : [ "file", "request" ],
        "type" : "object",
        "properties" : {
            "request" : {
                "$ref" : "#/components/schemas/GreetRequest"
            },
            "file" : {
                "type" : "string",
                "format" : "binary"
            },
            "My-Header" : { }
        }
    }
}

• Sample controller:

@Operation(summary = "Test Endpoint")
@PostMapping(value = "/upload", consumes = MediaType.MULTIPART_FORM_DATA_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
@ResponseStatus(OK)
GreetResponse upload(
    @RequestHeader("My-Header") String workspaceId,
    @RequestPart("request") GreetRequest request,
    @RequestPart("file") MultipartFile file
) {
    return GreetResponse.of("Hello World!");
}

record GreetRequest(String message1, String message2, String message3) {

}

record GreetResponse(String message) {

    static GreetResponse of(String message) {
        return new GreetResponse(message);
    }
}

Expected behavior

• A HTTP header in multipart/form-data should be handled as a header not form item

Screenshots

[bnasslahsen]

@jarekkar,

This is a regression. The workaround is to use:

springdoc.default-support-form-data=false

It will be fixed for next release.