multipart/form-data request validation not supported

Swagger specification mentions two form parameter types: application/x-www-form-urlencoded and multipart/form-data, but Swagger Request Validator only accepts a request with body when the consumes field is application/x-www-form-urlencoded.

An example of a request that doesn't pass the validation can be found in the pet store specification from Swagger for the POST /pet/{petId}/uploadImage:

"/pet/{petId}/uploadImage": {
    "post": {
        "tags": [
            "pet"
        ],
        "summary": "uploads an image",
        "description": "",
        "operationId": "uploadFile",
        "consumes": [
            "multipart/form-data"
        ],
        "produces": [
            "application/json"
        ],
        "parameters": [{
                "name": "petId",
                "in": "path",
                "description": "ID of pet to update",
                "required": true,
                "type": "integer",
                "format": "int64"
            },
            {
                "name": "additionalMetadata",
                "in": "formData",
                "description": "Additional data to pass to server",
                "required": false,
                "type": "string"
            },
            {
                "name": "file",
                "in": "formData",
                "description": "file to upload",
                "required": false,
                "type": "file"
            }
        ],
        "responses": {
            "200": {
                "description": "successful operation",
                "schema": {
                    "$ref": "#/definitions/ApiResponse"
                }
            }
        },
        "security": [{
            "petstore_auth": [
                "write:pets",
                "read:pets"
            ]
        }]
    }
}

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