Prefix is not a known prefix

Issue ID: warning-content-type-unknownprefix

Description

You are referencing a media type using an unknown prefix. All media types referenced should be proper MIME types.

Known prefixes for media types are:

application
audio
font
example
image
message
model
multipart
text
video

For more details, see RFC 2046.

Example

The following is an example of how this issue could look in your API definition. The media type prefix has been misspelt:

{
    "/pets": {
        "put": {
            "summary": "Updates a pet in the store with form data",
            "operationId": "updatePetWithForm",
            "produces": [
                "aplication/json"
            ],
            "parameters": [
                // ...
            ]
        }
    }
}

Remediation

Make sure that you only use known media type prefixes.

{
    "/pets": {
        "put": {
            "summary": "Updates a pet in the store with form data",
            "operationId": "updatePetWithForm",
            "produces": [
                "application/json"
            ],
            "parameters": [
                // ...
            ]
        }
    }
}