AcceptHeaderHandler checks if the client's response preference is handled.

ContentTypeHandler checks request for the appropriate media types otherwise returning a http.StatusUnsupportedMediaType error.

CorsHandler sets the cors settings on api endpoints.

NormalizeQueryValues replaces comma-separated values with individual values.

NormalizeQueryValuesHandler normalizes an input query of "key=value1,value2,value3" to "key=value1&key=value2&key=value3".