Client does not support default parameters in functions

[dbalabka]

• I have searched to see if a similar issue already exists.

Is your feature request related to a problem? Please describe.
Adding new input into gr.Interface leads to backward incompatible changes in API and leads to the following error:

{
  "error": "list index out of range"
}

In my particular case, I've added:

gr.Radio(["vtt", "txt", "srt", "tsv", "json"], value='vtt', label='Caption file format'),

This input has a default value and does not require input. Still, it leads to 500 Internal Server Error

Describe the solution you'd like
The simplest solution is to allow skipping the values with default values.

Additional context
Gradio version is 3.21.0

[abidlabs]

Hi @dbalabka I think the issue here is that setting a value in the gr.Radio does not make it a default value in your function. It only makes it the initially populated value in your UI. This is by design. If you want it to be the default value in your function, simply set it as such in your Python function. E.g. something like this:

def my_function(name, choice="vtt"):
   pass

Then your API should be backwards compatible. Lmk if this solves your problem.

[dbalabka]

@abidlabs, the default value present in the function's parameter :

def transcribe(
        language = 'auto',
        audio = None,
        audio_file = None,
        output_format = 'vtt',
)

Anyway, the API should not return the 500 error. It should be classified as 400 Bad requests instead.

[dbalabka]

Thanks @abidlabs