[Bug]: API img2img not accepting bare base64 strings

[MaikoTan]

Is there an existing issue for this?

• [X] I have searched the existing issues and checked the recent builds/commits

What happened?

In the prototype version of API, the img2img accepts both data URLs and bare base64 strings. But recently I found that it only accept data URLs now, since the PR #3511 . If you still request the API with bare base64 strings, it would report an error like

  File "/***/stable-diffusion-webui/modules/api/api.py", line 84, in img2imgapi
    mask = decode_base64_to_image(mask)
  File "/***/stable-diffusion-webui/venv/lib/python3.10/site-packages/gradio/processing_utils.py", line 45, in decode_base64_to_image
    content = encoding.split(";")[1]
IndexError: list index out of range

Steps to reproduce the problem

1. Run webui with --api
2. Request the api /sdapi/v1/img2img with base64 encoded image
3. Error occurred.

What should have happened?

I think it should accept both type of it, just like the prototype did.

Commit where the problem happens

07d1bd426722b4c53b38ff682c5aab53177d8530

What platforms do you use to access UI ?

Windows, Linux

What browsers do you use to access the UI ?

Google Chrome

Command Line Arguments

--api

Additional information, context and logs

cc @bamarillo

[aliencaocao]

The standard way is dataURLs, this is inline with the new gradio return format which also used to be base64 only but now dataURLs.

[MaikoTan]

Sure, I can fix my code to use data URLs in requesting the API. But I think it still is better to catch the exception?

[ClashSAN]

fixed in https://github.com/AUTOMATIC1111/stable-diffusion-webui/pull/4977