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API_CALLS_ISSUE.md

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ComfyUI Desktop API Calls Issue

Problem Identified

The ComfyUI-Chord nodes use Hugging Face API calls to download Stable Diffusion 2.1 components, which may not work in ComfyUI Desktop due to:

  1. Network restrictions - ComfyUI Desktop may block network requests
  2. Security policies - Desktop apps often have stricter security
  3. Missing internet access - Desktop version might run in isolated environment
  4. Different diffusers behavior - The diffusers library may behave differently in Desktop

Where the API Calls Happen

File: chord/chord/module/stable_diffusion.py

Lines 51-66: These methods download from Hugging Face:

  • UNet2DConditionModel.load_config() - Downloads UNet config
  • UNet2DConditionModel.from_config() - Downloads UNet weights
  • AutoencoderKL.load_config() - Downloads VAE config
  • AutoencoderKL.from_config() - Downloads VAE weights
  • CLIPTextConfig.from_pretrained() - Downloads CLIP config
  • CLIPTokenizer.from_pretrained() - Downloads tokenizer (requires vocab download)
  • DDIMScheduler.load_config() - Downloads scheduler config

Current setting: local_files_only = False (line 35) - Allows downloads

Solution Implemented

Desktop Edition uses: local_files_only = True by default

This ensures:

  • ✅ No API calls to HuggingFace during runtime
  • ✅ Works offline once model is cached
  • ✅ Reliable in ComfyUI Desktop's Electron environment

User Setup:

  • Users run download_sd21.bat to pre-download Stable Diffusion 2.1
  • Model is cached locally (~5GB)
  • Chord nodes work offline after initial setup