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"""Cache control middleware for ComfyUI server"""
from aiohttp import web
from typing import Callable, Awaitable
# Time in seconds
ONE_HOUR: int = 3600
ONE_DAY: int = 86400
IMG_EXTENSIONS = (
".jpg",
".jpeg",
".png",
".ppm",
".bmp",
".pgm",
".tif",
".tiff",
".webp",
)
@web.middleware
async def cache_control(
request: web.Request, handler: Callable[[web.Request], Awaitable[web.Response]]
) -> web.Response:
"""Cache control middleware that sets appropriate cache headers based on file type and response status"""
response: web.Response = await handler(request)
if (
request.path.endswith(".js")
or request.path.endswith(".css")
or request.path.endswith("index.json")
):
response.headers.setdefault("Cache-Control", "no-cache")
return response
# Early return for non-image files - no cache headers needed
if not request.path.lower().endswith(IMG_EXTENSIONS):
return response
# Handle image files
if response.status == 404:
response.headers.setdefault("Cache-Control", f"public, max-age={ONE_HOUR}")
elif response.status in (200, 201, 202, 203, 204, 205, 206, 301, 308):
# Success responses and permanent redirects - cache for 1 day
response.headers.setdefault("Cache-Control", f"public, max-age={ONE_DAY}")
elif response.status in (302, 303, 307):
# Temporary redirects - no cache
response.headers.setdefault("Cache-Control", "no-cache")
# Note: 304 Not Modified falls through - no cache headers set
return response
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