Is the `cache-control` header set? about cashews

[Krukov]

Yes, this library is framework agnostic.

However there are some experimental functionality that's comes in 6.3.0 version and not documented yet

A cashews.contrib.fastapi module with a set of middlewares: CacheEtagMiddleware, CacheRequestControlMiddleware, CacheDeleteMiddleware

CacheEtagMiddleware - will add the Etag + If-None-Match headers if cache was used during the request handle
CacheRequestControlMiddleware - will handle Cache-Control request and response header, properly disable cache on Cache-Control no-store/no-cache/max-age-0 and add Age and Cache-Control header if cache was used during the request handle
CacheDeleteMiddleware - handle Clear-Site-Data

@ceteri I will be happy if you will try to use it, but at your own risk because it not tested much yet ( but I think that is better then https://github.com/long2ice/fastapi-cache )))

from cashews.contrib.fastapi import CacheRequestControlMiddleware

app = FastAPI()
app.add_middleware(CacheRequestControlMiddleware)

[ceteri]

Thank you @Krukov yes, that looks really good.

cashews/examples/fastapi_app.py

Line 11 in 0b64ec9

from cashews.contrib.fastapi import CacheDeleteMiddleware, CacheEtagMiddleware, CacheRequestControlMiddleware

Ultimately it might also be helpful to include features that take into account the edge (CDN) cache rules, and how the middleware needs to interact with those. For example, https://developers.cloudflare.com/cache/how-to/cache-rules/

We have not seen any caching libraries focus on the edge or intermediate storage grids used by edge caches. We've built out code to handle this, although it is not generalized in a way that it could be used readily in a framework-agnostic library.

[Krukov]

I'll keep this issue open till I will add documentation about this "contrib" module

[Krukov]

Hi @shijo-keyvalue - Looks like a bug with python3.7 support , I will take a look at weekends. Also I found a few bugs with CacheRequestControlMiddleware - I gonna fix it soon, stay tuned )

[AIGeneratedUsername]

Could you please clarify your use case and what you want to achieve or share a small code example?

If you are talking about caching HTTP responses with a minimal setup on your side, then you can look at https://github.com/requests-cache/aiohttp-client-cache or https://github.com/requests-cache/requests-cache

[ceteri]

When HTTP page response get cached, shouldn't there also be directives communicated to the CDN and client through Cache-Control headers:
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control

As far as I can tell, the @cache decorator here does not modify FastAPI/Starlette response headers?

For example, using @cache(ttl="30s") should that also set a directive such as

Cache-Control: max-age=30

Handling ETags are another matter.

[ceteri]

Also, my apologies if I'm conflating the intended usage.

It has been a common practice for cache libraries on web frameworks to support both the caching strategy and the directives from the decorator. Although clearly that's not needed if the cache is used internally, not for HTTP routes.

[shijo-keyvalue]

Tried adding middleware as mentioned in the above comments :

app.add_middleware(CacheRequestControlMiddleware)

But I am getting this error while starting the server.

...lib/python3.7/site-packages/cashews/contrib/fastapi.py", line 86, in CacheRequestControlMiddleware
    def _to_disable(cache_control_value: Optional[str]) -> tuple[Command]:
TypeError: 'type' object is not subscriptable

@ceteri @Krukov

[Krukov]

Added a few words in README (documentation) about contrib module and integrations/tools for an fastapi app

@shijo-keyvalue Sorry but I dropped 3.7 support as we don't have CI pipelines for it and it's a very "unpopular" version.