preflight

Before performing a request, the library will check whether it should, based on logic and cache control.

Should perform

Here are the conditions that would immediately cancel a request:

Request method	Condition	Explanation
GET	An identical request (same URL, same query parameters) is already performing	We will receive the payload of the first request sooner than the payload of the second, and there is no reason they should differ
POST	An identical request (same URL) is already performing	We didn't find a way to effectively monitor POST requests. For a given resource, they have the same URL, and often the same body. However, tou can use cache hints to differentiate multiple POST requests with the same URL
PATCH	An identical request (same URL) is already performing	The second request might be based on outdated info, which will be updated when we receive the payload of the first request
PUT	An identical request (same URL) is already performing	Same as for PATCH
DELETE	An identical request (same URL) is already performing	A resource can only be deleted once

Cache control

And here are the conditions that would cancel a request based on cache control:

Request method	Condition
GET	- The exact same request has succeeded and its cache is still valid - The request is about a resource/id pair which has already been retrieved, and the cache is still valid
POST	No cache
PATCH	No cache
PUT	No cache
DELETE	No cache