$http : ability to clear a request from the cache

[njs50]

At the moment there isn't a direct way in $http to clear the cache.

I know it's possible to use $cacheFactory to return the default or custom cache.
However to be able to use this with 100% confidence i'd also need the buildUrl function from $http exposed to generate the key.

so it'd be nice if we had either:

$http.buildUrl(url,params) made public

or something like:

$http.removeCache(url, params (optional), cache (optional))

If either of those sounds like they'd be a good idea I'm happy to put together a PR for it...

[jmendiara]

@njs50 Take a look to https://github.com/angular-hu/angular-hu/tree/develop/src/headers . I'm using it to remove requests from the cache

[njs50]

@jmendiara that looks handy, my issue is more that I don't think it's a good idea to have a cache where you can't remove things without having to modify/decorate the core code in some way.

currently I do both:

1. invalidate an $http cache without requesting new data
2. invalidate an $http cache and repeat the request to repopulate the cache

(1) is usually in response to something that happened on a remote system and (2) is in reaction to something the user has done.

[jmendiara]

@njs50 Agree, httpu.headers gives you the cache key for a specific request, so the controlller/service can invalidate them. It's a foundation to implement your specific app business logic.

$http.get('/api', {
  cache: myCacheImpl
})
.then(function(response) {
  $scope.cacheKey = response.headers('httpu-request-url'); //store to react on user action (2)
})
.catch(function(rejection) {
  if (rejection.data.error) { //your app condition for (1)
    rejection.config.cache.remove(rejection.headers('httpu-request-url')); //or directly myCacheImpl
  }
});

You can also take a look to httpu.urlbuilder to re-calculate the request-url.