i am creating an API with ourApiserver script and am trying to communicate with the api on IONIC framework application i am working on but it keeps on bringing up the cross-origin blocked error
When developing locally using ionic serve
or ionic run/emulate -l -c
with livereload enabled, ionic creates a local dev server at port 8100 by default (http://localhost:8100/
). The origin
in this case is localhost:8100
, which when you contact an external service via HTTP with CORS enabled, they deem the request not trustworthy and therefor reject it.
As suggested by Ionic themselves (http://blog.ionic.io/handling-cors-issues-in-ionic/) , you can create a proxy alias within the Ionic app to route the API calls via, avoiding the origin
issue altogether, however, their guide was specific for Ionic 1, so here is an update for Ionic v2.
Open ionic.config.json
and add in the following proxies
setup.
{
"name": "project-name",
"app_id": "xyz-projectid",
"v2": true,
"typescript": true,
"proxies": [{
"path": "/api",
"proxyUrl": "https://the-real-api-host.com"
}]
}
In this instance, we are creating a path within the ionic app at /api
,which will forward requests to the endpoint https://the-real-api-host.com
.
If you wanted to use a different api endpoint, for example http://my-custom-api.com/api/v2/
, you could insert it into proxyUrl
instead.
In your app code, you now need to update all the references of the base URL for the API endpoint at https://the-real-api-host.com
with /api
. A call to /api
should be detected when in Ionic serve, and proxied to the real address.
Each projects implementation may vary. In my case, I did not have control of the API, as it was an external service, so I could not control the CORS handling/responses myself.
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