[HELP] For those using Shlink with Cloudflare
reddit / selfhosted

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CrashOverride93 · 2023-10-02 17:01

When I try to add my Shlink server into my local Shlink Web Client
app, it shows the following error in the web console:

    Cross-origin request blocked: Same-origin policy does not allow
reading remote resources at https://..xxx/rest/v3/health. (Reason:
Unsuccessful CORS request). Status code: (null)

**Shlink**

It's running under Docker, on my server. It's publicly accessible via
Cloudflare Tunnels.
The docker-compose was created with the HTTPS enabled, also the domain
and subdomains loads with HTTPS.

When I try to visit the service using its public address, I can see
the 404 error page, and I can interact with it via cmd.

It's public domain is: [https://links.my-site.com](https://links.my-
site.com/) (just an example)

**Shlink Web Client**

It's running under Docker, on my server. But, it's not publicly
accessible, but being able to connect only from LAN via HTTPS using a
local certificate created with DNS Challenge. It's configured with
Nginx  Proxy Manager.

It's local domain: [https://shlink-wc.my-apps.lan](https://shlink-
wc.my-apps.lan/) (just an example)

So, both Shlink and Shlink Web Client services are under HTTPS.

​

Maybe, something must to be done in Cloudflare actually?

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hdddanbrown · 2023-10-02 17:06

> Maybe, something must to be done in Cloudflare actually?

Yes, maybe? And Cloudflare Tunnels are not selfhosted. Why not ask
Cloudflare for support?

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CrashOverride93 · 2023-10-02 17:07

Because, other services are working as expected.
Only this one shows it.

But than your for your answer.

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hdddanbrown · 2023-10-02 17:35

Still its related to Cloudflare.

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CrashOverride93 · 2023-10-02 17:46

Ok, I have posted it there. Sorry for the inconvenience.

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CrashOverride93 · 2023-10-02 17:50

And, what do you mean with "Cloudflare tunnels are not selfhosted"?

I don't selfhost it hehe. Obviously, it's not something you can
selfhost. Anyway, there's a docker image with which you can create a
container to be able to use CF Tunnels in your account.

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[deleted] · 2023-10-02 21:34

[deleted]

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hdddanbrown · 2023-10-02 21:34

If you dont selfhost it, it doesnt belong here, quite simple.

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shadoodled · 2023-10-03 00:06

I don't know what the solution is but the [documentation](https://shli
nk.io/documentation/troubleshooting/#response-to-preflight-request-
doesnt-pass-access-control-check-no-access-control-allow-origin-
header-is-present) says it could be your reverse proxy.