Easily redirect one entire domain to another with a serverless Cloudflare Worker.

Last update: Dec 11, 2022

Overview

Domain Redirecting with Cloudflare Workers

Easily redirect one entire domain to another with a serverless Cloudflare Worker.

All paths and other data are kept intact. The redirect served is 302 Found (temporary redirect) to prevent cache headache if you ever change your mind.

The aim is to replace lots of Page Rules like this:

And instead use a simple map in domainMaps.json:

{
    "erisa.moe": "erisa.uk",
    "erisa.wales": "erisa.uk",
    "erisa.cymru": "erisa.uk",
    "link.erisa.moe": "erisa.link",
    "cloud.erisa.moe": "erisa.cloud"
}

Note: Cloudflare Workers is a billed product with a free tier available. Page Rules are preferred if cost savings are your priority. This Worker is used to keep domain mapping centralised and to free up Page Rules for other purposes. This is not always what you want.

Code is provided for reference and curiosity purposes, project is only intended to be used personally by the author.
But if you like it, you can use it!

Usage

Required:

Cloudflare DNS
Wrangler (npm i -g wrangler or cargo install wrangler)

Deploy:

Clone the repository
Edit domainMaps.json with source/target pairs of domains to redirect.
wrangler publish

After deploying the worker, ensure that the source domain has a valid DNS record (If not, create an AAAA pointing to 100::) and then head to the Workers tab. Configure example.domain.com/* to use your worker:

Domains that are mapped to the Worker but not listed in domainMaps.json will return a 404 error:

That's all! It's quite simple.

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Comments

URL redirect

Hi Erisa.

Is it possible to have your domain-redirect worker support URL redirect as well?

I.e. blog.domain.com -> domain.com/blog/

I have tried just to just put a URL in the domainMaps.json but when published all blog.domain.com visitors get a 'Worker Error Exception' page in the browser and an "Invalid hostname when stringifying URL" error pops up in the worker stream log.

The Cloudflare free-tier only permits 3-page rules and for my use case, I have both domain and URL redirection rules configured. URL-redirection would let me (and a whole lot of other free-tier users) kill two birds with one stone.
enhancement

opened by KimTholstorf 2

Set an account_id

(building stuff... snip'ed)
✨  Built successfully, built project size is 677 bytes.
👀  You have multiple accounts.
🕵️  You can copy your account_id below
+---------------------+----------------------------------+
| Account Name        | Account ID                       |
+---------------------+----------------------------------+
| [REDACTED] | [REDACTED] |
+---------------------+----------------------------------+
| Me        | [REDACTED] |
+---------------------+----------------------------------+
Error: field `account_id` is required

account_id is required when you have more than one account in your login profile. Add them as optional flags so someone who might use it don't need to figure out what to do (well, it's pretty trivial but saving time is always good...)

opened by revi 1

Easily redirect one entire domain to another with a serverless Cloudflare Worker.

Related tags

Overview

Domain Redirecting with Cloudflare Workers

Usage

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Comments

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Set an account_id

Owner

Erisa A

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