https://github.com/stevenacoffman/localdevdnshttp3
Local DNS Proxy for HTTP3 Local development
https://github.com/stevenacoffman/localdevdnshttp3
dns-server http3-server local-development
Last synced: 3 months ago
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Local DNS Proxy for HTTP3 Local development
- Host: GitHub
- URL: https://github.com/stevenacoffman/localdevdnshttp3
- Owner: StevenACoffman
- Created: 2024-07-12T02:53:58.000Z (11 months ago)
- Default Branch: main
- Last Pushed: 2024-07-12T03:09:43.000Z (11 months ago)
- Last Synced: 2025-03-18T05:40:25.766Z (3 months ago)
- Topics: dns-server, http3-server, local-development
- Language: Go
- Homepage:
- Size: 5.86 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
### local dev dns for http3
Run a local DNS on UDP 127.0.0.1:8353 so you can use HTTP3 for local development.
This will respond to `http3.dev` DNS Queries with the appropriate DNS A, AAAA, SVCB, and HTTPS records for IP4/IP6 loopback address (localhost).
All other DNS requests made will be proxied to cloudflare 1.1.1.1 over TLS. Code works, but is terrible.
### What? Why?
When you want to run HTTP/3 (QUIC) server over UDP locally, you don't want your client to first make a useless request with TCP
to get the `alt-svc` header to retry it with UDP.
DNS SVCB or HTTPS records (they seem identical to me?) provide a signal so that when your browser asks DNS “where’s the example.com server?” the response mentions “oh BTW it supports HTTP/3” and so the browser goes straight to https://example.com over HTTP/3. Otherwise, first-time visitors will commonly go to http://example.com over HTTP/1.1, and then be redirected to https://example.com over HTTP/1.1 or HTTP/2 (negotiated at TLS handshake time), and only use HTTP/3 on subsequent visits.
For local dev, I don't want to bother running HTTP/2 on TCP.
https://blog.cloudflare.com/speeding-up-https-and-http-3-negotiation-with-dns/
If you are on a mac, and you install [ldns](https://github.com/NLnetLabs/ldns), you can test out this DNS proxy.
```
brew install ldns
drill -p 8353 @127.0.0.1 HTTPS http3.dev
```
Should give you this line:
```
http3.dev 3600 IN HTTPS 1 . alpn="h3,h2" ipv4hint="127.0.0.1" ipv6hint="::1"
```
If you use dig:
```
dig -p 8353 @127.0.0.1 http3.dev -t TYPE65
```
Will give you the less helpful RFC3597 encoded format of the answer:
```
http3.dev. 3600 IN TYPE65 \# 41 00010000010006026833026832000400047F00000100060010000000 00000000000000000000000001
```