From a10e28210ab0ab6de566460da1ea4dea741c5c9f Mon Sep 17 00:00:00 2001
From: Catherine <whitequark@whitequark.org>
Date: Sun, 21 Sep 2025 03:36:14 +0000
Subject: [PATCH] Enable h2c:// (cleartext HTTP/2) protocol on all http://
 sockets.

This allows git-pages and Caddy to efficiently use the same connection
for many pipelined requests, which I hope will reduce contention when
some bot decides to send fifty requests in the same millisecond.

This commit also changes built-in Caddy configuration to use HTTP/2
cleartext only when talking to the backend.
---
 conf/Caddyfile | 6 +++---
 src/main.go    | 7 ++++++-
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/conf/Caddyfile b/conf/Caddyfile
index 48ed556..62e9986 100644
--- a/conf/Caddyfile
+++ b/conf/Caddyfile
@@ -51,7 +51,7 @@ http:// {
 	redir @get https://{host}{uri} 301
 
 	# initial PUT/POST for a new domain has to happen over HTTP
-	reverse_proxy http://{$GIT_PAGES_ADDRESS:localhost}:3000
+	reverse_proxy h2c://{$GIT_PAGES_ADDRESS:localhost}:3000
 }
 
 https:// {
@@ -60,9 +60,9 @@ https:// {
 	}
 
 	encode
-	reverse_proxy http://{$GIT_PAGES_ADDRESS:localhost}:3000
+	reverse_proxy h2c://{$GIT_PAGES_ADDRESS:localhost}:3000
 }
 
 http://localhost:2002 {
-	reverse_proxy http://{$GIT_PAGES_ADDRESS:localhost}:3002
+	reverse_proxy h2c://{$GIT_PAGES_ADDRESS:localhost}:3002
 }
diff --git a/src/main.go b/src/main.go
index ccbdff1..1174aaf 100644
--- a/src/main.go
+++ b/src/main.go
@@ -53,7 +53,12 @@ func serve(listener net.Listener, serve func(http.ResponseWriter, *http.Request)
 		handler = http.HandlerFunc(serve)
 		handler = ObserveHTTPHandler(handler)
 		handler = panicHandler(handler)
-		log.Fatalln(http.Serve(listener, handler))
+
+		server := http.Server{Handler: handler}
+		server.Protocols = new(http.Protocols)
+		server.Protocols.SetHTTP1(true)
+		server.Protocols.SetUnencryptedHTTP2(true)
+		log.Fatalln(server.Serve(listener))
 	}
 }