From 42e140b1b2f5fc3f602151947dc981334b338020 Mon Sep 17 00:00:00 2001
From: hmol233 <82594500+hmol233@users.noreply.github.com>
Date: Wed, 7 Jul 2021 00:09:44 +0800
Subject: caddyhttp: Fix incorrect determination of gRPC protocol (#4236)

---
 modules/caddyhttp/matchers.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/modules/caddyhttp/matchers.go b/modules/caddyhttp/matchers.go
index 9b127dbc2..1a49b3c04 100644
--- a/modules/caddyhttp/matchers.go
+++ b/modules/caddyhttp/matchers.go
@@ -667,7 +667,7 @@ func (MatchProtocol) CaddyModule() caddy.ModuleInfo {
 func (m MatchProtocol) Match(r *http.Request) bool {
 	switch string(m) {
 	case "grpc":
-		return r.Header.Get("content-type") == "application/grpc"
+		return strings.HasPrefix(r.Header.Get("content-type"), "application/grpc")
 	case "https":
 		return r.TLS != nil
 	case "http":
-- 
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