From 67a0d069446ffb67dd3d3f3fbd8c52e673e93e6b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=88=98=E7=A5=A5=E8=B6=85?= <iwind.liu@gmail.com>
Date: Thu, 20 Jul 2023 16:42:54 +0800
Subject: [PATCH] =?UTF-8?q?=E7=BC=93=E5=AD=98=E6=9D=A1=E4=BB=B6=E4=B8=80?=
 =?UTF-8?q?=E4=BA=9B=E6=97=A0=E6=B3=95=E5=8C=B9=E9=85=8D=E7=9A=84=E6=83=85?=
 =?UTF-8?q?=E5=86=B5=E5=9C=A8X-Cache=E4=B8=AD=E4=B9=9F=E5=A2=9E=E5=8A=A0?=
 =?UTF-8?q?=E8=AF=A6=E6=83=85?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 internal/nodes/http_request_cache.go | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/internal/nodes/http_request_cache.go b/internal/nodes/http_request_cache.go
index 52ba862..efd81d3 100644
--- a/internal/nodes/http_request_cache.go
+++ b/internal/nodes/http_request_cache.go
@@ -38,8 +38,13 @@ func (this *HTTPRequest) doCacheRead(useStale bool) (shouldStop bool) {
 
 	// 添加 X-Cache Header
 	var addStatusHeader = this.web.Cache.AddStatusHeader
+	var cacheBypassDescription = ""
 	if addStatusHeader {
 		defer func() {
+			if len(cacheBypassDescription) > 0 {
+				this.writer.Header().Set("X-Cache", cacheBypassDescription)
+				return
+			}
 			var cacheStatus = this.varMapping["cache.status"]
 			if cacheStatus != "HIT" {
 				this.writer.Header().Set("X-Cache", cacheStatus)
@@ -94,6 +99,7 @@ func (this *HTTPRequest) doCacheRead(useStale bool) (shouldStop bool) {
 	// 校验请求
 	if !this.cacheRef.MatchRequest(this.RawReq) {
 		this.cacheRef = nil
+		cacheBypassDescription = "BYPASS, not match"
 		return
 	}
 
@@ -106,6 +112,7 @@ func (this *HTTPRequest) doCacheRead(useStale bool) (shouldStop bool) {
 	if this.cacheRef.EnableRequestCachePragma {
 		if this.RawReq.Header.Get("Cache-Control") == "no-cache" || this.RawReq.Header.Get("Pragma") == "no-cache" {
 			this.cacheRef = nil
+			cacheBypassDescription = "BYPASS, Cache-Control or Pragma"
 			return
 		}
 	}
@@ -119,6 +126,7 @@ func (this *HTTPRequest) doCacheRead(useStale bool) (shouldStop bool) {
 	var key = this.Format(this.cacheRef.Key)
 	if len(key) == 0 {
 		this.cacheRef = nil
+		cacheBypassDescription = "BYPASS, empty key"
 		return
 	}
 	var method = this.Method()
@@ -134,6 +142,7 @@ func (this *HTTPRequest) doCacheRead(useStale bool) (shouldStop bool) {
 	var storage = caches.SharedManager.FindStorageWithPolicy(cachePolicy.Id)
 	if storage == nil {
 		this.cacheRef = nil
+		cacheBypassDescription = "BYPASS, no policy found"
 		return
 	}
 	this.writer.cacheStorage = storage