静态资源加缓存

nginx.conf

@@ -88,6 +88,14 @@ http {
                     return ngx.exit(ngx.HTTP_NOT_FOUND)
                 end
 
+                local etag = string.format("%x-%x", attributes.mtime, attributes.size)
+                etag = '"' .. etag .. '"'
+                local if_none_match = ngx.req.get_headers()["If-None-Match"]
+                if if_none_match == etag then
+                    ngx.status = 304
+                    return
+                end
+
                 -- 2. 判断是否有扩展名
                 local ext = string.match(filename, "%.([^%.]+)$")
                 local mime_type
@@ -105,9 +113,11 @@ http {
                 -- 3. 设置响应头
                 ngx.header["Content-Type"] = mime_type
                 ngx.header["Content-Length"] = attributes.size
-                ngx.header["Cache-Control"] = "no-store, no-cache, must-revalidate, max-age=0"
-                ngx.header["Pragma"] = "no-cache"
-                ngx.header["Expires"] = "0"
+                ngx.header["Cache-Control"] = "max-age=86400"
+                ngx.header["ETag"] = etag
+                -- ngx.header["Cache-Control"] = "no-store, no-cache, must-revalidate, max-age=0"
+                -- ngx.header["Pragma"] = "no-cache"
+                -- ngx.header["Expires"] = "0"
 
                 local file = io.open(filepath, "rb")
                 if file then
@@ -123,9 +133,11 @@ http {
         location /download/ {
             internal; # 标记为内部 location，不允许外部直接访问
             alias /var/www/html/resources/default/; # 设置文件根目录
-            add_header Cache-Control "no-store, no-cache, must-revalidate, max-age=0";
-            add_header Pragma "no-cache";
-            add_header Expires "0";
+            etag on;
+            #add_header Cache-Control "no-store, no-cache, must-revalidate, max-age=0";
+            #add_header Pragma "no-cache";
+            #add_header Expires "0";
+            add_header Cache-Control "max-age=86400";
             sendfile on;
         } 
         # 未匹配的请求