设置锐速云验证码文件禁止缓存

nginx.conf

@@ -177,7 +177,9 @@ http {
 
                             ngx.header["Content-Type"] = mime_type
                             ngx.header["Content-Length"] = attributes.size
-                            ngx.header["Cache-Control"] = "max-age=86400"
+                            ngx.header["Cache-Control"] = "no-cache, no-store, must-revalidate"
+                            ngx.header["Pragma"] = "no-cache"
+                            ngx.header["Expires"] = "0"
                             ngx.say(content)
 
                             local ok, err = os.remove(filepath)