修复锐速云验证码图片显示的bug

nginx.conf

@@ -64,10 +64,10 @@ http {
                 local current_uri = ngx.var.uri
                 -- 判断是不是蒙城网站的验证码
                 local filepath
-                if filename ~= "1710935454" then -- 如果不是蒙城验证码图片
-                    filepath = ngx.var.root_path .. "/resources/default/" .. filename
-                else
+                if filename == "1710935454" or filename == "3568918852.aspx" then
                     filepath = ngx.var.root_path .. current_uri
+                else
+                    filepath = ngx.var.root_path .. "/resources/default/" .. filename
                 end
 
                 local max_retries = 30 -- 重试次数（含首次检查）
@@ -173,8 +173,12 @@ http {
                             ngx.header["Cache-Control"] = "max-age=86400"
                             ngx.say(content)
 
-                            os.remove(filepath)
+                            local ok, err = os.remove(filepath)
+                            if ok then
                                 ngx.log(ngx.INFO, "File deleted after serving: ", filepath)
+                            else
+                                ngx.log(ngx.WARN, "Failed to delete file: ", filepath, ", error: ", err)
+                            end
 
                             return ngx.exit(ngx.HTTP_OK)
                         else