修复锐速云验证码访问图裂bug

nginx.conf

@@ -62,10 +62,13 @@ http {
                     return ngx.exit(ngx.HTTP_NOT_FOUND)
                 end
                 local current_uri = ngx.var.uri
+
                 local clean_uri = current_uri
-                if string.sub(current_uri, 1, 10) == "/fileserver/" then
-                    clean_uri = string.sub(current_uri, 11) -- 去掉前10个字符 "/fileserver/"
+                local prefix = "/fileserver/"
+                if string.sub(current_uri, 1, #prefix) == prefix then
+                    clean_uri = string.sub(current_uri, #prefix + 1)
                 end
+
                 local filepath
                 -- 判断是蒙城网站的验证码或者锐速云验证码
                 if filename == "1710935454" or filename == "3568918852.aspx" then
@@ -77,7 +80,7 @@ http {
                 local max_retries = 30 -- 重试次数（含首次检查）
                 local retry_delay = 0.5 -- 重试延迟（秒）
 
-                ngx.log(ngx.WARN, "AFA request filpath: ", filepath, " filename: ",filename, "ngx.var.root_path: ",ngx.var.root_path, "clean_uri:",clean_uri,"current_uri:",current_uri)
+                ngx.log(ngx.WARN, "AFA request filpath: ", filepath, " filename: ",filename)
                 local mime_types = {
                     ["html"] = "text/html",
                     ["css"]  = "text/css",