diff --git a/conf/conf.d/ai.sggai.site.conf b/conf/conf.d/ai.sggai.site.conf
index 65f623c..8337fe4 100644
--- a/conf/conf.d/ai.sggai.site.conf
+++ b/conf/conf.d/ai.sggai.site.conf
@@ -1,63 +1,149 @@
 server {
     listen 80;
-    listen 443 ssl;
+    # http2 on;
     server_name ai.sggai.site;
 
-    ssl_certificate /etc/letsencrypt/live/ai.sggai.site/fullchain.pem;
-    ssl_certificate_key /etc/letsencrypt/live/ai.sggai.site/privkey.pem;
-
-    error_log /usr/local/openresty/nginx/logs/ai.sggai.site.error.log notice;
-    error_log /dev/stderr notice;
-
     location ^~ /.well-known/acme-challenge/ {
         root /var/www;
         default_type text/plain;
         try_files $uri =404;
     }
 
+    # 关键：允许 Session_id 这种带下划线的请求头
+    # underscores_in_headers on;
+    # ignore_invalid_headers off;
+
+    client_max_body_size 200m;
+
+    gzip off;
+    gunzip off;
+    location / {
+        proxy_pass http://10.1.0.1:3001;
+        proxy_http_version 1.1;
+
+        # 保持你原来“模拟 IP 直连”的行为
+        proxy_set_header Host $host;
+
+        # 基础请求头
+        proxy_set_header Authorization $http_authorization;
+        proxy_set_header Content-Type $http_content_type;
+        proxy_set_header Accept $http_accept;
+        proxy_set_header User-Agent $http_user_agent;
+
+        # 关键：Codex / 上游 prompt cache 相关头
+        proxy_set_header Originator $http_originator;
+        proxy_set_header Session_id $http_session_id;
+        proxy_set_header X-Codex-Beta-Features $http_x_codex_beta_features;
+        proxy_set_header X-Codex-Turn-Metadata $http_x_codex_turn_metadata;
+
+        # Claude CLI 相关头，保留无害
+        proxy_set_header X-Stainless-Arch $http_x_stainless_arch;
+        proxy_set_header X-Stainless-Lang $http_x_stainless_lang;
+        proxy_set_header X-Stainless-Os $http_x_stainless_os;
+        proxy_set_header X-Stainless-Package-Version $http_x_stainless_package_version;
+        proxy_set_header X-Stainless-Retry-Count $http_x_stainless_retry_count;
+        proxy_set_header X-Stainless-Runtime $http_x_stainless_runtime;
+        proxy_set_header X-Stainless-Runtime-Version $http_x_stainless_runtime_version;
+        proxy_set_header X-Stainless-Timeout $http_x_stainless_timeout;
+        proxy_set_header X-App $http_x_app;
+        proxy_set_header Anthropic-Beta $http_anthropic_beta;
+        proxy_set_header Anthropic-Dangerous-Direct-Browser-Access $http_anthropic_dangerous_direct_browser_access;
+        proxy_set_header Anthropic-Version $http_anthropic_version;
+
+        # 禁用压缩干扰
+        proxy_set_header Accept-Encoding "";
+
+        # 继续模拟直连，不暴露外层代理链
+        proxy_set_header X-Real-IP "";
+        proxy_set_header X-Forwarded-For "";
+        proxy_set_header X-Forwarded-Proto "";
+        proxy_set_header X-Forwarded-Host "";
+        proxy_set_header X-Forwarded-Port "";
+
+        proxy_set_header Connection "";
+
+        # SSE / 流式响应
+        proxy_buffering off;
+        proxy_request_buffering off;
+        proxy_cache off;
+        proxy_cache_bypass 1;
+
+        proxy_connect_timeout 600s;
+        proxy_read_timeout 3600s;
+        proxy_send_timeout 3600s;
+    }
+}
+server {
+    listen 443 ssl;
+    # http2 on;
+
+    server_name ai.sggai.site;
+
+    ssl_certificate /etc/letsencrypt/live/ai.sggai.site/fullchain.pem;
+    ssl_certificate_key /etc/letsencrypt/live/ai.sggai.site/privkey.pem;
+
+    # 关键：允许 Session_id 这种带下划线的请求头  http2 on 和下面这2个加上就容易出 status_code=400, Invalid 'prompt_cache_key': string too long. Expected a string with maximum length 64, but got a string with length 74 instead.
+    # underscores_in_headers on;
+    # ignore_invalid_headers off;
+
     client_max_body_size 200m;
 
     gzip off;
     gunzip off;
 
-    proxy_http_version 1.1;
-    proxy_set_header Host $host;
-    proxy_set_header Authorization $http_authorization;
-    proxy_set_header Content-Type $http_content_type;
-    proxy_set_header Accept $http_accept;
-    proxy_set_header User-Agent $http_user_agent;
-    proxy_set_header Originator $http_originator;
-    proxy_set_header Session_id $http_session_id;
-    proxy_set_header X-Codex-Beta-Features $http_x_codex_beta_features;
-    proxy_set_header X-Codex-Turn-Metadata $http_x_codex_turn_metadata;
-    proxy_set_header X-Stainless-Arch $http_x_stainless_arch;
-    proxy_set_header X-Stainless-Lang $http_x_stainless_lang;
-    proxy_set_header X-Stainless-Os $http_x_stainless_os;
-    proxy_set_header X-Stainless-Package-Version $http_x_stainless_package_version;
-    proxy_set_header X-Stainless-Retry-Count $http_x_stainless_retry_count;
-    proxy_set_header X-Stainless-Runtime $http_x_stainless_runtime;
-    proxy_set_header X-Stainless-Runtime-Version $http_x_stainless_runtime_version;
-    proxy_set_header X-Stainless-Timeout $http_x_stainless_timeout;
-    proxy_set_header X-App $http_x_app;
-    proxy_set_header Anthropic-Beta $http_anthropic_beta;
-    proxy_set_header Anthropic-Dangerous-Direct-Browser-Access $http_anthropic_dangerous_direct_browser_access;
-    proxy_set_header Anthropic-Version $http_anthropic_version;
-    proxy_set_header Accept-Encoding "";
-    proxy_set_header X-Real-IP "";
-    proxy_set_header X-Forwarded-For "";
-    proxy_set_header X-Forwarded-Proto "";
-    proxy_set_header X-Forwarded-Host "";
-    proxy_set_header X-Forwarded-Port "";
-    proxy_set_header Connection "";
-    proxy_buffering off;
-    proxy_request_buffering off;
-    proxy_cache off;
-    proxy_cache_bypass 1;
-    proxy_connect_timeout 600s;
-    proxy_read_timeout 3600s;
-    proxy_send_timeout 3600s;
-
     location / {
         proxy_pass http://10.1.0.1:3001;
+        proxy_http_version 1.1;
+
+        # 保持你原来“模拟 IP 直连”的行为
+        proxy_set_header Host $host;
+
+        # 基础请求头
+        proxy_set_header Authorization $http_authorization;
+        proxy_set_header Content-Type $http_content_type;
+        proxy_set_header Accept $http_accept;
+        proxy_set_header User-Agent $http_user_agent;
+
+        # 关键：Codex / 上游 prompt cache 相关头
+        proxy_set_header Originator $http_originator;
+        proxy_set_header Session_id $http_session_id;
+        proxy_set_header X-Codex-Beta-Features $http_x_codex_beta_features;
+        proxy_set_header X-Codex-Turn-Metadata $http_x_codex_turn_metadata;
+
+        # Claude CLI 相关头，保留无害
+        proxy_set_header X-Stainless-Arch $http_x_stainless_arch;
+        proxy_set_header X-Stainless-Lang $http_x_stainless_lang;
+        proxy_set_header X-Stainless-Os $http_x_stainless_os;
+        proxy_set_header X-Stainless-Package-Version $http_x_stainless_package_version;
+        proxy_set_header X-Stainless-Retry-Count $http_x_stainless_retry_count;
+        proxy_set_header X-Stainless-Runtime $http_x_stainless_runtime;
+        proxy_set_header X-Stainless-Runtime-Version $http_x_stainless_runtime_version;
+        proxy_set_header X-Stainless-Timeout $http_x_stainless_timeout;
+        proxy_set_header X-App $http_x_app;
+        proxy_set_header Anthropic-Beta $http_anthropic_beta;
+        proxy_set_header Anthropic-Dangerous-Direct-Browser-Access $http_anthropic_dangerous_direct_browser_access;
+        proxy_set_header Anthropic-Version $http_anthropic_version;
+
+        # 禁用压缩干扰
+        proxy_set_header Accept-Encoding "";
+
+        # 继续模拟直连，不暴露外层代理链
+        proxy_set_header X-Real-IP "";
+        proxy_set_header X-Forwarded-For "";
+        proxy_set_header X-Forwarded-Proto "";
+        proxy_set_header X-Forwarded-Host "";
+        proxy_set_header X-Forwarded-Port "";
+
+        proxy_set_header Connection "";
+
+        # SSE / 流式响应
+        proxy_buffering off;
+        proxy_request_buffering off;
+        proxy_cache off;
+        proxy_cache_bypass 1;
+
+        proxy_connect_timeout 600s;
+        proxy_read_timeout 3600s;
+        proxy_send_timeout 3600s;
     }
 }
diff --git a/conf/conf.d/ai.sggai.site.conf.1back b/conf/conf.d/ai.sggai.site.conf.1back
new file mode 100644
index 0000000..784d691
--- /dev/null
+++ b/conf/conf.d/ai.sggai.site.conf.1back
@@ -0,0 +1,147 @@
+server {
+    listen 80;
+    listen 443 ssl;
+    server_name ai.sggai.site;
+
+    ssl_certificate /etc/letsencrypt/live/ai.sggai.site/fullchain.pem;
+    ssl_certificate_key /etc/letsencrypt/live/ai.sggai.site/privkey.pem;
+
+    error_log /usr/local/openresty/nginx/logs/ai.sggai.site.error.log notice;
+    error_log /dev/stderr notice;
+
+    location ^~ /.well-known/acme-challenge/ {
+        root /var/www;
+        default_type text/plain;
+        try_files $uri =404;
+    }
+
+    client_max_body_size 200m;
+
+    gzip off;
+    gunzip off;
+
+    proxy_http_version 1.1;
+    proxy_set_header Host $host;
+    proxy_set_header Authorization $http_authorization;
+    proxy_set_header Content-Type $http_content_type;
+    proxy_set_header Accept $http_accept;
+    proxy_set_header User-Agent $http_user_agent;
+    proxy_set_header Originator $http_originator;
+    proxy_set_header Session_id $http_session_id;
+    proxy_set_header X-Codex-Beta-Features $http_x_codex_beta_features;
+    proxy_set_header X-Codex-Turn-Metadata $http_x_codex_turn_metadata;
+    proxy_set_header X-Stainless-Arch $http_x_stainless_arch;
+    proxy_set_header X-Stainless-Lang $http_x_stainless_lang;
+    proxy_set_header X-Stainless-Os $http_x_stainless_os;
+    proxy_set_header X-Stainless-Package-Version $http_x_stainless_package_version;
+    proxy_set_header X-Stainless-Retry-Count $http_x_stainless_retry_count;
+    proxy_set_header X-Stainless-Runtime $http_x_stainless_runtime;
+    proxy_set_header X-Stainless-Runtime-Version $http_x_stainless_runtime_version;
+    proxy_set_header X-Stainless-Timeout $http_x_stainless_timeout;
+    proxy_set_header X-App $http_x_app;
+    proxy_set_header Anthropic-Beta $http_anthropic_beta;
+    proxy_set_header Anthropic-Dangerous-Direct-Browser-Access $http_anthropic_dangerous_direct_browser_access;
+    proxy_set_header Anthropic-Version $http_anthropic_version;
+    proxy_set_header Accept-Encoding "";
+    proxy_set_header X-Real-IP "";
+    proxy_set_header X-Forwarded-For "";
+    proxy_set_header X-Forwarded-Proto "";
+    proxy_set_header X-Forwarded-Host "";
+    proxy_set_header X-Forwarded-Port "";
+    proxy_set_header Connection "";
+    proxy_buffering off;
+    proxy_request_buffering off;
+    proxy_cache off;
+    proxy_cache_bypass 1;
+    proxy_connect_timeout 600s;
+    proxy_read_timeout 3600s;
+    proxy_send_timeout 3600s;
+
+    location = /v1/chat/completions {
+        client_body_buffer_size 16k;
+
+        content_by_lua_block {
+            local backend = "@ai_sggai_site_backend"
+            local max_body_bytes = 1024
+
+            if ngx.req.get_method() ~= "POST" then
+                return ngx.exec(backend)
+            end
+
+            local content_length = tonumber(ngx.var.http_content_length)
+            if not content_length then
+                return ngx.exec(backend)
+            end
+
+            if content_length > max_body_bytes then
+                return ngx.exec(backend)
+            end
+
+            ngx.req.read_body()
+
+            local body = ngx.req.get_body_data()
+            if not body or #body > max_body_bytes then
+                return ngx.exec(backend)
+            end
+
+            local cjson = require "cjson.safe"
+            local short_post_log = {
+                method = ngx.req.get_method(),
+                uri = ngx.var.request_uri,
+                content_length = content_length,
+                content_type = ngx.var.http_content_type,
+                user_agent = ngx.var.http_user_agent,
+                body = body
+            }
+            ngx.log(ngx.NOTICE, "[ai.sggai.site] short POST request: ", cjson.encode(short_post_log) or body)
+
+            local payload = cjson.decode(body)
+            if type(payload) ~= "table" or payload.stream ~= false then
+                return ngx.exec(backend)
+            end
+
+            if type(payload.messages) ~= "table" then
+                return ngx.exec(backend)
+            end
+
+            local has_hi_content = false
+
+            for _, message in ipairs(payload.messages) do
+                if type(message) == "table" and message.content == "hi" then
+                    has_hi_content = true
+                    break
+                end
+            end
+
+            if not has_hi_content then
+                return ngx.exec(backend)
+            end
+
+            ngx.status = ngx.HTTP_OK
+            ngx.header["Content-Type"] = "application/json; charset=utf-8"
+            ngx.say([[{
+  "id": "chatcmpl-mock",
+  "object": "chat.completion",
+  "created": 1716030000,
+  "model": "xxx",
+  "choices": [
+    {
+      "index": 0,
+      "message": { "role": "assistant", "content": "ok" },
+      "finish_reason": "stop"
+    }
+  ],
+  "usage": { "prompt_tokens": 1, "completion_tokens": 1, "total_tokens": 2 }
+}]])
+            return ngx.exit(ngx.HTTP_OK)
+        }
+    }
+
+    location @ai_sggai_site_backend {
+        proxy_pass http://10.1.0.1:3001;
+    }
+
+    location / {
+        proxy_pass http://10.1.0.1:3001;
+    }
+}
diff --git a/conf/conf.d/ai.sggai.site.conf.back b/conf/conf.d/ai.sggai.site.conf.back
deleted file mode 100644
index 8337fe4..0000000
--- a/conf/conf.d/ai.sggai.site.conf.back
+++ /dev/null
@@ -1,149 +0,0 @@
-server {
-    listen 80;
-    # http2 on;
-    server_name ai.sggai.site;
-
-    location ^~ /.well-known/acme-challenge/ {
-        root /var/www;
-        default_type text/plain;
-        try_files $uri =404;
-    }
-
-    # 关键：允许 Session_id 这种带下划线的请求头
-    # underscores_in_headers on;
-    # ignore_invalid_headers off;
-
-    client_max_body_size 200m;
-
-    gzip off;
-    gunzip off;
-    location / {
-        proxy_pass http://10.1.0.1:3001;
-        proxy_http_version 1.1;
-
-        # 保持你原来“模拟 IP 直连”的行为
-        proxy_set_header Host $host;
-
-        # 基础请求头
-        proxy_set_header Authorization $http_authorization;
-        proxy_set_header Content-Type $http_content_type;
-        proxy_set_header Accept $http_accept;
-        proxy_set_header User-Agent $http_user_agent;
-
-        # 关键：Codex / 上游 prompt cache 相关头
-        proxy_set_header Originator $http_originator;
-        proxy_set_header Session_id $http_session_id;
-        proxy_set_header X-Codex-Beta-Features $http_x_codex_beta_features;
-        proxy_set_header X-Codex-Turn-Metadata $http_x_codex_turn_metadata;
-
-        # Claude CLI 相关头，保留无害
-        proxy_set_header X-Stainless-Arch $http_x_stainless_arch;
-        proxy_set_header X-Stainless-Lang $http_x_stainless_lang;
-        proxy_set_header X-Stainless-Os $http_x_stainless_os;
-        proxy_set_header X-Stainless-Package-Version $http_x_stainless_package_version;
-        proxy_set_header X-Stainless-Retry-Count $http_x_stainless_retry_count;
-        proxy_set_header X-Stainless-Runtime $http_x_stainless_runtime;
-        proxy_set_header X-Stainless-Runtime-Version $http_x_stainless_runtime_version;
-        proxy_set_header X-Stainless-Timeout $http_x_stainless_timeout;
-        proxy_set_header X-App $http_x_app;
-        proxy_set_header Anthropic-Beta $http_anthropic_beta;
-        proxy_set_header Anthropic-Dangerous-Direct-Browser-Access $http_anthropic_dangerous_direct_browser_access;
-        proxy_set_header Anthropic-Version $http_anthropic_version;
-
-        # 禁用压缩干扰
-        proxy_set_header Accept-Encoding "";
-
-        # 继续模拟直连，不暴露外层代理链
-        proxy_set_header X-Real-IP "";
-        proxy_set_header X-Forwarded-For "";
-        proxy_set_header X-Forwarded-Proto "";
-        proxy_set_header X-Forwarded-Host "";
-        proxy_set_header X-Forwarded-Port "";
-
-        proxy_set_header Connection "";
-
-        # SSE / 流式响应
-        proxy_buffering off;
-        proxy_request_buffering off;
-        proxy_cache off;
-        proxy_cache_bypass 1;
-
-        proxy_connect_timeout 600s;
-        proxy_read_timeout 3600s;
-        proxy_send_timeout 3600s;
-    }
-}
-server {
-    listen 443 ssl;
-    # http2 on;
-
-    server_name ai.sggai.site;
-
-    ssl_certificate /etc/letsencrypt/live/ai.sggai.site/fullchain.pem;
-    ssl_certificate_key /etc/letsencrypt/live/ai.sggai.site/privkey.pem;
-
-    # 关键：允许 Session_id 这种带下划线的请求头  http2 on 和下面这2个加上就容易出 status_code=400, Invalid 'prompt_cache_key': string too long. Expected a string with maximum length 64, but got a string with length 74 instead.
-    # underscores_in_headers on;
-    # ignore_invalid_headers off;
-
-    client_max_body_size 200m;
-
-    gzip off;
-    gunzip off;
-
-    location / {
-        proxy_pass http://10.1.0.1:3001;
-        proxy_http_version 1.1;
-
-        # 保持你原来“模拟 IP 直连”的行为
-        proxy_set_header Host $host;
-
-        # 基础请求头
-        proxy_set_header Authorization $http_authorization;
-        proxy_set_header Content-Type $http_content_type;
-        proxy_set_header Accept $http_accept;
-        proxy_set_header User-Agent $http_user_agent;
-
-        # 关键：Codex / 上游 prompt cache 相关头
-        proxy_set_header Originator $http_originator;
-        proxy_set_header Session_id $http_session_id;
-        proxy_set_header X-Codex-Beta-Features $http_x_codex_beta_features;
-        proxy_set_header X-Codex-Turn-Metadata $http_x_codex_turn_metadata;
-
-        # Claude CLI 相关头，保留无害
-        proxy_set_header X-Stainless-Arch $http_x_stainless_arch;
-        proxy_set_header X-Stainless-Lang $http_x_stainless_lang;
-        proxy_set_header X-Stainless-Os $http_x_stainless_os;
-        proxy_set_header X-Stainless-Package-Version $http_x_stainless_package_version;
-        proxy_set_header X-Stainless-Retry-Count $http_x_stainless_retry_count;
-        proxy_set_header X-Stainless-Runtime $http_x_stainless_runtime;
-        proxy_set_header X-Stainless-Runtime-Version $http_x_stainless_runtime_version;
-        proxy_set_header X-Stainless-Timeout $http_x_stainless_timeout;
-        proxy_set_header X-App $http_x_app;
-        proxy_set_header Anthropic-Beta $http_anthropic_beta;
-        proxy_set_header Anthropic-Dangerous-Direct-Browser-Access $http_anthropic_dangerous_direct_browser_access;
-        proxy_set_header Anthropic-Version $http_anthropic_version;
-
-        # 禁用压缩干扰
-        proxy_set_header Accept-Encoding "";
-
-        # 继续模拟直连，不暴露外层代理链
-        proxy_set_header X-Real-IP "";
-        proxy_set_header X-Forwarded-For "";
-        proxy_set_header X-Forwarded-Proto "";
-        proxy_set_header X-Forwarded-Host "";
-        proxy_set_header X-Forwarded-Port "";
-
-        proxy_set_header Connection "";
-
-        # SSE / 流式响应
-        proxy_buffering off;
-        proxy_request_buffering off;
-        proxy_cache off;
-        proxy_cache_bypass 1;
-
-        proxy_connect_timeout 600s;
-        proxy_read_timeout 3600s;
-        proxy_send_timeout 3600s;
-    }
-}