添加：Umami 安装说明

Signed-off-by: 萌森 <qyg2297248353@163.com>

apps/umami/README.md

@@ -40,6 +40,103 @@ Umami 会自动理解带有 UTM 参数的链接，并让您根据 UTM 查看和
 >
 > 密码： umami
 
+## 反向代理
+
+> Nginx
+
+如果您的请求头中存在自定义字段，请修改：
+
+```text
+add_header Access-Control-Allow-Headers '*'
+```
+
+以下配置修复 ipv6 地址无法收集的问题：
+
+```nginx
+server {
+    ...
+    
+    add_header Content-Security-Policy 'frame-ancestors *';
+    add_header Access-Control-Allow-Origin '*';
+    add_header Access-Control-Allow-Methods 'GET, POST, OPTIONS';
+    add_header Access-Control-Allow-Headers 'x-umami-cache,DNT,X-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization';
+    if ($request_method = 'OPTIONS') {
+        return 204;
+    }
+    
+    location /api/send {
+        content_by_lua_block {
+            local cjson = require "cjson"
+
+            local function is_ipv6_address(hostname)
+                local match = hostname:match("^[%x:]+$")
+                return match ~= nil
+            end
+
+            ngx.req.read_body()
+            local data = ngx.req.get_body_data()
+
+            if data then
+                local decoded_data = cjson.decode(data)
+                local hostname = decoded_data.payload.hostname
+
+                if is_ipv6_address(hostname) then
+                    local new_hostname = "127.0.0.1"
+                    decoded_data.payload.hostname = new_hostname
+
+                    local modified_data = cjson.encode(decoded_data)
+                    ngx.req.set_body_data(modified_data)
+                end
+            end
+
+            ngx.exec("@proxy")
+        }
+    }
+    
+    location / {
+        proxy_hide_header 'Access-Control-Allow-Origin';
+        proxy_hide_header 'Content-Security-Policy';
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_pass http://127.0.0.1:3000; 
+    }
+    
+    location @proxy {
+        proxy_hide_header 'Access-Control-Allow-Origin';
+        proxy_hide_header 'Content-Security-Policy';
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_pass http://127.0.0.1:3000;
+    }
+}
+```
+
+极简配置：
+
+```nginx
+add_header Content-Security-Policy 'frame-ancestors *';
+add_header Access-Control-Allow-Origin '*';
+add_header Access-Control-Allow-Methods '*';
+add_header Access-Control-Allow-Headers '*';
+if ($request_method = 'OPTIONS') {
+    return 204;
+}
+
+location / {
+    proxy_hide_header 'Access-Control-Allow-Origin';
+    proxy_hide_header 'Content-Security-Policy';
+    proxy_set_header Host $host;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header X-Forwarded-Proto $scheme;
+    proxy_pass http://127.0.0.1:3000; 
+}
+```
+
 ---
 
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