### nginx 使用njs模块动态修改请求



##### 安装编译环境 

```bash
    #GCC
    apt install -y build-essential

    #安装正则库
    apt install -y libpcre3 libpcre3-dev

    #安装zlib库
    apt install -y zlib1g-dev

    #openssl
    apt install -y openssl libssl-dev

```



##### 下载源码

```

# 创建源码目录
mkdir -p ~/build && cd ~/build

# 下载最新稳定版 Nginx
wget https://nginx.org/download/nginx-1.24.0.tar.gz
tar -zxvf nginx-1.24.0.tar.gz

# 下载 njs 模块
wget https://github.com/nginx/njs/archive/refs/tags/0.7.11.tar.gz -O njs-0.7.11.tar.gz
tar -zxvf njs-0.7.11.tar.gz

```





##### 编译
这里采用最小化 默认配置编译

```
cd ~/build/nginx-1.24.0
```

```
./configure \
    --with-http_ssl_module \
    --with-http_v2_module \
    --with-http_realip_module \
    --with-http_gzip_static_module \
    --add-module=../njs-0.7.11/nginx

```
```
make && make install
```


##### 配置

编辑conf/nginx.conf
```


worker_processes 1;
events {

    worker_connections 1024;
}


http {

    include mime.types;
    default_type application/octet-stream;

    sendfile on;

    keepalive_timeout 65;

    include /usr/local/nginx/conf.d/*.conf;
    include /usr/local/nginx/sites-enabled/*;
}

```

 创建子配置目录

```
mkdir /usr/local/nginx/{conf.d,sites-enabled}


```
编辑子配置

```

js_import /usr/local/nginx/test.js;

server {
    listen 80;
    location / {
        root html;
        index index.html index.htm;
    }

    location /njs {
        return 200 test.version;
    }

    location /hello {
        js_content test.hello;
    }


    error_page 500 502 503 504 /50x.html;
    location = /50x.html {

        root html;
    }
}

```

编辑js 脚本
```
function hello(r) {
    r.return(200, "Hello from njs!\n");
}

export default {hello, version: "1.0.0"};
```


##### 访问测试

测试配置是否正确

```
 sbin/nginx -t  

```

启动nginx 
```
 sbin/nginx 

```

访问测试
```
[root@cdh-node-3 nginx]# curl 127.0.0.1:80/njs
test.version[root@cdh-node-3 nginx]# curl 127.0.0.1:80/hello
Hello from njs!

```