新建一个node服务，使用nginx-upload-module提供的upload_pass参数将处理过的请求转发到我们的node服务上面。分两步走：

1. 修改nginx配置

修改nginx配置，将nginx-upload-module存储文件的路径和文件名称塞到请求的body参数中。同时将请求转发到node服务具体配置：

    location /upload {
           upload_pass /res_upload;
            upload_store /usr/local/nginx/html;
            upload_resumable on;
            upload_state_store /tmp/state;
            upload_set_form_field "${upload_field_name}_name" $upload_file_name;
            upload_set_form_field "${upload_field_name}_content_type" $upload_content_type;
            upload_set_form_field "${upload_field_name}_path" $upload_tmp_path;

            upload_aggregate_form_field "${upload_field_name}_md5" $upload_file_md5;
            upload_aggregate_form_field "${upload_field_name}_size" $upload_file_size;
        }
        location /res_upload {
            #default_type text/html;
            #return 200 "success";
            proxy_pass http://localhost:8080;
        }

2. 新建node服务，重命名文件

1. 查看请求中的form data
2. 解析请求中的form data为json形式
3. 根据文件位置，重命名文件

4. const http = require('http');
   const fs = require('fs');
   
   http.createServer((req, res) => {
     let body = '';
     req.on('data', chunk => {
       body += chunk; // 获取form-data
     });
     req.on('end', () => {
       console.log(body);
       const params = parseForm(body); // json化参数
       rename(params.file_path, params.file_name);
       res.end('success: you can get it from: /' + params.file_name);
     })
   }).listen(8080)
   
   function parseForm(data) {
     const reg = /name="([\w_]+)"\s+(.+)\s/g;
     const params = {};
     let matched;
     while((matched = reg.exec(data))){
       params[matched[1]] = matched[2];
     }
     console.log(params);
     return params;
   }
   
   function rename(source, name){
     const path = require('path');
     const dir = path.dirname(source);
     fs.renameSync(source, path.join(dir, name));
   }

正向代理是代替用户去访问服务器
反向代理是代替服务器来响应用户
同样的技术，简单的区别，应用场景不同而已

我尝试修改STREAM_MODULES为STREAM_FILTER_MODULES，仍然不奏效，查看auto/modules脚本中，并没有stream过滤模块