未找到请求部分，但在 FormData 中传递并运行两次

如何解决未找到请求部分，但在 FormData 中传递并运行两次

我有一个 NodeJS/Express/Node-Fetch 堆栈，它尝试通过从浏览器分段上传的方式接收文件，然后将该请求转发给 Java Spring Boot 服务器。

我的路由片段如下。我已验证文件已上传并且 Multer 插件已保存文件。

两个问题：

1. Node/Express 中间件运行两次（我相信只有核心 (req,res,next)，而不是电子表格 FileMiddleware.single）
2. Spring boot 抱怨我没有传入必需的请求部分“文件”，但是如果您在下面看到，FormData 对象包含它。我怀疑如果我只有一个值并且 @RequestPart 注释上没有标签，它会接受它。
3. 我应该使用@RequestPart 还是@RequestParam？

NodeJS/Express 路由片段：

    app.post('/bluecost/spreadsheet/upload/*',ensureAuthenticated,function (req,next) {
            logger.debug('Route: /bluecost/*: Reached ' + req.originalUrl);
            next();
        },spreadsheetFileMiddleware.single('file'),(req,next) => {
            const url = require('url');
            var spreadsheet_host_url = url.parse(config.spreadsheet_server_host,true);
            spreadsheet_host_url.pathname = req.originalUrl.substr(0,'/bluecost/spreadsheet/upload/'.length);
            var spreadsheet_file_name = req.originalUrl.substr('/bluecost/spreadsheet/upload/'.length);
            // spreadsheet_host_url.pathname = spreadsheet_host_url.pathname.replace('/bluecost/','/');
            logger.debug('/spreadsheet-upload: Generating token based on proxyReqOpts.user=' + req.user);
            var spreadsheet_host_url_string = url.format(spreadsheet_host_url);

            logger.info(`@@Route for ${req.originalUrl} Request ${req.method} ${spreadsheet_host_url_string}`);
            var accessToken = generateToken(req.user);
            /**
             * Set bearer token based on code from Sprint-API's lua code
             */
            // req.setHeader('Authorization','Bearer ' + accessToken);
            logger.debug('Route: /bluecost: adding Authorization: Bearer ' + accessToken);
            var newHeaders = req.headers;
            newHeaders['Authorization'] = 'Bearer ' + accessToken;
            if (!(isMultipartRequest(req) && req.method === 'PUT' || req.method === 'POST')) {
                console.log('Expecting multipart file request. Content type or method does not match');
            } else {
                console.log('@@ detected multipart form');
                if (req.body && req.body.length>0) {
                    var encodedBodyBuffer = new Buffer(req.body);
                    var encodedBody = encodedBodyBuffer.toString('base64');
                    console.log('@@ MULTIPART Encoded=' + encodedBody);
                    console.log('@@ END MULTIPART');
                }
                var FormData = require('form-data');
                console.log('@@ req.file.path='+req.file.path);
                const formData = new FormData();
                const fs = require('fs');
                var testSpreadsheetStream = fs.createReadStream(req.file.path);
                formData.append('file',fs.createReadStream(req.file.path));
                formData.append('fileName',spreadsheet_file_name);
                console.log('req headers=' + JSON.stringify(req.headers));
                const options = {
                    port: spreadsheet_host_url.port,path: spreadsheet_host_url.pathname,method: req.method,headers: req.headers,body: formData,redirect: true,compress: true
                };
                const fetch = require('node-fetch');
                fetch(spreadsheet_host_url_string,options).then(r => {
                    console.log('@@ spreadsheet send reached fetch result retrieved');
                    return r.text();
                }).then(fetchText => {
                    console.log('@@ spreadsheet send reached fetch text result retrieved');
                    /*
                    // This code complains that headders can't be set after sending to client
                    res.writeHead(res.statusCode,res.headers);
                    res.send(fetchText);
                    */
                    // res.body=fetchText;
                    console.log('@@ fetchText=' + fetchText);
                    res.status(200).send(fetchText);

                    next();
                }).catch(err => { 
                    console.log('Error on spreadsheet send  ' + err);
                    next(err); 
                });
                
            }
        }
    );

Spring Boot 处理程序片段：

    @ApiOperation(      
    value = "Upload spreadsheet data file",notes = "Allows you to upload a single file with each request")   

    @PostMapping("/spreadsheet/upload/")
    public ResponseEntity<HashMap<String,Object>> uploadSpreadsheet(@RequestPart("file") MultipartFile file,@RequestPart("fileName") String filename) {

application.properties 片段是：

spring.http.multipart.enabled=true

application.properties 片段现在：

spring.servlet.multipart.enabled=true

我打开了 Fiddler 并得到了这个拦截：

POST https://localhost:8080/cost/spreadsheet/upload/SSCSpreadsheetUpload-01012020.xlsx HTTP/1.1
Host: localhost:8080
Connection: keep-alive
Content-Length: 278
sec-ch-ua: "Chromium";v="88","Google Chrome";v="88",";Not A Brand";v="99"
Accept: application/json,text/plain,*/*
sec-ch-ua-mobile: ?0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML,like Gecko) Chrome/88.0.4324.190 Safari/537.36
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryVMR7c6jhYiM41kWt
Origin: https://localhost:8080
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: https://localhost:8080/spreadsheet-upload
Accept-Encoding: gzip,deflate,br
Accept-Language: en-US,en;q=0.9
Cookie: connect.sid=s%3AjbpdjfK0T-..... 

------WebKitFormBoundaryVMR7c6jhYiM41kWt
Content-Disposition: form-data; name="file"; filename="SSCSpreadsheetUpload-01012020.xlsx"
Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

SmallFile.txt

------WebKitFormBoundaryVMR7c6jhYiM41kWt--

我将 Excel 文件的内容更改为“SmallFile.txt”，只是为了确保文件传递机制正常工作。我觉得可以安全地得出结论，它确实按预期传递了表单数据。