上传大文件时，Angular 7，Node JS，IIS，pm2，ERR_CONNECTION_RESET

问题描述

有人可以帮我吗？我遇到了这样的问题。当我尝试将150 + MB的大文件上传到服务器时，连接立即中断，并且出现此错误ERR_CONNECTION_RESET。仅当与发布API进行交互时，才会发生这种情况。在本地，一切正常。

在前端，我使用Angular7。选定的文件存储在FormData中，并将整个表单转移到发布请求中。这是前端代码的一部分：

     <div class="row">
        <div class="col-md-12">
          <div class="form-group required">
            <label class="col-form-label font-weight-bold">{{
              'form.upload.build' | resource
            }}</label>
            <div class="custom-file">
              <input
                type="file"
                class="custom-file-input"
                id="unityBuild"
                (change)="onFileChange($event,'unityBuild')"
                accept="zip,application/octet-stream,application/zip,application/x-zip,application/x-zip-compressed"
              />
              <label class="custom-file-label">{{ item.unityBuildpath }}</label>
            </div>
          </div>
        </div>
      </div>

this.form = this.formBuilder.group({
      title: new FormControl('',[Validators.required]),unityBuild: new FormControl(null),thumbnail: new FormControl(null),});

submit() {
    this.hasSubmitted = true;
    if (!this.form.valid) {
      return;
    }
    this.Loading = true;
    if (this.form.value.id) {
      this.update(this.form.value);
    } else {
      this.add(this.form.value);
    }
  }

API可在节点js，pm2和IIS上运行。还添加了Multer以处理大文件。 这是API的一个片段：

import 'reflect-Metadata';
import { createConnection } from 'typeorm';
import * as express from 'express';
import * as bodyParser from 'body-parser';
import routes from './routes';
import * as multer from 'multer';
import * as os from 'os';

//Connects to the Database -> then starts the express
createConnection()
  .then(async connection => {
    // Create a new express application instance
    const app = express();

    app.use(function(req,res,next) {
      //res.header('Access-Control-Allow-Origin','*');
      res.header('Access-Control-Allow-Credentials','true');
      res.header(
        'Access-Control-Allow-Methods','GET,HEAD,OPTIONS,POST,PUT,DELETE'
      );
      res.header(
        'Access-Control-Allow-Headers','Authorization,Token,Access-Control-Allow-Headers,Origin,Accept,X-Requested-With,Content-Type,Access-Control-Request-Method,Access-Control-Request-Headers'
      );
      next();
    });

    app.use('/public',express.static('public'));
    //app.use(bodyParser.json());
    app.use(express.json());
    app.use(express.urlencoded());

    let tempDir = os.tmpdir();
    var storage = multer.diskStorage({
      destination: function(req,file,cb) {
        cb(null,tempDir);
      },filename: function(req,file.fieldname + '-' + Date.Now());
      }
    });
    let upload = multer({
      storage: storage
    });
    app.use(
      upload.fields([
        { name: 'unityBuild',maxCount: 1 },{ name: 'thumbnail',maxCount: 1 }
      ])
    );
    app.use(express.static('public'));

    //Set all routes from routes folder
    app.use('/api',routes);
    
    app.use(errorHandler);

    app.listen(process.env.PORT,() => {
      console.log(`Server started on port ${process.env.PORT}!`);
    });
  })
  .catch(error => console.log(error));

const router = Router();
router.post("/scenes",mdlwr.checkAccess,checkMultipart,new ScenesController().addScenes);

发送后，请求不会进入控制器方法。服务器上的web.config在下面添加了配置，但这并不能解决问题。

web.config Angular
<configuration>
    <system.webServer>
        <rewrite>
        <rules>
            <rule name="redirect all requests" stopProcessing="true">
                <match url="^(.*)$" ignoreCase="false" />
                <conditions logicalGrouping="MatchAll">
                    <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" pattern="" ignoreCase="false" />
                </conditions>
                <action type="Rewrite" url="index.html" appendQueryString="true" />
            </rule>
        </rules>
        </rewrite>
        <security>
            <requestfiltering>
                <requestLimits maxAllowedContentLength="4294967290" />
            </requestfiltering>
        </security>
    </system.webServer>
</configuration>

web.config API
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <rewrite>
            <rules>
                <rule name="ReverseProxyInboundRule1" stopProcessing="true">
                    <match url="(.*)" />
                    <action type="Rewrite" url="http://localhost:8080/{R:1}" />
                </rule>
            </rules>
        </rewrite>
        <security>
            <requestfiltering>
                <requestLimits maxAllowedContentLength="4294967290" />
            </requestfiltering>
        </security>
    </system.webServer>
</configuration>

解决方法

编辑

问题出在Cloudflare，API由Cloudflere代理，并导致错误。