ng2-file-upload 的内部 express 服务器返回 500 错误答案

【问题标题】：Internal express server of ng2-file-upload returns 500 errorng2-file-upload 的内部 express 服务器返回 500 错误
【发布时间】：2019-06-23 01:19:01
【问题描述】：

在ng2-file-upload 包上，当我调用uploader.uploadAll(); 时，我从ng2-file-upload 的内部快递服务器收到500 响应：

TypeError: Cannot read property 'toLowerCase' of null
    at Route._handles_method (/home/idea/Development/HisasOnline/web-app/node_modules/express/lib/router/route.js:63:21)
    at next (/home/idea/Development/HisasOnline/web-app/node_modules/express/lib/router/index.js:244:30)
    at expressInit (/home/idea/Development/HisasOnline/web-app/node_modules/express/lib/middleware/init.js:40:5)
    at Layer.handle [as handle_request] (/home/idea/Development/HisasOnline/web-app/node_modules/express/lib/router/layer.js:95:5)
    at trim_prefix (/home/idea/Development/HisasOnline/web-app/node_modules/express/lib/router/index.js:317:13)
    at /home/idea/Development/HisasOnline/web-app/node_modules/express/lib/router/index.js:284:7
    at Function.process_params (/home/idea/Development/HisasOnline/web-app/node_modules/express/lib/router/index.js:335:12)
    at next (/home/idea/Development/HisasOnline/web-app/node_modules/express/lib/router/index.js:275:10)
    at query (/home/idea/Development/HisasOnline/web-app/node_modules/express/lib/middleware/query.js:45:5)
    at Layer.handle [as handle_request] (/home/idea/Development/HisasOnline/web-app/node_modules/express/lib/router/layer.js:95:5)
    at trim_prefix (/home/idea/Development/HisasOnline/web-app/node_modules/express/lib/router/index.js:317:13)
    at /home/idea/Development/HisasOnline/web-app/node_modules/express/lib/router/index.js:284:7
    at Function.process_params (/home/idea/Development/HisasOnline/web-app/node_modules/express/lib/router/index.js:335:12)
    at next (/home/idea/Development/HisasOnline/web-app/node_modules/express/lib/router/index.js:275:10)
    at Function.handle (/home/idea/Development/HisasOnline/web-app/node_modules/express/lib/router/index.js:174:3)
    at Function.handle (/home/idea/Development/HisasOnline/web-app/node_modules/express/lib/application.js:174:10)

选项对象：

 uploadOptions: FileUploaderOptions = { url: 'https://localhost:4200/api/course/document', method: 'patch' };

【问题讨论】：

标签： angular express file-upload

【解决方案1】：

不支持 PATCH 方法，这就是您收到该错误的原因，请改用 POST

【讨论】：