vue 解决跨域时报错 Cannot read property ‘split’ of null

具体错误

TypeError: Cannot read property 'split' of null
    at required (C:\Users\杨韬锦\Desktop\cdwx-spring-cloud\beam-model-web\node_modules\requires-port\index.js:13:23)
    at Object.common.setupOutgoing (C:\Users\杨韬锦\Desktop\cdwx-spring-cloud\beam-model-web\node_modules\http-proxy\lib\http-proxy\common.js:101:7)
    at Array.stream (C:\Users\杨韬锦\Desktop\cdwx-spring-cloud\beam-model-web\node_modules\http-proxy\lib\http-proxy\passes\web-incoming.js:127:14)
    at ProxyServer.<anonymous> (C:\Users\杨韬锦\Desktop\cdwx-spring-cloud\beam-model-web\node_modules\http-proxy\lib\http-proxy\index.js:81:21)
    at middleware (C:\Users\杨韬锦\Desktop\cdwx-spring-cloud\beam-model-web\node_modules\http-proxy-middleware\lib\index.js:46:13)
    at handle (C:\Users\杨韬锦\Desktop\cdwx-spring-cloud\beam-model-web\node_modules\webpack-dev-server\lib\Server.js:322:18)
    at C:\Users\杨韬锦\Desktop\cdwx-spring-cloud\beam-model-web\node_modules\webpack-dev-server\lib\Server.js:330:47
    at Layer.handle_error (C:\Users\杨韬锦\Desktop\cdwx-spring-cloud\beam-model-web\node_modules\express\lib\router\layer.js:71:5)
    at trim_prefix (C:\Users\杨韬锦\Desktop\cdwx-spring-cloud\beam-model-web\node_modules\express\lib\router\index.js:315:13)
    at C:\Users\杨韬锦\Desktop\cdwx-spring-cloud\beam-model-web\node_modules\express\lib\router\index.js:284:7
    at Function.process_params (C:\Users\杨韬锦\Desktop\cdwx-spring-cloud\beam-model-web\node_modules\express\lib\router\index.js:335:12)
    at next (C:\Users\杨韬锦\Desktop\cdwx-spring-cloud\beam-model-web\node_modules\express\lib\router\index.js:275:10)
    at Layer.handle [as handle_request] (C:\Users\杨韬锦\Desktop\cdwx-spring-cloud\beam-model-web\node_modules\express\lib\router\layer.js:97:5)
    at trim_prefix (C:\Users\杨韬锦\Desktop\cdwx-spring-cloud\beam-model-web\node_modules\express\lib\router\index.js:317:13)
    at C:\Users\杨韬锦\Desktop\cdwx-spring-cloud\beam-model-web\node_modules\express\lib\router\index.js:284:7
    at Function.process_params (C:\Users\杨韬锦\Desktop\cdwx-spring-cloud\beam-model-web\node_modules\express\lib\router\index.js:335:12)

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split为null,定位到报错文件可以看到split是为了拆分出请求地址的头 ‘http’

引起报错原因
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解决
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