react请求为什么跟了两个地址呀？

// const proxy = require('http-proxy-middleware')
const { createProxyMiddleware } = require('http-proxy-middleware');

module.exports = function (app) {
app.use(createProxyMiddleware('/api', {
target: 'http://localhost:3000/',
changeOrigin: true,
pathRewrite: {
"^/api": ""
}
}))
}
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https://blog.csdn.net/u013282737/article/details/84098499