axios 上传文件到微信公众号接口提示503错误

解决方案如下

```
import axios from 'axios'
import * as fs from 'fs'
import { HttpDelegate } from './HttpKit'
import * as FormData from 'form-data'
import * as https from 'https'
import concat = require('concat-stream')

upload(url: string, filePath: string, params?: string): Promise<any> {
    return new Promise((resolve, reject) => {
      let formData = new FormData()
      formData.append('media', fs.createReadStream(filePath))
      if (params) {
        formData.append('description', params)
      }
      formData.pipe(
        concat({ encoding: 'buffer' }, async data => {
          axios
            .post(url, data, {
              headers: {
                'Content-Type': 'multipart/form-data'
              }
            })
            .then(response => {
              if (response.status === 200) {
                resolve(JSON.stringify(response.data))
              } else {
                reject(`error code ${response.status}`)
              }
            })
            .catch(error => {
              reject(error)
            })
        })
      )
    })
  }
```

Javen/TNWX

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