node.js – NodeJS：通过Knox将纯文本上传到s3,我得到statusCode = 505？

knoxInitParams =
    'key': awsKey
    'secret': awsPrivateKey
    'bucket': bucket

client = knox.createClient knoxInitParams   

buff = new Buffer message
reqHeader = 
    'Content-Length': buff.length
    'Content-Type': 'text/plain'
    'x-amz-acl': 'private'

req = client.put '/tmp/xxx.txt',reqHeader
req.on 'response',(res) ->
    console.log res.statusCode
    console.log res.headers
    if res.statusCode is 200
        console.log reS.Url
req.on 'error',(err) ->
    console.error "S3 Error: ",err
req.end buff

编辑：
将目标更改为硬编码,如下面的回复指出导致问题.但是,我现在得到403