java出现400错误 HTTP 400错误请求错误

我试图发布一个XML文件(test1.xml)并从webservice API接收输出 . 我收到错误 HTTP/1.1 400 Bad Request . 这是下面的代码 .

myheader=c(Connection="close",

'Content-Type' = "application/xml",

'Content-length' =nchar("test1.xml"))

data = getURL("http://abcd/efg/requests/",

userpwd="m12345:123456", httpauth = 1L,

postfields="test1.xml",

httpheader=myheader,

verbose=TRUE)

这是输出

* Hostname was NOT found in DNS cache

* Trying 123.456.789.123...

* Connected to rcftomdev1 (123.456.789.123) port 8086 (#0)

* Server auth using Basic with user 'm12345'

> POST /dart/requests/ HTTP/1.1

Authorization: Basic bTEzNDQ4M#$#$#$#$%5==

Host: abcd:8086

Accept: */*

Connection: close

Content-Type: application/xml

Content-length: 9

* upload completely sent off: 9 out of 9 bytes

< HTTP/1.1 400 Bad Request

< Server: Apache-Coyote/1.1

< Content-Type: text/html;charset=utf-8

< Content-Length: 968

< Date: Tue, 20 Jan 07:50:05 GMT

< Connection: close

<

* Closing connection 0

不知道我哪里出错了，需要帮忙吗？