curlPerform如何返回非反斜杠响应？

Question

我创建了一个soap xml请求，但是当我使用curlPerform时，它会从服务中返回反斜杠。

    headerFields =
      c(Accept = "text/xml",
        'Content-Type' = "text/xml; charset=utf-8")

    body = '<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:tem="http://tempuri.org/">
<soapenv:Header/>
<soapenv:Body>
<tem:Get>
<tem:request>
<tem:Name>
<tem:string>Name1</tem:string>
</tem:Name>
<tem:StartDate>2015-01-01T10:30:00</tem:StartDate>
<tem:EndDate>2015-01-01T10:30:00</tem:EndDate>
</tem:request>
</tem:Get>
</soapenv:Body>
</soapenv:Envelope>'

h = basicTextGatherer()
h$reset()
curlPerform(url = "service.asmx",
            httpheader = headerFields,
            postfields = body,
            writefunction = h$update
)
body <- h$value()

并以反斜杠返回； 这是回应的开始。

<?xml version=\"1.0\" encoding=\"utf-8\"?>
<soap:Envelope xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\">
<soap:Body><GetResponse xmlns=\"http://tempuri.org/\">

我试图删除反斜杠，但我没有。也许有人知道答案的来源，我就不需要删除它们。