Soap content length
I look at the following is a sample SOAP 1.1 request to SP server, but its does not matter.

    POST /_vti_bin/lists.asmx HTTP/1.1
    Host: 192.168.0.25
    Content-Type: text/xml; charset=utf-8
    Content-Length: length
    SOAPAction: "http://schemas.microsoft.com/sharepoint/soap/GetList"
    
    <?xml version="1.0" encoding="utf-8"?>
    <soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
      <soap:Body>
        <GetList xmlns="http://schemas.microsoft.com/sharepoint/soap/">
          <listName>string</listName>
        </GetList>
      </soap:Body>
    </soap:Envelope>

The field   *Content-Length: length* need to be replaced with actual values. What its value? Where is I can see it? Or how to calculate it value before request?
Soap content length
===

I look at the following is a sample SOAP 1.1 request to SP server, but its does not matter.

    POST /_vti_bin/lists.asmx HTTP/1.1
    Host: 192.168.0.25
    Content-Type: text/xml; charset=utf-8
    Content-Length: length
    SOAPAction: "http://schemas.microsoft.com/sharepoint/soap/GetList"
    
    <?xml version="1.0" encoding="utf-8"?>
    <soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
      <soap:Body>
        <GetList xmlns="http://schemas.microsoft.com/sharepoint/soap/">
          <listName>string</listName>
        </GetList>
      </soap:Body>
    </soap:Envelope>

The field   *Content-Length: length* need to be replaced with actual values. What its value? Where is I can see it? Or how to calculate it value before request?