Consuming XML Web Services in iPhone Applications : Page 2

Using SOAP 1.2

Using SOAP 1.2 is very similar to using SOAP 1.1. Here's a sample request:

POST /iptocountry.asmx HTTP/1.1
Host: www.ecubicle.net
Content-Type: application/soap+xml; charset=utf-8
Content-Length: length
<?xml version="1.0" encoding="utf-8"?>
<soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
  xmlns:soap12="http://www.w3.org/2003/05/soap-envelope">
  <soap12:Body>
    <FindCountryAsXml xmlns="http://www.ecubicle.net/webservices/">
      <V4IPAddress>string</V4IPAddress>
    </FindCountryAsXml>
  </soap12:Body>
</soap12:Envelope>

The SOAP response for SOAP 1.2 would be:

HTTP/1.1 200 OK
Content-Type: application/soap+xml; charset=utf-8
Content-Length: length
<?xml version="1.0" encoding="utf-8"?>
<soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
  xmlns:soap12="http://www.w3.org/2003/05/soap-envelope">
  <soap12:Body>
    <FindCountryAsXmlResponse 
       xmlns="http://www.ecubicle.net/webservices/">
      <FindCountryAsXmlResult>xml result</FindCountryAsXmlResult>
    </FindCountryAsXmlResponse>
  </soap12:Body>
</soap12:Envelope>

Using HTTP GET

For many web services, if you do not want to use SOAP, you can often use the simpler HTTP GET method. Here's the format to send a GET request:

GET /iptocountry.asmx/FindCountryAsXml?V4IPAddress=string HTTP/1.1
Host: www.ecubicle.net
HTTP/1.1 200 OK
Content-Type: text/xml; charset=utf-8
Content-Length: length

Take note of the following:

• The URL for the web service is http://www.ecubicle.net/iptocountry.asmx/FindCountryAsXml?V4IPAddress=string.
• The Content-Type for the request is text/xml; charset=utf-8.
• The Content-Length for the request is 0, because you don't need to send anything separately (everything gets sent through the query string).
• The HTTP method is GET.

The web service will return its result in the following format:

<?xml version="1.0"?>
xml result

Using HTTP POST

In addition to using HTTP GET, you can also use HTTP POST. Here's the format for sending the request:

POST /iptocountry.asmx/FindCountryAsXml HTTP/1.1
Host: www.ecubicle.net
Content-Type: application/x-www-form-urlencoded
Content-Length: length
V4IPAddress=string

Take note of the following:

• The URL for the web service is http://www.ecubicle.net/iptocountry.asmx/FindCountryAsXml.
• The Content-Type for the request is application/x-www-form-urlencoded.
• The Content-Length for the request is the length of V4IPAddress=string.
• The HTTP method is POST.

The web service returns the following result:

HTTP/1.1 200 OK
Content-Type: text/xml; charset=utf-8
Content-Length: length
<?xml version="1.0"?>
xml result