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Consuming XML Web Services in iPhone Applications : Page 2

Find out the various ways you can call web services and parse responses from your iPhone applications to give your applications a huge range of data sources.


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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



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