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Protocol-specific arguments
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For information about all the options available for configuring the protocol-specific arguments for an HTTP endpoint, see the SQL Server 2005 Books Online article CREATE ENDPOINT (TransactSQL). SQL Server 2005 Books Online is installed as part of SQL Server 2005. Updates for SQL Server 2005 Books Online are available for download at www.microsoft.com/technet/prodtechnol/sql/ 2005/downloads/books.mspx.
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Lesson 2: Creating a Secure HTTP Endpoint
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Perhaps the most important settings for creating a secure HTTP endpoint are in the language_specific_arguments section of the SOAP payload. We cover the key options for this configuration section later in this lesson. You use the ALTER ENDPOINT statement to add a new method to an existing endpoint, modify or drop a method from the endpoint, or change the properties of an endpoint. And you use the DROP ENDPOINT statement to drop an existing endpoint.
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Specifying Web Methods
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To make an HTTP endpoint meaningful, the SOAP payload must specify at least one Web method. Web methods simply expose stored procedures and functions as public methods that a Web service can call. In the WEBMETHOD portion of the SOAP payload s language-specific arguments, you map specific stored procedures and functions you want to expose in the endpoint as Web methods. The general format of the WEBMETHOD portion of the SOAP payload is as follows:
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[ { WEBMETHOD [ 'namespace' .] 'method_alias' ( NAME = 'database.owner.name' [ , SCHEMA = { NONE | STANDARD | DEFAULT } ] [ , FORMAT = { ALL_RESULTS | ROWSETS_ONLY | NONE} ] )
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The namespace and method_alias that you specify define the name of the Web method that is exposed on the HTTP endpoint. The name must be unique for the entire SQL Server instance. You use the NAME clause to specify the fully qualified name of the stored procedure or function that you are mapping to the Web method.
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Object security
The name of the method that is exposed on the endpoint, method_alias, should not be the same as the actual stored procedure or function name. Using a different name prevents a hacker from interrogating an HTTP endpoint for exposed methods and then using them to attempt to gain direct access to the underlying stored procedures or functions.
The SCHEMA option defines whether an inline XML Schema Definition (XSD) will be returned for a WEBMETHOD in the SOAP response. The FORMAT option controls how results are sent back in the SOAP request. You can choose to send just the result set generated or to also include the row count, along with warning and error messages.
13
Working with HTTP Endpoints
Specifying WSDL Support, Schemas, and Namespaces
Each HTTP endpoint includes a clause in the SOAP payload to specify Web Services Description Language (WSDL) support. When you specify NONE, the endpoint does not provide any WSDL support. If you specify DEFAULT, a default WSDL is returned for the endpoint.
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WSDL
A discussion of WSDL is beyond the scope of this chapter. For information about WSDL and WSDL support, see the SQL Server 2005 Books Online article Default WSDL.
As part of the SOAP payload configuration, you can define a SCHEMA for the HTTP endpoint. An HTTP endpoint has a default SCHEMA option that can be overridden by a particular WEBMETHOD, if chosen. If you specify NONE for the SCHEMA option, an inline XSD is not returned in the SOAP request. If you specify STANDARD, an inline XSD is returned along with the result set.
NOTE
Loading result sets
If you want to load a result set from the SOAP request into a DataSet object, an XSD is required.
In addition, the SOAP payload area enables you to specify an explicit namespace for an HTTP endpoint. The default namespace is the namespace for each WEBMETHOD. This option can be overridden within the WEBMETHOD definition. If you leave this option at the DEFAULT value, which is typical, or don t specify anything for it, the namespace is assumed to be http://tempuri.org.
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