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Public methods of the Web service class decorated with the WebMethod attribute can be invoked from the AJAX page. Any method is invoked using the HTTP POST verb and returns any value as a JSON object. You can change these default settings on a per-method basis by using an optional attribute ScriptMethod. In particular, through the ScriptMethod attribute you can enable HTTP GET calls and use XML instead of JSON as the serialization format. Enabling the use of the HTTP GET verb opens security holes: the service method can be invoked through a cross-site scripting attack that attaches an external script to the <script> or <img> HTML tags. These HTML elements are the sole elements allowed to access resources from outside the current domain. However, they always operate through a GET verb. This means that by keeping the HTTP GET verb disabled on your Web service method you

Part III:

prevent at the root any possible cross-site scripting attacks. More in general, my opinion is that you should have very good reasons to use the ScriptMethod attribute, anyway. Finally, deriving the Web service class from System.Web.Services.WebService is not mandatory either. If you use that class as a parent, all that you gain is that you enable the service to access ASP.NET intrinsics directly without using the HttpContext.Current object as an intermediary. Important By default, AJAX-enabled WCF services process requests for method execution

ues are AllowLeadingWhite (1), AllowTrailingWhite (2), AllowLeadingSign (4), AllowTrailingSign (8), AllowParentheses (16), AllowDecimalPoint (32), AllowThousand (64), AllowExponent (128), AllowCurrencySymbol (256), and AllowHexSpecifier (512). You can specify which portions of the strings are valid by using the OR operator on these values, or you can use some other predefined compound values, such as Any (511, allows everything), Integer (7, allows trailing sign and leading/trailing white), Number (111, like Integer but allows thousands separator and decimal point), Float (167, like Integer but allows decimal separator and exponent), and Currency (383, allows everything except exponent). The following example extracts a Double from a string and recognizes white spaces and all the supported formats:

outside the ASP.NET pipeline. Requests for ASP.NET Web services methods, conversely, are treated as standard ASP.NET requests. In other words, .asmx requests flow through the classic request life cycle whereas .svc requests are routed out of the pipeline at some point. By switching WCF services to ASP.NET compatibility mode, you ensure that .svc requests are treated identically to .asmx requests with respect to ASP.NET intrinsics, URL authorization, and impersonation. However, the ASP.NET compatibility mode for WCF services breaks the WCF ability to behave consistently across hosting environments and transports. Compatibility mode is an option only for WCF services that will always operate over HTTP and be hosted by IIS, which is just what the majority of AJAX-enabled WCF services do.

Dim dblValue As Double = Double.Parse( 1,234.56E6 dblValue is assigned the value 1234560000. , NumberStyles.Any)

Any security barrier you place around the HTTP fa ade at the network level (for example, a firewall) to filter outsiders would likely stop legitimate calls too. When all calls come from a plain Web browser and from the Internet, you need a reliable way to welcome legitimate users and reject outsiders. To do so, you have to identify a piece of information that only legitimate users can easily provide. The simplest and most effective piece of information is an authentication cookie generated by the ASP.NET Forms authentication. To protect critical services in the HTTP fa ade, you isolate in a reserved area of the site any ASP.NET pages that invoke a sensitive service method and any services to protect. After pages and services are placed in a protected area of the site, access to them requires that users go through a login page. The login page gets credentials from the user and verifies whether the user is authorized to visit the page. If all is fine, the request is authorized and an authentication cookie is generated and attached to the response. From now on, any requests the user makes to the application, including requests directed at services in the HTTP fa ade, will bring the cookie. (See Figure 20-5.)

You can be more specific about what is valid and what isn t:

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