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Properties Describing the Connection
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Gets the virtual path of the current application. Indicates whether or not the user has been authenticated. Indicates if it is a local request. Indicates whether the connection is taking place over a Secure Sockets Layer (SSL) using HTTPS. Gets an object representing the Windows identity of the current user as logged at the IIS gate. Gets the virtual path of the current request. Gets additional path information for the requested resource, if any. The property returns any text that follows the URL. Gets the file system path of the current application s root directory.
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ApplicationPath IsAuthenticated IsLocal IsSecureConnection LogonUserIdentity Path PathInfo PhysicalApplicationPath
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16 The HTTP Request Context
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PhysicalPath RawUrl Url UrlReferrer
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Gets the physical file system path corresponding to the requested URL. Gets the raw URL of the current request. Gets the Uri object that represents the URL of the current request. Gets the Uri object that represents the URL from which the current request originated.
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The Uri class provides an object representation of a Uniform Resource Identifier (URI) a unique name for a resource available on the Internet. The Uri class provides easy access to the parts of the URI as well as properties and methods for checking host, loopback, ports, and DNS. The server variables set in the ServerVariables collection are decided by the run-time environment that processes the request. The information packed in the collection is, for the most part, excerpted from the HTTP worker request object; another part contains Web server specific information. The ServerVariables collection is just a friendly name/value model to expose that information.
Methods of the HttpRequest Class
Table 16-15 lists all methods exposed by the HttpRequest class.
TABLE 16-15
HttpRequest Methods
Description
Performs a binary read from the current input stream. The method lets you specify the number of bytes to read and returns an array of bytes. The method is provided for compatibility with ASP. ASP.NET applications should read from the stream associated with the InputStream property. Maps an incoming image-field form parameter to x/y coordinate values. Maps the specified virtual path to a physical path on the Web server. Saves the current request to a file disk with or without headers. This method is especially useful for debugging. Performs a quick, nonexhaustive check to find potentially dangerous input data in the request.
Method
BinaryRead
MapImageCoordinates MapPath SaveAs ValidateInput
Saving the Request to Disk
The SaveAs method lets you create a file to store the entire content of the HTTP request. Note that the storage medium can only be a disk file; no stream or writer can be used. Because ASP.NET by default isn t granted write permissions, this method causes an accessdenied exception unless you implement ad hoc measures. Granting the ASP.NET account full control over the file to be created (or over the whole folder) is one of the possible ways to
Part IV
Infrastructure of the Application
successfully use the SaveAs method. The following listing shows possible content that SaveAs writes to disk:
GET /MyApp/Samples/Ch14/Misc/TestFilter.aspx HTTP/1.1 Connection: Keep-Alive Accept: */* Accept-Encoding: gzip, deflate Accept-Language: it,en-us;q=0.5 Cookie: .ASPXANONYMOUS=AGzHqyVAyAEkAAAAO ... MWE3YZreWoYt-jkSc_RwU169brWNTIw1 Host: localhost:1066 User-Agent: ... UA-CPU: x86
If the intercepted request is a POST, you ll find posted values at the bottom of the string.
Validating Client Input
A golden rule of Web security claims that all user input is evil and should always be filtered and sanitized before use. The @Page directive has an attribute ValidateRequest that automatically blocks postbacks that contain potentially dangerous data. This feature is not the silver bullet of Web input security, but it helps detect possible problems. From a general security perspective, you re better off replacing the automatic input validation with a strong, application-specific validation layer. The automatic input validation feature ValidateRequest is enabled by default and implemented via a call to the HttpRequest s ValidationInput method. ValidateInput can be called by your code if the validation feature is not enabled. Request validation works by checking all input data against a hard-coded list of potentially dangerous data. The contents of the collections QueryString, Form, and Cookies are checked during request validation.
Summary
In this chapter, we covered some basic objects that are the foundation of ASP.NET programming: Server, Response, Request, and others. An ASP.NET application is represented by an instance of the HttpApplication class properly configured by the contents of the global.asax file. And both the HttpApplication class and the global.asax file found their space in this chapter too. While discussing the interface of the objects that generate the context of an HTTP request, we reviewed in detail some specific programming issues, such as server-side page redirection and the setup of response filters. In the next chapter, we ll discuss an important topic related to Web applications and ASP.NET state management. Fundamentally, Web applications are stateless, but ASP.NET provides various mechanisms for maintaining application state and caching pages. In ASP.NET 4, all intrinsic objects (except Cache) have been derived from a new base class to give developers better chances to be able to write testable Web pages.
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