vb.net code 128 barcode Setting Proxies in VB.NET

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Setting Proxies
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The default proxy for all WebRequest instances is configured using the System.Net.GlobalProxySelection class. The WebRequest.Proxy property enables the proxy to be set on a per-request basis, overriding the global default. The following example demonstrates the setting of a default proxy:
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Uri x_uri = new Uri("http://myproxy:8080"); GlobalProxySelection.Select = new WebProxy(x_uri);
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Request Credentials
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The System.Net.CredentialCache class stores credentials used to access Internet resources, typically applied to HTTP requests. A single cache of credentials supports authentication information for multiple Internet resources but is intended for supporting a single user. Here is an example of defining credentials:
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CredentialCache x_cache = new CredentialCache(); x_cache.Add(new Uri("http://www.microsoft.com"), "Basic", new NetworkCredential("adam", "adams_password")); x_cache.Add(new Uri("http://www.java.sun.com"), "Digest", new NetworkCredential("adam", "adams_other_password"));
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The code fragment defines two different credentials, both of which are associated with the user adam. Although account names may differ from system to system, the CredentialCache class is not intended to track different users. Credentials are associated with a request using the Credentials property, and the PreAuthenticate property controls whether the credentials are always set with a request or only in response to an authorization challenge. The WebRequest class and the concrete implementations are responsible for determining the best credential to use from the cache.
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14. Networking
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WebResponse
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Instances of WebResponse cannot be instantiated directly but are obtained when the WebRequest.GetResponse method is called. Calling GetResponse causes the WebRequest instance to send the request to the server; nothing is sent across the network until GetResponse is invoked. As with WebRequest, WebResponse provides an abstract view of a server response and does not expose protocol-specific functionality. For protocol-specific functionality, cast the WebResponse instance to an HttpWebResponse or a FileWebResponse. Table 14-5 lists the properties available in the WebResponse class.
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Table 14-5. The WebResponse Properties
Property Description Gets the content length of the data returned from the server, excluding any ContentLength headers. ContentType Gets the Multipurpose Internet Mail Extensions (MIME) content type of the data returned from the server. Gets a collection of name/value pairs that represent the headers returned by the Headers server. ResponseUri Gets the URI of the server that responded to the request.
Getting response data
WebResponse defines the GetResponseStream method, which returns a stream that is used to read the content returned by the server. See the example at the start of this section for a demonstration of reading content with the response stream.
Protocol-Specific Request and Response Classes
Two sets of protocol implementation classes are available in the .NET Framework. The HttpWebRequest and HttpWebResponse classes are responsible for the http and https URI schemes, while FileWebRequest and FileWebResponse are responsible for the file scheme. These protocol-specific classes aren't available for direct instantiation. The static Create and instance GetResponse methods in the WebRequest class always return one of the abstract base classes. If the programmer requires more specific access, the types returned from these methods can be cast to the appropriate protocol-handler class.
File protocol classes
The FileWebRequest and FileWebResponse classes service requests for the file scheme. These classes don't expose any additional information about the file that matches the request, and there is little value in casting to these types when using the request/response classes.
HTTP protocol classes
The HttpWebRequest and HttpWebResponse classes are responsible for servicing requests using the HTTP and SSL/TLS protocols, represented by the http and https URI schemes. The
14. Networking
classes extend the abstract WebRequest and WebResponse classes to expose features that are specific to the HTTP protocols and provide a lot of the functionality that is available in the java.net.URLConnection class. These classes provide many HTTP-specific features, including the following:
Selecting between versions 1.0 and 1.1 of the HTTP protocol Setting HTTP request headers Managing cookies Configuring connection persistence and request pipelining Support for automatically following redirection directives
Here's the example we used at the start of this section for downloading the Microsoft home page. This time we cast the request and response to the HTTP protocol classes:
HttpWebRequest x_req = (HttpWebRequest)WebRequest.Create("http://www.microsoft.com"); HttpWebResponse x_response = (HttpWebResponse)x_req.GetResponse(); StreamReader x_reader = new StreamReader(x_response.GetResponseStream()); String x_str; while ((x_str = x_reader.ReadLine()) != null) { Console.WriteLine(x_str); } x_reader.Close();
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