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var header3:URLRequestHeader = new URLRequestHeader("Accept", "application/xml;charset=UTF-8"); var request:URLRequest = new URLRequest("https://checkout.google.com/ api/checkout/v2/request/Merchant/MERCHANT_ID"); request.data = new URLVariables("name=value"); request.method = URLRequestMethod.GET; request.requestHeaders.push(header1); request.requestHeaders.push(header2); request.requestHeaders.push(header3); // Call load() method within a try-catch block to handle invocation time errors loader.load(request);
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With the exception of restricting a few keywords, like get/Get/GET, and not allowing a few header types, like Accept-Ranges and Allow, the URLRequestHeader class lets you set custom headers. Where custom header setting is required, URLLoader shines compared with HTTPService.
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By default and in all situations, both HTTPService and URLLoader allow the HTTP GET and POST methods. These are the two most popular methods, and so this suffices in most situations. When using a server-side proxy and specifying so by flagging useProxy="true", HTTPService is able to send HEAD, OPTIONS, PUT, TRACE, and DELETE HTTP requests as well. (If you are rusty on where and how to use these additional HTTP methods, refer to the online W3C documentation at http://www.w3.org/Protocols/ rfc2616/rfc2616-sec9.html.) URLLoader can make requests defined in the URLRequest class. The URLRequestMethod attribute can take only POST and GET as valued values. These values are defined in URLRequestMethod. This puts you in a fix. You can t do header manipulation in GET calls with HTTPService, and you can t make any HTTP method calls other than POST and GET in URLLoader. If you needed both simultaneously, you have to look outside of these two options. The last option is writing things from the ground up on top of the Socket class, which is what we ll do in the next section. For now, let s look at another issue related to HTTP methods. WebDAV is an open, community driven standard to extend HTTP for web authoring, while keeping things interoperable. To quote a line about its goals from the WebDAV charter: define the HTTP extensions necessary to enable distributed web authoring tools to be broadly interoperable, while supporting user needs. Information about WebDAV is available at http://www.webdav.org/. WebDAV defines some additional HTTP methods:
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PROPFIND retrieves properties (stored as XML) from a resource. PROPPATCH modifies multiple properties of a resource at the same time (in a single transaction). MKCOL creates directory-like collections. COPY copies a resource between URI(s). MOVE moves a resource between URI(s). LOCK locks (shared or exclusive) a resource. UNLOCK unlocks a resource.
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Neither HTTPService nor URLLoader (with URLRequest) allows HTTP method extensions and definition of new ones. Thus they offer no support for WebDAV at the time of writing. You ve seen HTTPService and URLLoader; now let s see how to use the Socket class. In this day and age, spending time on low-level details is typically shunned in the software development world. In that sense, Socket is surely the bad guy in town!
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AS3 defines two types of sockets, one that can be used to transmit XML data and another that can send binary data. You specify a host and a port, and Socket can create a connection on this host and port. The connection will stay alive until explicitly closed. Therefore, a persistent channel is opened up and the client does not need to reconnect between requests if the connection is alive. The server can also send data back to the client on this connection. Socket implements the IDataInput and IDataOutput interfaces IDataInput and IDataOutput define the different read and write methods, respectively. To get a full list of methods available to read bytes, Boolean, integer, object, float, and double types, take a look at the ASDoc (accessible through Flex 3 LiveDocs). In this manner, Socket is similar to ByteArray and URLStream. Creating and using a socket in ActionScript is no different in mechanism from creating and using a socket in almost any programming language. The Socket class acts as the socket client. That means you ll need a socket server to listen to the requests your client will make. You can write a socket server in any language you wish. The code for a simple socket server written in Groovy follows. We chose Groovy because this chapter is about integration with Java, and Groovy runs in the JVM. The obvious alternative would be to use Java itself. There s a simpleJava server example in the Flex 3 Live Docs, so re-creating that example, or a similar one, would be a waste of space. Also, we want to reinforce the idea that you can use Groovy, Jython, JRuby, or Scala instead of Java itself in the JVM. This means many Java-specific things discussed in this chapter will hold true for these other JVM languages as well.
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server = new ServerSocket(8080) while(true) { server.accept() { socket -> socket.withStreams { input, output -> w = new PrintWriter(output) w << "ActionScript Socket Client is Sending Some Through" w.flush() r = input.readLine() System.err.println "Message received by the the server socket $r" w.close() } } }
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That takes care of the server socket; now let s create the socket and send a message to the listening server socket. We could create either Socket or XMLSocket. The choice depends on the type of data transmitted. The example server socket is quite elementary and is not for reading binary data, so we ll create a simple XMLSocket instance. The code for the XMLSocket client could be as follows:
package { import flash.display.Sprite; import flash.events.*; import flash.net.XMLSocket;
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