started -> true onStarted connecting -> true in Java

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started -> true onStarted connecting -> true
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Here and in the examples that follow, we do not show output that results from initialization of the HttpRequest object
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onConnecting exception -> javanetUnknownHostException: nosuchurl onException: javanetUnknownHostException: nosuchurl done -> true onDone
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Figure 27-2
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Output from an HttpRequest
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As you can see, the request begins by notifying that it has started and is attempting to make a connection to the server Because the URL is invalid, the attempt fails, and this results in an UnknownHostException being written to the exception variable of the HttpRequest, and the onException callback function is then calledAs this terminates processing of the request, the done variable is set to true, and the onDone callback is called A GET Request to a URL with an Unknown Protocol Using an unknown protocol results in an event shorter interaction than the one you have just seen Here s the result of attempting to connect to the URL xyzzy://nosuchurl:
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started -> true onStarted exception -> javanetMalformedURLException: unknown protocol: xyzzy onException: javanetMalformedURLException: unknown protocol: xyzzy done -> true onDone
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Because the protocol part of the URL is not recognized, no connection handler class is found, so this request doesn t even get as far as attempting a connection Instead, an exception is reported A GET Request to a Valid HTTP URL For our next example, we type the URL http://javasuncom into the input field and click the Go button Because this is a valid URL, the resulting output shows the complete lifecycle for an HTTP GET request:
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 started -> true onStarted connecting -> true onConnecting doneConnect -> true onDoneConnect readingHeaders -> true onReadingHeaders responseCode -> 200 onResponseCode: 200 responseMessage -> OK onResponseMessage: OK onResponseHeaders : HTTP/11 200 OK server: Sun-Java-System-Web-Server/70 date: Sun, 26 Apr 2009 14:03:31 GMT content-type: text/html;charset=ISO-8859-1 set-cookie: JSESSIONID=B6E70BFD3EA616ADA7C7BDB4E2F129E5; Path=/ connection: close doneHeaders -> true onDoneHeaders reading -> true onReading toread -> -1 onToRead, length = -1 read -> 4156 onRead: 4156 bytes read -> 5616 onRead: 5616 bytes read -> 7076 onRead: 7076 bytes read -> 10828 onRead: 10828 bytes read -> 14580 onRead: 14580 bytes read -> 18332 onRead: 18332 bytes read -> 22084
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39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56
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onRead: 22084 bytes read -> 25836 onRead: 25836 bytes read -> 29588 onRead: 29588 bytes read -> 33340 onRead: 33340 bytes read -> 37092 onRead: 37092 bytes read -> 40844 onRead: 40844 bytes read -> 45236 onRead: 45236 bytes doneRead -> true onDoneRead Read a total of 45236 bytes done -> true onDone
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The first six lines show the process of successfully connecting to the web server at javasuncomAt this point, the HTTP GET request is transmitted and then the HttpRequest implementation starts reading the server s response On lines 7 to 20, the server s response and the HTTP headers are received and processedAs you can see, the start and end of this part of the exchange are clearly delineated by the onReadingHeaders call on line 8 and the onDoneHeaders call on line 20 Strictly speaking, the response code is not part of the HTTP header block, but in the HttpRequest lifecycle it is reported at the start of header processingThe server s response code is stored in the responseCode variable, and a text string that describes the response is stored in the responseMessage variableThe possible response codes and their meanings are listed in the HTTP 11 protocol specification, which you can find at http://wwww3org/Protocols/rfc2616/rfc2616html The HttpStatus class defines constants that correspond to these response codes In this case, the request was successful to the response code is 200 (which is also the value of the constant HttpStatusOK), and the response message is simply OK In some cases, you might want to check the value of the response code and take specific action, but here this is not necessary The headers themselves each have a name and an associated string valueThese are collected into a map, which is held by the HttpRequest object, and the header names are held in a sequence that is passed as an argument to the onResponseHeaders callback Here s the code in this function that prints the header names and values:
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onResponseHeaders: function(headers) { addText("onResponseHeaders"); showHeaders(headers, r) }
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