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lian360
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HTTPService.send() only works the first time

Aug 27, 2007 5:42 PM

I have the follow HTTPService defintion in my mxml page:
<mx:HTTPService
id="updateRequest"
url="{accessURL}"
useProxy="false" result="onSuccessEvent(event)" fault="onFailEvent(event)">
<mx:request>
<username>{userName}</username>
<password>{password}</password>
<id></id>
<sname></sname>
<value></value>
<randomNum>0</randomNum>
</mx:request>
</mx:HTTPService>


Here is my call:
updateRequest.request.id= myid;
updateRequest.request.sname= myname;
updateRequest.request.value = myvalue;
updateRequest.request.randomNum = Math.random();
updateRequest.send();

The first time call is successful, but second time(after 30 seconds), after send() function call, I didn't even received HTTPService call from server side. Is this somehow cached or I need to reinitial it? This looks strange.
452 Views   8 Replies   Latest reply: Tigomark, Jan 22, 2008 4:57 PM
 
Replies
  • Oceanyahoo
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    1. Oceanyahoo,
    Aug 28, 2007 11:40 PM   in reply to lian360
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    I think is browser cache related proxy. I have the same problem but i haven`t yet tested.
    So i think, at the server, you must notify the browser/flash engine not to cache the result by specifying a header on server response like "Content-Expires 0" or equivalent. The problem seems to be only in IE, not in Mozilla. Also, setting useProxy to false will not work for IE, because of course is false by default and in your code you haven`t set to true.

    Another thought: Event not specified, i supose the prefered method to pass parameters with httpservice is via send method ( send(parameters) ) because all examples i found on flex docs are based on simple object wich contain pairs name=> value and wich is pass as parameter to send method. I don`t know if there are any significant difference using mx:request or as3 equivalent as in your example. Maybe it was prefered because is so similar to Ajax requests.
     
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  • JasonBrownAA
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    2. JasonBrownAA,
    Aug 29, 2007 7:46 AM   in reply to lian360
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    I was seeing the same thing when I'd call a jsp with the same parameter list (the jsp is never re-called, and the cached results from the initial call are returned).

    you need to add

    response.setHeader("Cache-Control", "max-age=0, must-revalidate");

    to the top of your jsp. that did the trick for me
     
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  • dbanas
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    3. dbanas,
    Sep 29, 2007 6:14 AM   in reply to JasonBrownAA
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    Do you know what to put in a standard HTML response, in order to achieve the same end?

    Thanks,
    -db
     
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  • lian360
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    4. lian360,
    Dec 26, 2007 5:02 PM   in reply to lian360
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    Interesting, in my original message, I used "randomNum" to make sure each time the request has different randomNum to make parameters unique. Doesn't that make browser think it is different URL and won't cache it?
     
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  • btelintelo
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    5. btelintelo,
    Dec 27, 2007 5:26 AM   in reply to lian360
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    The random number I have found is not always that random and sometimes you will get back a cached page and not know it. Try using monthdayyearhourminutesecond and you should never get the same number.
     
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  • Mark Hartnett
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    6. Mark Hartnett,
    Dec 27, 2007 5:36 AM   in reply to lian360
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    I agree with telintel.
    We use data time and have not had a problem.

    var dt : String = new Date().toTimeString();
    this.service.url = this.service.url + "?submitDate=" + dt;
     
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  • lian360
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    7. lian360,
    Jan 21, 2008 6:11 PM   in reply to lian360
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    Thanks for the answers, I eventually found out it is the updateRequest.request.value too long, probably beyond the HTTP GET limit. That is why my request was never sent out. But surprisingly, there is no error or warning from Flex. After I use HTTP POST, everything seems working ok.

    Thanks
     
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  • Tigomark
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    8. Tigomark,
    Jan 22, 2008 4:57 PM   in reply to lian360
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    I am having the same issue but have already been using the post method. When I click my refresh button or if the timer I have set up resets I see no request made to the server.

    private function onResult(Event:ResultEvent):void {
    var myNum:int = Math.round(Math.random() * 2);
    var xmlResult:XML = XML(Event.result);
    _xlcMyListData = new XMLListCollection(xmlResult..asset);

    }

    <mx:HTTPService id="tempXML" resultFormat="e4x" result="onResult(event)" method="POST" url=" http://mysite.net/info_wrapper.php?customer={customer.text}&amp;userna me={username.text}&amp;password={password.text}" useProxy="false"/>

    <mx:TileList dataProvider="{_xlcMyListData}" labelField="fleet" left="35" right="15"
    width="350" backgroundColor="#000000" color="#ff0000" fontSize="27" borderColor="#000000" columnWidth="315" rowHeight="50" themeColor="#808080" fontWeight="bold" allowMultipleSelection="true" id="TileList1" height="0" y="202" x="178"/>

    <mx:Button label="Refresh Page Now" height="27" fillAlphas="[1.0, 1.0]" fillColors="[#030000, #030000, #474545, #474545]" borderColor="#DCDEDF" click="tempXML.send();"/>


     
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