Sending URL requests

I keep seeing large spikes in my swf trying to send a url request. But these only appear in Firefox in OSX. I haven't tested in windows. Chrome (pepper and regular) and safari both work fine.  Also see large spikes when using extrnal interface. Any ideas on how to work with these and perhaps some best practices?
Function
Total Time (ms)
Sending URL requests
84
95%
    URL request timestamp
    URL request: <some_url>
    URL request ID: 25
Function
Self Time (ms)
Total Time (ms)
                ExternalInterface.call <static> (flash.external)
0
0%
97
100%
                    ExternalInterface._evalJS <static> (flash.external)
97
100%
97
100%
-nate

Michael, thank you for your detailed answer. I accept your suggestion about the issue related to sandbox api in IE9. Reducing concurent requests helped and was necessary for smooth flow of my app. However I believe this is an issue that should be targeted on flash player level not app code... I will consider filing a bug
I strongly disagree with your conclusion:
At the end of the day, if you can only make 6 or so concurrent requests at the same time, it's pointless to try and send more - either reduce the number of requests (preferably), or wait for the first batch to finish before sending some more.
http://forums.adobe.com/message/5714849#5714849 ... 92 requests
http://www.adobe.com/cz/ 117 requests
http://facebook.com 200 requests
http://maps.bing.com 100 requests in fullscreen mode when zooming, all of them concurrent ... this is basicaly what my app does

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      contentType="application/xml" />
    This is what I see in flex debugger just when the request is sent out:
    -> just before gersearchresults.send(params) call:
    params.contenttypes = "<contenttypes>
      <contenttype>AVI</contenttype>
      <contenttype>SWF</contenttype>
    </contenttypes>"
    <*** within the HTTPrequest send function, I see th following in debugger ***>
    message.contentType="application/xml"
    message.body = paramsToSend shows "<contenttypes>&lt;contenttypes&gt;
    &lt;contenttype&gt;AVI&lt;/contenttype&gt;
    &lt;contenttype&gt;SWF&lt;/contenttype&gt;
    &lt;/contenttypes&gt;</contenttypes>"
    This looks like my XML object is again formatted by an out <contenttypes> tag and the string is converted to be HTML safe (i.e. &lt, &gt notation).
    It looks like I am not doing something right with my params formation to XML and HTTPservice is reformatting it to be some form of XML (I do not know XML well either :-)
    My questions:
    1. What am I doing wrong?
    2. If there is a good example where I can send multiple parameters from flex client to php server and get data back where the request parameters will beof the form...
    <query>
    <type1>
         <type1val>value1</type1val>
         <type1val>value2</type1val>
    </type1>
    <type2>
         <type2val>value3</type2val>
         <type2val>value4</type2val>
    </type2>
    </query>
    Thanks for your help!

    Hi, I'm having a problem with a similiar issue :/
    I'm getting the error #1010 (A term is undefined and has no properties):
    at flexGraph/httpResultHandlerUserInfo()
    at flexGraph/__userInfoXML_result()
    etc.
    I removed some parts of the code so it's easier to read, if you can help me. I'm trying to populate a datagrid with info from a database, according to the alias I choose in the ComboBox. I get the error when I pick an alias from the ComboBox.
    <mx:Script>
         <![CDATA[
         import mx.collections.ArrayCollection;
         import mx.rpc.events.FaultEvent;
         import mx.rpc.events.ResultEvent;
         import mx.events.DropdownEvent;
         [Bindable] private var usersInfo:ArrayCollection;
         private function httpResultHandlerUserInfo(event:ResultEvent):void{
              usersInfo = event.result.users.user;
         private function chooseUserCB(event:DropdownEvent):void{
              userInfoXML.send();
    ]]>
    <mx:HTTPService id="userInfoXML" url="http://www.mysecondplace.org/flex/userInfo.php"
    result="httpResultHandlerUserInfo(event)"
    useProxy="false" method="POST">
    <mx:request xmlns=""><alias>{usersAliasCB.selectedItem.alias}</alias></mx:request>
    </mx:HTTPService>
    <mx:ComboBox id="usersAliasCB"
    x="10" y="10"
    labelField="alias"
    close="chooseUserCB(event)"/>
    <mx:DataGrid id="testing"
    x="10" y="100"
    dataProvider="{usersInfo}"/>
    Here's an example from the PHP file:
    $query_user = "SELECT * FROM users WHERE alias='.$_POST["alias"].'";
    Help me please

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