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Accessing Session Id and API Server URL parameters with Visualforce

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Credits to Andrew Albert

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Copy this code and paste it in your HTML 
  1. Visualforce Page
  2. <apex:page setup="true" controller="MyController" showHeader="false">
  3. <apex:form >
  4.  <apex:outputpanel id="counter">
  5.  <apex:outputText value="Click Here To Generate Session Id and Server URL" /> 
  6.  <apex:actionSupport event="onclick" action="{!doLogin}" rerender="refreshId" status="counterStatus">
  7.  <apex:param name="sessionId" assignTo="{!apiSessionId}" value="{!$Api.Session_ID}" />
  8.  <apex:param name="serverURL" assignTo="{!apiServerURL}" value="{!$Api.Partner_Server_URL_140}" /> 
  9.  </apex:actionSupport> 
  10.  </apex:outputpanel><br></br> 
  11.  <apex:outputPanel id="refreshId">
  12.  <apex:outputText value="API Session Id: {!apiSessionId}"/><br></br>
  13.  <apex:outputText value="API Server URL: {!apiServerURL}"/><br></br>
  14.  </apex:outputPanel>
  15. </apex:form> 
  16. </apex:page>
  17.  
  18.  
  19. Controller Apex Class
  20. public class MyController {
  21.  
  22.  public String apiSessionId {get;set;} 
  23.  public String apiServerURL {get;set;} 
  24.  
  25.  public PageReference doLogin(){ 
  26.   System.debug('apiSessionId: ' + apiSessionId); 
  27.   System.debug('apiServerURL: ' + apiServerURL); 
  28.   return null; 
  29.  }
  30.  
  31. }

URL: http://blog.sforce.com/sforce/2009/01/accessing-session-id-and-api-server-url-parameters-with-visualforce.html

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