Hi,

I need help on the following requirement as follows,

I have a visualforce page where i have a button in it , when i click the button it is calling my REST API apex class where i am passing the opportunity id and it should display

but when i click on the button i am getting the following error as follows

[{"message":"Session expired or invalid","errorCode":"INVALID_SESSION_ID"}]


Let me know what i should do to resove it , i need to display the opportunity record alone on clik of that button through rest api
 

MY VF PAGE :

<apex:page controller="getservice2">
<apex:form >
<apex:commandButton action="{!getResult}" value="REST API" id="theButton"/>
        <br/><br/>        {!myresponse}
</apex:form>
  </apex:page>

MY REST API CLASS :

@RestResource(urlMapping='/opportunity/*')
global with sharing class MyRestResource {

@HttpGet
    global static opportunity doGet() {
        RestRequest req = RestContext.request;
        RestResponse res = RestContext.response;
        //String opportunityId = req.requestURI.substring(req.requestURI.lastIndexOf('/')+1);
        opportunity result = [SELECT Id, Name,Account.name,owner.name FROM opportunity WHERE Id = '00628000004KwQ0'];
        return result;
    }

@HttpPost
global static String doPost(String name,
    String phone, String website) {
    opportunity opportunity = new opportunity();
    opportunity.Name = name;
    insert opportunity;
    return opportunity.Id;
}
}

MY APEX CLASS WHERE MY REST API CONTTOLLER IS REFERRED :

public class getservice2
{
    public String myresponse{get;set;}
    public Pagereference getResult()
    {
        HttpRequest req = new HttpRequest();
        Http http = new Http();
        req.setMethod('GET');
        String url = 'https://ap2.salesforce.com/services/apexrest/opportunity';
        req.setEndpoint(url);
        HTTPResponse resp = http.send(req);
        myresponse=resp.getBody();          

        return null;    }
}

Help me pls

Thanks in Advance