Getting an image from a salesforce url using an apex controller

Question

I am trying to get an image located at https://na1.salesforce.com/servlet/servlet.FileDownload?file=00P24000002sSRUEA2 in an apex controller and it complains about authorization..Below is my code

HttpRequest req = new HttpRequest(); req. req.setEndpoint('https://na1.salesforce.com/servlet/servlet.FileDownload?file=00P24000002sSRUEA2'); 
req.setMethod('GET');
 Http binding = new Http(); 
HttpResponse res = binding.send(req); 
Blob image = res.getBodyAsBlob(); 
System.debug('image' + EncodingUtil.base64Encode(image));

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i am new to apex.how do i do this right

Answer 1

if your image is in same org then just query the attachment record and use the body.

attachment acc = [select id,body from attachment where id = '00P24000002sSRUEA2' LIMIT 1] //id hardcode is not a good option you have to be double sure that you need this or store this in custom setting

then use

String strImage = 'data:image/png;base64,'+EncodingUtil.base64Encode(acc.body);  

but if this is a single image or you need to display it somewhere else then store this in Static Resource, make it public and use the static resource.

{!URLFOR($Resource.file,'0.jpg')}

Answer 2

What's the error message?

If the image lives in another org to the one you're in, you might be getting hit with a CORS (cross origin resource sharing) error.