WebAppService.fetchImage Method
        
 Fetched the given image based on the URL and returns it as a blob string that can be used in any img src.
 This method will add the authorization headers, if applicable, to authorize the request even when no cookie is present.
 
         
        Parameters
        
            - url
            
 
            - 
                
Type: String
The URL of the image to fetch and return as a blob string. 
        
        Return Value
        
Type: String
        
The object URL that can be used in an img tag as a blob reference.