Open URI problems with google chart


I'm using open-uri for trying to save the png generated with google charts. I need to create a pdf report with charts generated but I need to save thems in some way. the proble is that the url is:

And seems that open-uri doesn't accept pipes '|' , Can anyone help me..?

How can I save the images generated for use thems in PDFWriter.....

i have the same problem. i keep getting bad uri with the symbol ^?

anyway to make it accept this symbol?