StringIndexOutOfBoundsException in AddResource

The method writeWithFullHeader() in AddResource throws

StringIndexOutOfBoundsException: String index out of range: -1

on the line:

writer.write(originalResponse.substring(insertPosition));

The rest of the method contains checks for insertPosition to be >= 0, therefore the line should be changed to something like:

writer.write(insertPosition > 0 ? originalResponse.substring(insertPosition) : originalResponse);