@abstractmethod
    def get_content_length(self):
Let's see the project detail page now.
dataset/ETHPy150Open Backblaze/B2_Command_Line_Tool/b2/upload_source.py/AbstractUploadSource.get_content_length--crossover with--dataset/ETHPy150Open fabric-bolt/fabric-bolt/fabric_bolt/projects/models.py/Project.get_absolute_url