Missing scheme in request url

I’ve been stuck on this bug for a while, the following error message is as follows:

File “C:\Python27\lib\site-packages\scrapy-0.20.2-py2.7.egg\scrapy\http\request\__init__.py”, line 61, in _set_url

Relative URLs and trailing slashes

I’ve looked around the web for this before, and I suspect the answer is “you can’t”, but since I’ve not yet found an answer which is that definitive, I think it’s worth asking here. The closest I’ve …