address "'http:" not found: [Errno 11001] getaddrinfo failed.

[LancelotHolmes]

When I try the sample code of scrapy tutorial in Creating a project, Extracting data,after type

scrapy shell 'http://quotes.toscrape.com/page/1/'

I got a exception like

twisted.internet.error.DNSLookupError: DNS lookup failed: address "'http:" not found: [Errno 11001] getaddrinfo failed.

and my operating system is windows with python 2.7

[LancelotHolmes]

Well,it may be related to the quotation, I tried to use " to enclose the urls and it works, I do not know if this command differs in different OS since the original tutorial commmand code use the ' to enclose the urls.

[redapple]

That's interesting. If " is more universal, we'll update the tutorial. Thanks for reporting @LancelotHolmes

[kmike]

In unix shells ' quote disables interpolation/evaluation, unlike "; enclosing URLs in " won't keep URLs inside as-is, it only allows shell to interpret URL as a single argument.

[redapple]

so what's your suggestion @kmike ?

[kmike]

@redapple it seems quoting rules are different in cmd.exe (http://stackoverflow.com/questions/24173825/what-does-single-quote-do-in-windows-batch-files) - only double quotes are supported. It means that on Linux and OS X the right way is to use single quotes, and on Windows the right way is to use double quotes. My vote is to add a note about Windows and keep single quotes in examples.

[LancelotHolmes]

Well, I found that on Windows(10) cmd, it also works without quotation like

scrapy shell http://quotes.toscrape.com/page/1/

which got a same result as

scrapy shell "http://quotes.toscrape.com/page/1/"

[kmike]

@LancelotHolmes it works because there is nothing to escape in these URLs; these URLs work without quotes in linux as well. But in linux the example start to fail as soon as user changes URL to another URL, with GET arguments, because & has special meaning in shell. So we used quotes in tutorial to promote good practices.

It seems escaping in windows shell is more tricky; there is no equivalent for unix single quotes. According to http://ss64.com/nt/syntax-esc.html percent character still needs to be escaped, even if it is inside quotes. On the other hand, unlike bash, & char is not a problem under Windows.

[danielsjf]

You can get the same error message if the email server (Mailhog) isn't properly set up.

Request Method: | POST
-- | --
http://127.0.0.1:8000/accounts/email/
2.0.13
gaierror
[Errno 11001] getaddrinfo failed
C:\ProgramData\Anaconda3\lib\socket.py in getaddrinfo, line 748

Simply changing the backend in your settings file can solve this issue (only for local).

EMAIL_BACKEND = env('DJANGO_EMAIL_BACKEND', default='django.core.mail.backends.console.EmailBackend')