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400 Error, Bad Request when visiting domain name, IP address loads fine

Posted July 1, 2015 54.7k views
NginxDNS

Hi,
My website has been down for 2 months, I’ve basically given up resolving this issue, I have been talking with DO support as well as posting on stackoverflow and nobody seems to be able to help me.

Setup: 1-click install of django, ubuntu, nginx

Issue: After setting up a domain, visiting that domain results in a 400 error. visiting the IP works with no problem. I purchased the domain using Google Domains and used the custom name server option and put:

ns1.digitalocean.com
ns2.digitalocean.com
ns3.digitalocean.com

In etc/nginx/sites-available/django I have:

upstream app_server { 
server 127.0.0.1:9000 fail_timeout=0; 
}

server { 
listen 80 default_server; 
listen [::]:80 default_server ipv6only=on;

root /usr/share/nginx/html; 
index index.html index.htm;

client_max_body_size 4G; 
server_name cannablr.com www.cannablr.com;

keepalive_timeout 5;

# Your Django project's media files - amend as required 
location /media { 
alias /home/django/django/dealr/dealr/media; 
}

# your Django project's static files - amend as required 
location /static { 
alias /home/django/django/dealr/dealr/static; 
} 

location /favicon.ico { 
alias /home/django/django/dealr/favicon.ico; 
}

location / { 
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 
proxy_set_header Host $http_host; 
proxy_redirect off; 
proxy_pass http://app_server; 
} 
}


I have this file symlinked inside etc/nginx/sites-enabled.

Another thing that may be worth noting is even though I get a 400 error when visiting the domain, it still loads the favicon.

Any ideas or help would be appreciated.
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2 comments
  • JonsJava July 1, 2015
    Reply Report

    OK, I think I’ve confirmed what I was hinting at.

    here’s the headers when I curl by domain:

    user@host:~# curl -v cannablr.com
* About to connect() to cannablr.com port 80 (#0)
*   Trying 104.236.191.114... connected
* Connected to cannablr.com (104.236.191.114) port 80 (#0)
> GET / HTTP/1.1
> User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.16.2.3 Basic ECC zlib/1.2.3 libidn/1.18 libssh2/1.4.2
> Host: cannablr.com
> Accept: */*
>
< HTTP/1.1 400 BAD REQUEST
< Server: nginx/1.4.6 (Ubuntu)
< Date: Wed, 01 Jul 2015 18:41:32 GMT
< Content-Type: text/html
< Transfer-Encoding: chunked
< Connection: keep-alive
<
* Connection #0 to host cannablr.com left intact
* Closing connection #0
<h1>Bad Request (400)</h1>

    Now, when I go by IP:

     curl -v 104.236.191.114
* About to connect() to 104.236.191.114 port 80 (#0)
*   Trying 104.236.191.114... connected
* Connected to 104.236.191.114 (104.236.191.114) port 80 (#0)
> GET / HTTP/1.1
> User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.16.2.3 Basic ECC zlib/1.2.3 libidn/1.18 libssh2/1.4.2
> Host: 104.236.191.114
> Accept: */*
>
< HTTP/1.1 200 OK
< Server: nginx/1.4.6 (Ubuntu)
< Date: Wed, 01 Jul 2015 18:41:47 GMT
< Content-Type: text/html; charset=utf-8
< Transfer-Encoding: chunked
< Connection: keep-alive
< Vary: Cookie
<

    These 2 look similar, but very different when you realize the Content-Type is different and the IP-based one sets a cookie.

    The short answer is that you have 2 separate sites running on this thing.

    Let’s run this to see if my theory pans out:

    find /etc/nginx/ -type f -name "*.conf" -print0 | xargs -0 egrep '^(\s|\t)*listen 80'
  • edchapman88 December 2, 2016
    Reply Report

    Hi, did you find out the solution to this? I’m having the same problem.

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9 answers
MeghaBodke February 14, 2017

This has to do with getting ALLOWED_HOSTS correct.
ALLOWED_HOSTS: A list of strings representing the host/domain names that this Django site can serve
Ref: ALLOWED_HOSTS
Correct this in your setting file.
e.g. Django One-click app has settings location: /home/django/djangoproject/djangoproject/settings.py

  1. Add your domain to ALLOWED_HOSTS

    ALLOWED_HOSTS = ['example.com']

  2. At the end of file, one more entry exists for ALLOWED_HOSTS to allow sites to be accessed by DO ip addresses.

    # Discover our IP address
ALLOWED_HOSTS = ip_addresses()

    Change “=” operator to “+=”, so that it will append ip addresses rather than overwriting
    ALLOWED_HOSTS setting. 

    # Discover our IP address
ALLOWED_HOSTS += ip_addresses()

  3. If you don’t want your Webapp to be accessed by ip address, simply comment/remove second entry.

Reply Report
marcelomata91 January 11, 2017

I believe I may have a solution. I was experiencing the same issue. I checked my settings.py file and at the very bottom I found

ALLOWED_HOSTS = ip_addresses()

I commented it out and everything appears to be working fine.

It seems that digital ocean has added this and the ip_addressses() function to the settings.py file but I do not have a clue as to why yet.

Reply Report
jlhuynh10 June 11, 2016

You need to add your domain name to “ALLOWED_HOSTS’ inside of "settings.py” of the django project

Reply Report
astropeter42 April 14, 2017

i had the same problem but after following this instruction, ....Change “=” operator to “+=”, so that it will append ip addresses rather than overwriting ALLOWED_HOSTS setting…, its stopped overwriting as explained
…thanks alot MeghaBodke

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rodolfovaldez17 May 23, 2016

Have you found an update to this problem? I have the exact same thing happening to me now.

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arod7533 September 10, 2017

This was EXTREMELY helpful, thank you so much! Great explanation.

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davidrnewton1992 November 12, 2017

thank you !! that last line of code in the settings file that shipped with the one click install killed me.

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fsl966 June 11, 2018

This is actually helpful , i was trying for a month , thanks man :’)

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Vyachez February 10, 2019

Thanks a lot everyone - helped a lot!

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