Common Problems

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Common Problems

CORS issue
If you are deploying Jet Bridge behind a proxy or some webserver you can start receiving the following errors in your browser console:
Access to XMLHttpRequest at '...' from origin 'https://app.jetad.io.io' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
Normally you shouldn't have this issue as Jet Bridge automatically adds the appropriate CORS headers to all responses.
Behind Nginx
To fix CORS issue for Nginx add the following to your server config:
my-website.conf
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server {
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    listen 80;
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    ...
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​
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    location / {
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      ###################################
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      # START
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      # Add this block to your location
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      ###################################
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      proxy_hide_header 'Access-Control-Allow-Origin';
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      proxy_hide_header 'Access-Control-Allow-Methods';
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      proxy_hide_header 'Access-Control-Allow-Headers';
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      proxy_hide_header 'Access-Control-Expose-Headers';
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​
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      if ($request_method = 'OPTIONS') {
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        add_header 'Access-Control-Allow-Origin' '*' always;
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        add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, PATCH, DELETE, OPTIONS';
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        add_header 'Access-Control-Allow-Headers' 'Authorization,DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
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        add_header 'Access-Control-Max-Age' 1728000;
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        add_header 'Content-Type' 'text/plain; charset=utf-8';
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        add_header 'Content-Length' 0;
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        return 204;
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      }
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​
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      add_header 'Access-Control-Allow-Origin' '*' always;
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      add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, PATCH, DELETE, OPTIONS';
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      add_header 'Access-Control-Allow-Headers' 'Authorization,DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
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      add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';
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      ###################################
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      # END
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      ###################################
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      ...
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      proxy_pass http://webserver;
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      ...
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    }
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}
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[Python 3.4 or lower] Error when running Jet Bridge: AttributeError: parallel
This is because newer versions of Pillow Python library are incompatible with Python 3.4 or lower. Install older version to fix this error:
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pip install pillow==4.3.0
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[Python 3.4 or lower] Error when running Jet Bridge: AttributeError: 'module' object has no attribute 'module_from_spec'
This is because newer versions of dateparser Python library are incompatible with Python 3.4 or lower. Install older version to fix this error:
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pip install dateparser==0.7.1
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[Django] Fields generated by django-modeltranslation package does not displaying and saving correctly
The problem is that django-modeltranslation patches Django models so you need to load jet_django package only after django-modeltranslation has finished its patching this way in your settings.py:
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INSTALLED_APPS = (
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    ...
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    'modeltranslation',
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    'jet_django', # load after modeltranslation
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    ...
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)
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Using self-deployed HTTP proxy

Configuration

Last modified 1yr ago

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Contents

CORS issue

[Python 3.4 or lower] Error when running Jet Bridge: AttributeError: parallel

[Python 3.4 or lower] Error when running Jet Bridge: AttributeError: 'module' object has no attribute 'module_from_spec'

[Django] Fields generated by django-modeltranslation package does not displaying and saving correctly