Ошибка 500 django

I am having a little project and am trying to set up a website using Django, Apache 2 and mod_wsgi. Everything runs fine in the Django development server, and I can also open the front page of my site using apache.

However, when I try to log in into the admin page, or use my own custom log in page, I get a Server error (500). Can anyone tell me what I am doing wrong?

settings.py:

import os

BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

SECRET_KEY = ...

DEBUG = True

ALLOWED_HOSTS = ["localhost", "192.168.0.121", "127.0.0.1"]

LOGIN_REDIRECT_URL='/account'
LOGOUT_REDIRECT_URL='/login'

INSTALLED_APPS = [
    'account.apps.AccountConfig',
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
]

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

ROOT_URLCONF = 'kraken.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [os.path.join(BASE_DIR, 'templates')]
        ,
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

WSGI_APPLICATION = 'kraken.wsgi.application'

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
    }
}

AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True

STATIC_URL = '/static/'
STATIC_ROOT = os.path.join(BASE_DIR, "static/")

000-default.conf:

<VirtualHost *:80>
    ServerAdmin webmaster@localhost
    DocumentRoot /var/www/html        
    Alias /static /home/pi/kraken/static
    Alias /favicon.ico /home/pi/kraken/static/favicon.ico
    <Directory /home/pi/kraken/static>
            Require all granted
    </Directory>

    <Directory /home/pi/kraken/kraken>
            <Files wsgi.py>
                    Require all granted
            </Files>
    </Directory>
    WSGIDaemonProcess kraken python-path=/home/pi/kraken python-home=/home/pi/.conda/envs/django
    WSGIProcessGroup kraken
    WSGIScriptAlias / /home/pi/kraken/kraken/wsgi.py

</VirtualHost>

I used chown :www-data on my database and my project folder

Источник

Здрасти. Установил Windows 2012 и поставил IIS. Сделал сайт по инструкции, и всё норм запустилось. После сделал форму и попробывал её отправить, нажимаю отправить, браузер долго грузит, секунд 50-70 и выдает ошибку 500. Почитал по этому поводу и нашел ответ, что нужно дать папке сайта все привилегии. Дал, теперь сайт не отправляет форму а сразу дает ошибку 500. Как побороть?


  • Вопрос задан

    более трёх лет назад

  • 692 просмотра

Источник

In this post, we will see How To Fix – “HTTP 500 Server Error” When Setting DEBUG = False in Django. How the error might look like in the terminal or application. You might also find this error when you upgrade your Django version and start working with the newer version.

500 server error
"GET / HTTP/1.1" 500 145
"GET / HTTP/1.1" 500 257 "-" "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.22 (KHTML, like Gecko) Chrome/25.0.1364.97 Safari/537.22"
"GET /favicon.ico HTTP/1.1" 500 257 "-" "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.22 (KHTML, like Gecko) Chrome/25.0.1364.97 Safari/537.22"
"GET /favicon.ico HTTP/1.1" 500 257 "-" "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.22 (KHTML, like Gecko) Chrome/25.0.1364.97 Safari/537.22"


if( aicp_can_see_ads() ) {

}

Coming to the error, it so happens that when you use DEBUG=TRUE, you get no error. But when you set DEBUG=FALSE, you get the error.

Let’s do some primitive checks.

Primitive Checks :

  • Is the error happening at all the urls routes (apps) of your site ?
  • Is the admin url working ?
  • Are all your Static files in place ?

Once you are done with the Primitive Checks, you can proceed ahead with the more specific checks.


if( aicp_can_see_ads() ) {

}

Check 1:

Some static files might also cause this problem  when Debug was set to False.

The server might not be able to find some of the static files.

If the statics are not collected, in such cases also this error might occur.

  • Verify your Static configs in Settings.py file and cross-check if their values are correct.
    • STATIC_URL = ‘/static/’
    • STATICFILES_DIRS =
    • STATIC_ROOT


if( aicp_can_see_ads() ) {

}

  • Check your Static File configs in Settings.py. Try using below. Sometimes whitenoise is not able to find some static imagesfiles and  throws ValueError. Try each of the below one by one and see if that solves the error. But use only one at a time for Setting.py.
STATICFILES_STORAGE = 'django.contrib.staticfiles.storage.StaticFilesStorage'
STATICFILES_STORAGE = 'whitenoise.storage.CompressedStaticFilesStorage'
STATICFILES_STORAGE = django.contrib.staticfiles.storage.StaticFilesStorage
STATICFILES_STORAGE = 'whitenoise.storage.CompressedManifestStaticFilesStorage'
STATICFILES_STORAGE = 'django.contrib.staticfiles.storage.ManifestStaticFilesStorage'
  • Do a collectstatic when you launch the server.
python manage.py collectstatic

Check 2:

Have you used ALLOWED_HOSTS in Settings.py ?

ALLOWED_HOSTS is required in Production. This setting is MUST whenever you set DEBUG=False.

Because ALLOWED_HOSTS setting validates the request’s Host header and Safeguards against any kind of host-impacting attacks.


if( aicp_can_see_ads() ) {

}

If you don’t use this , SuspiciousOperation is raised. That means when a user performs some operation, that is considered as suspicious from a security perspective e.g. tampering with a session cookie.

And if such a SuspiciousOperation exception reaches the WSGI handler level, then it is logged at the Error level.

Check 3:

Are you using the ADMINS in Settings.py ?


if( aicp_can_see_ads() ) {

}

A list of all the people who get code error notifications.

Let’s see some interesting facts first.

First thing first, your Django app can actually send email to the users listed in the ADMINS setting whenever any  an internal server error occurs (for HTTP status code of 500 or greater). That way, the ADMINS gets description of the error, complete Python traceback, details about the HTTP request that caused the error, the details of exceptions raised in the request/response cycle etc.

It is advisable to set this up by –

  • Specifying EMAIL_HOST , EMAIL_HOST_USER and EMAIL_HOST_PASSWORD, SERVER_EMAIL
  • Put the email addresses of the addressees in the ADMINS setting.
  • Refer Django settings documentation for complete list of email settings.
  • By default, Django will send email from [email protected] – modify the SERVER_EMAIL setting, for setting a different user.

Example-

ADMINS = [(‘YOU’, ‘[email protected]’),]


if( aicp_can_see_ads() ) {

}

Check 4:

You can use Sentry as a Add-on for some of the deployment e.g.


if( aicp_can_see_ads() ) {

}

  • Bitbucket Pipelines
  • GitHub Actions
  • Heroku
  • Netlify
  • Vercel

It might show more details about the error.

You can also add Sentry at the WSGI level. More details here – https://docs.sentry.io/platforms/python/guides/wsgi/


if( aicp_can_see_ads() ) {

}

Check 5:

If you are using, compress for any of your code then you need to take care of the Django compress.

Add the below line to your Settings.py file


if( aicp_can_see_ads() ) {

}

COMPRESS_ENABLED = os.environ.get('COMPRESS_ENABLED', False)

Check 6:

When you run the Django app in the Local server while using DEBUG=TRUE, check are there any Issue Reported – even though your Django app might be running fine.


if( aicp_can_see_ads() ) {

}

Such kind of “Un-noticed error” have resulted in 500 server error in many cases.

So keep a close look at the Local server errors, if any.


if( aicp_can_see_ads() ) {

}

You can try to run “python manage.py runserver” in the command line console with DEBUG=FALSE to check if you get the same error still.

Hope this helps to solve the error.

Other Interesting Reads –

  • How to Send Large Messages in Kafka ?

  • Fix Spark Error – “org.apache.spark.SparkException: Failed to get broadcast_0_piece0 of broadcast_0”

  • How to Handle Bad or Corrupt records in Apache Spark ?

  • How to use Broadcast Variable in Spark ?

  • How to log an error in Python ?

  • How to Code Custom Exception Handling in Python ?

  • How to Handle Errors and Exceptions in Python ?

  • How To Fix – “Ssl: Certificate_Verify_Failed” Error in Python ?

  • How to Send Large Messages in Kafka ?

  • Fix Spark Error – “org.apache.spark.SparkException: Failed to get broadcast_0_piece0 of broadcast_0”

  • How to Handle Bad or Corrupt records in Apache Spark ?

  • How to use Broadcast Variable in Spark ?

  • Best Practices for Dependency Problem in Spark

  • Sample Code – Spark Structured Streaming vs Spark Streaming

  • Sample Code for PySpark Cassandra Application

  • How to Enable UTF-8 in Python ?

  • How to log an error in Python ?

  • Sample Python Code To Read & Write Various File Formats (JSON, XML, CSV, Text)

  • How to Handle Errors and Exceptions in Python ?

  • How to Handle Bad or Corrupt records in Apache Spark ?

  • How To Fix – Partitions Being Revoked and Reassigned issue in Kafka ?

  • What Are The Most Important Metrics to Monitor in Kafka ?

  • How To Connect Local Python to Kafka on AWS EC2 ?

  • How to Send Large Messages in Kafka ?

  • Fix Spark Error – “org.apache.spark.SparkException: Failed to get broadcast_0_piece0 of broadcast_0”

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if( aicp_can_see_ads() ) {

}

Источник

exceptions.py

Exceptions… allow error handling to be organized cleanly in a central or high-level place within the program structure.

— Doug Hellmann, Python Exception Handling Techniques

Exception handling in REST framework views

REST framework’s views handle various exceptions, and deal with returning appropriate error responses.

The handled exceptions are:

  • Subclasses of APIException raised inside REST framework.
  • Django’s Http404 exception.
  • Django’s PermissionDenied exception.

In each case, REST framework will return a response with an appropriate status code and content-type. The body of the response will include any additional details regarding the nature of the error.

Most error responses will include a key detail in the body of the response.

For example, the following request:

DELETE http://api.example.com/foo/bar HTTP/1.1
Accept: application/json

Might receive an error response indicating that the DELETE method is not allowed on that resource:

HTTP/1.1 405 Method Not Allowed
Content-Type: application/json
Content-Length: 42

{"detail": "Method 'DELETE' not allowed."}

Validation errors are handled slightly differently, and will include the field names as the keys in the response. If the validation error was not specific to a particular field then it will use the «non_field_errors» key, or whatever string value has been set for the NON_FIELD_ERRORS_KEY setting.

An example validation error might look like this:

HTTP/1.1 400 Bad Request
Content-Type: application/json
Content-Length: 94

{"amount": ["A valid integer is required."], "description": ["This field may not be blank."]}

Custom exception handling

You can implement custom exception handling by creating a handler function that converts exceptions raised in your API views into response objects. This allows you to control the style of error responses used by your API.

The function must take a pair of arguments, the first is the exception to be handled, and the second is a dictionary containing any extra context such as the view currently being handled. The exception handler function should either return a Response object, or return None if the exception cannot be handled. If the handler returns None then the exception will be re-raised and Django will return a standard HTTP 500 ‘server error’ response.

For example, you might want to ensure that all error responses include the HTTP status code in the body of the response, like so:

HTTP/1.1 405 Method Not Allowed
Content-Type: application/json
Content-Length: 62

{"status_code": 405, "detail": "Method 'DELETE' not allowed."}

In order to alter the style of the response, you could write the following custom exception handler:

from rest_framework.views import exception_handler

def custom_exception_handler(exc, context):
    # Call REST framework's default exception handler first,
    # to get the standard error response.
    response = exception_handler(exc, context)

    # Now add the HTTP status code to the response.
    if response is not None:
        response.data['status_code'] = response.status_code

    return response

The context argument is not used by the default handler, but can be useful if the exception handler needs further information such as the view currently being handled, which can be accessed as context['view'].

The exception handler must also be configured in your settings, using the EXCEPTION_HANDLER setting key. For example:

REST_FRAMEWORK = {
    'EXCEPTION_HANDLER': 'my_project.my_app.utils.custom_exception_handler'
}

If not specified, the 'EXCEPTION_HANDLER' setting defaults to the standard exception handler provided by REST framework:

REST_FRAMEWORK = {
    'EXCEPTION_HANDLER': 'rest_framework.views.exception_handler'
}

Note that the exception handler will only be called for responses generated by raised exceptions. It will not be used for any responses returned directly by the view, such as the HTTP_400_BAD_REQUEST responses that are returned by the generic views when serializer validation fails.

API Reference

APIException

Signature: APIException()

The base class for all exceptions raised inside an APIView class or @api_view.

To provide a custom exception, subclass APIException and set the .status_code, .default_detail, and default_code attributes on the class.

For example, if your API relies on a third party service that may sometimes be unreachable, you might want to implement an exception for the «503 Service Unavailable» HTTP response code. You could do this like so:

from rest_framework.exceptions import APIException

class ServiceUnavailable(APIException):
    status_code = 503
    default_detail = 'Service temporarily unavailable, try again later.'
    default_code = 'service_unavailable'

Inspecting API exceptions

There are a number of different properties available for inspecting the status
of an API exception. You can use these to build custom exception handling
for your project.

The available attributes and methods are:

  • .detail — Return the textual description of the error.
  • .get_codes() — Return the code identifier of the error.
  • .get_full_details() — Return both the textual description and the code identifier.

In most cases the error detail will be a simple item:

>>> print(exc.detail)
You do not have permission to perform this action.
>>> print(exc.get_codes())
permission_denied
>>> print(exc.get_full_details())
{'message':'You do not have permission to perform this action.','code':'permission_denied'}

In the case of validation errors the error detail will be either a list or
dictionary of items:

>>> print(exc.detail)
{"name":"This field is required.","age":"A valid integer is required."}
>>> print(exc.get_codes())
{"name":"required","age":"invalid"}
>>> print(exc.get_full_details())
{"name":{"message":"This field is required.","code":"required"},"age":{"message":"A valid integer is required.","code":"invalid"}}

ParseError

Signature: ParseError(detail=None, code=None)

Raised if the request contains malformed data when accessing request.data.

By default this exception results in a response with the HTTP status code «400 Bad Request».

AuthenticationFailed

Signature: AuthenticationFailed(detail=None, code=None)

Raised when an incoming request includes incorrect authentication.

By default this exception results in a response with the HTTP status code «401 Unauthenticated», but it may also result in a «403 Forbidden» response, depending on the authentication scheme in use. See the authentication documentation for more details.

NotAuthenticated

Signature: NotAuthenticated(detail=None, code=None)

Raised when an unauthenticated request fails the permission checks.

By default this exception results in a response with the HTTP status code «401 Unauthenticated», but it may also result in a «403 Forbidden» response, depending on the authentication scheme in use. See the authentication documentation for more details.

PermissionDenied

Signature: PermissionDenied(detail=None, code=None)

Raised when an authenticated request fails the permission checks.

By default this exception results in a response with the HTTP status code «403 Forbidden».

NotFound

Signature: NotFound(detail=None, code=None)

Raised when a resource does not exists at the given URL. This exception is equivalent to the standard Http404 Django exception.

By default this exception results in a response with the HTTP status code «404 Not Found».

MethodNotAllowed

Signature: MethodNotAllowed(method, detail=None, code=None)

Raised when an incoming request occurs that does not map to a handler method on the view.

By default this exception results in a response with the HTTP status code «405 Method Not Allowed».

NotAcceptable

Signature: NotAcceptable(detail=None, code=None)

Raised when an incoming request occurs with an Accept header that cannot be satisfied by any of the available renderers.

By default this exception results in a response with the HTTP status code «406 Not Acceptable».

Signature: UnsupportedMediaType(media_type, detail=None, code=None)

Raised if there are no parsers that can handle the content type of the request data when accessing request.data.

By default this exception results in a response with the HTTP status code «415 Unsupported Media Type».

Throttled

Signature: Throttled(wait=None, detail=None, code=None)

Raised when an incoming request fails the throttling checks.

By default this exception results in a response with the HTTP status code «429 Too Many Requests».

ValidationError

Signature: ValidationError(detail, code=None)

The ValidationError exception is slightly different from the other APIException classes:

  • The detail argument is mandatory, not optional.
  • The detail argument may be a list or dictionary of error details, and may also be a nested data structure. By using a dictionary, you can specify field-level errors while performing object-level validation in the validate() method of a serializer. For example. raise serializers.ValidationError({'name': 'Please enter a valid name.'})
  • By convention you should import the serializers module and use a fully qualified ValidationError style, in order to differentiate it from Django’s built-in validation error. For example. raise serializers.ValidationError('This field must be an integer value.')

The ValidationError class should be used for serializer and field validation, and by validator classes. It is also raised when calling serializer.is_valid with the raise_exception keyword argument:

serializer.is_valid(raise_exception=True)

The generic views use the raise_exception=True flag, which means that you can override the style of validation error responses globally in your API. To do so, use a custom exception handler, as described above.

By default this exception results in a response with the HTTP status code «400 Bad Request».

Generic Error Views

Django REST Framework provides two error views suitable for providing generic JSON 500 Server Error and
400 Bad Request responses. (Django’s default error views provide HTML responses, which may not be appropriate for an
API-only application.)

Use these as per Django’s Customizing error views documentation.

rest_framework.exceptions.server_error

Returns a response with status code 500 and application/json content type.

Set as handler500:

handler500 = 'rest_framework.exceptions.server_error'

rest_framework.exceptions.bad_request

Returns a response with status code 400 and application/json content type.

Set as handler400:

handler400 = 'rest_framework.exceptions.bad_request'

Third party packages

The following third-party packages are also available.

DRF Standardized Errors

The drf-standardized-errors package provides an exception handler that generates the same format for all 4xx and 5xx responses. It is a drop-in replacement for the default exception handler and allows customizing the error response format without rewriting the whole exception handler. The standardized error response format is easier to document and easier to handle by API consumers.

Источник

Answer by Evangeline Romero

Mine gave a similar error trying to get the index file.,Error that appears in terminal,There was error in the address of a static file:,Asking for help, clarification, or responding to other answers.

I’ve encountered this before with Whitenoise, it’s tricky to find the cause. Assuming of course that you have no errors when DEBUG = True, try setting

WHITENOISE_AUTOREFRESH = True

Answer by Reese Harvey

However, running with DEBUG set to False means you’ll never see
errors generated by your site – everyone will instead see your public error
pages. You need to keep track of errors that occur in deployed sites, so Django
can be configured to create reports with details about those errors.,Filtering error reports
Filtering sensitive information
Custom error reports

,You may also control in a more granular way which filter to use within any
given view by setting the HttpRequest’s exception_reporter_filter
attribute:,When you’re running a public site you should always turn off the
DEBUG setting. That will make your server run much faster, and will
also prevent malicious users from seeing details of your application that can be
revealed by the error pages.

import re
IGNORABLE_404_URLS = [
    re.compile(r'.(php|cgi)$'),
    re.compile(r'^/phpmyadmin/'),
]

Answer by Elena Robles

Django returns an HTTP status code of 500, an Internal Server Error, when Django encounters runtime errors in a view, such as a syntax error or a view failing to return an object that Django expects.,Now, when an error occurs,
a stack trace, settings information, and other valuable data is provided instead of rendering an error page.
To force the appearance of the Django debugging page, add an assert False to a view and attempt to access it.,The Django Debug Toolbar is a pluggable Django app that adds debugging information
(such as settings, headers, and SQL queries.) to pages.,The Django Debug Toolbar now appears on the right side of the page
when accessed from an IP address listed in INTERNAL_IPS.

class WebFactionFixes(object):
    """Sets 'REMOTE_ADDR' based on 'HTTP_X_FORWARDED_FOR', if the latter is
    set.

    Based on http://djangosnippets.org/snippets/1706/
    """
    def process_request(self, request):
        if 'HTTP_X_FORWARDED_FOR' in request.META:
            ip = request.META['HTTP_X_FORWARDED_FOR'].split(",")[0].strip()
            request.META['REMOTE_ADDR'] = ip

Answer by Coen Stafford

When DEBUG = False, Django doesn’t work at all without a
suitable value for ALLOWED_HOSTS.,Enabling persistent database connections can result in a nice speed-up when
connecting to the database accounts for a significant part of the request
processing time.,Setting DEBUG = False disables several features that are
only useful in development. In addition, you can tune the following settings.,Consider using an error monitoring system such as Sentry before your
inbox is flooded by reports. Sentry can also aggregate logs.

import os
SECRET_KEY = os.environ['SECRET_KEY']

Answer by Ahmad Perry

The 500 status code, or «Internal Server Error,» means that the server cannot process the request for an unknown reason. Sometimes this code will appear when more specific 5xx errors are more appropriate.,There is a huge range of things .htaccess can do and it isn’t difficult to use, however, if you do not enter the syntax correctly it can result in a Server 500 Error. ,If there are too many processes in the server queue, it could exceed resources and lead to a 500 error.,To confirm whether a misconfiguration in .htaccess is the cause of the 500 Internal Server error, either remove or rename the .htaccess file temporarily and then try to reload the page.

  error_reporting = E_ALL & ~E_DEPRECATED & ~E_STRICT  ->   error_reporting = E_ALL
  display_errors = Off -> display_errors = On
  display_startup_errors = Off -> display_startup_errors = On
  error_log = errors_log

Answer by Xiomara Dyer

So what is the actual content
sent in a response besides the HTTP status when an exception from
table 2-4 is triggered ? The default for HTTP 403 (Forbidden) is a single line
HTML page that says «403
Forbidden». For 400 (Bad Request), HTTP 404 (Not
Found) and HTTP 500 (Internal Server Error), it
depends on the DEBUG value in
settings.py.,If a Django project has
DEBUG=False in settings.py: HTTP 400 (Bad Request) generates a single line HTML page that says «Bad Request (400)»; HTTP 404 (Not Found) generates a single line HTML page that says «Not Found. The requested resource was
not found on this server.»; and HTTP 500
(Internal Server Error) generates a single line HTML page that says
«Server Error (500)».,If a Django project has
DEBUG=True in settings.py: HTTP (400) (Bad Request) generates a page with the message added to BadRequest (e.g.raise BadRequest(‘Invalid hours value’)) as well as a traceback report — as illustrated in figure 2-1; HTTP 404 (Not Found) generates a page with valid urls, hinting the user on what’s available — as illustrated in figure 2-2; and HTTP 500
(Internal Server Error) generates a page with a traceaback report associated with the Exception — as illustrated in figure 2-3.,* The HTTP 304 status code indicates a ‘Not Modified’ response,
so you can’t send content in the response, it should always be
empty.

from django.core.exceptions import BadRequest

raise BadRequest

Answer by Jedidiah Foley

The function must take a pair of arguments, the first is the exception to be handled, and the second is a dictionary containing any extra context such as the view currently being handled. The exception handler function should either return a Response object, or return None if the exception cannot be handled. If the handler returns None then the exception will be re-raised and Django will return a standard HTTP 500 ‘server error’ response.,In each case, REST framework will return a response with an appropriate status code and content-type. The body of the response will include any additional details regarding the nature of the error.,Note that the exception handler will only be called for responses generated by raised exceptions. It will not be used for any responses returned directly by the view, such as the HTTP_400_BAD_REQUEST responses that are returned by the generic views when serializer validation fails.,REST framework’s views handle various exceptions, and deal with returning appropriate error responses.

For example, the following request:

DELETE http://api.example.com/foo/bar HTTP/1.1
Accept: application/json

Might receive an error response indicating that the DELETE method is not allowed on that resource:

HTTP/1.1 405 Method Not Allowed
Content-Type: application/json
Content-Length: 42

{"detail": "Method 'DELETE' not allowed."}

An example validation error might look like this:

HTTP/1.1 400 Bad Request
Content-Type: application/json
Content-Length: 94

{"amount": ["A valid integer is required."], "description": ["This field may not be blank."]}

For example, you might want to ensure that all error responses include the HTTP status code in the body of the response, like so:

HTTP/1.1 405 Method Not Allowed
Content-Type: application/json
Content-Length: 62

{"status_code": 405, "detail": "Method 'DELETE' not allowed."}

In order to alter the style of the response, you could write the following custom exception handler:

from rest_framework.views import exception_handler

def custom_exception_handler(exc, context):
    # Call REST framework's default exception handler first,
    # to get the standard error response.
    response = exception_handler(exc, context)

    # Now add the HTTP status code to the response.
    if response is not None:
        response.data['status_code'] = response.status_code

    return response

The exception handler must also be configured in your settings, using the EXCEPTION_HANDLER setting key. For example:

REST_FRAMEWORK = {
    'EXCEPTION_HANDLER': 'my_project.my_app.utils.custom_exception_handler'
}

If not specified, the 'EXCEPTION_HANDLER' setting defaults to the standard exception handler provided by REST framework:

REST_FRAMEWORK = {
    'EXCEPTION_HANDLER': 'rest_framework.views.exception_handler'
}

For example, if your API relies on a third party service that may sometimes be unreachable, you might want to implement an exception for the «503 Service Unavailable» HTTP response code. You could do this like so:

from rest_framework.exceptions import APIException

class ServiceUnavailable(APIException):
    status_code = 503
    default_detail = 'Service temporarily unavailable, try again later.'
    default_code = 'service_unavailable'

In most cases the error detail will be a simple item:

>>> print(exc.detail)
You do not have permission to perform this action.
>>> print(exc.get_codes())
permission_denied
>>> print(exc.get_full_details())
{'message':'You do not have permission to perform this action.','code':'permission_denied'}

In the case of validation errors the error detail will be either a list or
dictionary of items:

>>> print(exc.detail)
{"name":"This field is required.","age":"A valid integer is required."}
>>> print(exc.get_codes())
{"name":"required","age":"invalid"}
>>> print(exc.get_full_details())
{"name":{"message":"This field is required.","code":"required"},"age":{"message":"A valid integer is required.","code":"invalid"}}

The ValidationError class should be used for serializer and field validation, and by validator classes. It is also raised when calling serializer.is_valid with the raise_exception keyword argument:

serializer.is_valid(raise_exception=True)

Set as handler500:

handler500 = 'rest_framework.exceptions.server_error'

Set as handler400:

handler400 = 'rest_framework.exceptions.bad_request'

Answer by Mara Ross

When I set Debug=False in my django app deployed to Azure App Service I get a 500 Server Error whenever I try to navigate to any of API pages or the admin panel. The application still works fine, I have a React front end that is still connected to the API however I cannot access API pages directly. Looking at SE I found that this was a common problem for Heroku users but not for Azure and I made some adjustments to my code that unfortunately didn’t really help. I have two questions:,You may try turning it off by modifying it to DEBUG = os.environ[‘DEBUG’] and set the following in your App Settings under the configuration blade in the Azure Portal ( see if this makes any difference) ,Trending on Github: Does all Azure App Services have the same virtual IP?,Using the settings should not affect the build sequence if you are using Oryx to build the app, this also depends on app service configurations and deployment method.Based on the doc of WhiteNoise, removing the line will disable WhiteNoise module used to serve static files, performance might suffer as WhiteNoise is used to enhance static content performance on Python.

@ehoke-9432,

You may try turning it off by modifying it to DEBUG = os.environ[‘DEBUG’] and set the following in your App Settings under the configuration blade in the Azure Portal ( see if this makes any difference) 

DEBUG = os.environ[‘DEBUG’]

Answer by Shiloh Higgins

We strive for transparency and don’t collect excess data.
,from django.views.default import page_not_found,Yup, gives me internal server error. I sent a tweet to him but got no reply. Thanks tho.,Built on Forem — the open source software that powers DEV and other inclusive communities.

My views are

...
from django.shortcuts import render, render_to_response
from django.template import RequestContext

def handler404(request, exception, template_name="404.html"):
    response = render_to_response("404.html")
    response.status_code = 404
    return response

def handler500(request, exception, template_name="500.html"):
    response = render_to_response("500.html")
    response.status_code = 500
    return response

Settings.py

DEBUG = (os.environ.get('DEBUG_VALUE') == 'False')

ALLOWED_HOSTS = ['*', '127.0.0.1']

Main urls.py

handler404 = 'portfolio.views.handler500'
handler500 = 'portfolio.views.handler500'
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